Cassini -- Huygens - wikipedia Cassini -- Huygens Cassini -- Huygens Artist 's concept of Cassini 's orbit insertion around Saturn Mission type Cassini : Saturn orbiter Huygens : Titan lander Operator Cassini : NASA / JPL Huygens : ESA / ASI COSPAR ID 1997 - 061A SATCAT no. 25008 Website NASA ESA ASI Mission duration Final : 19 years, 335 days 13 years, 76 days at Saturn En route : 6 years, 261 days Prime mission : 3 years Extended missions : Equinox : 2 years, 62 days Solstice : 6 years, 205 days Finale : 4 months, 24 days Spacecraft properties Manufacturer Cassini : Jet Propulsion Laboratory Huygens : Alcatel Alenia Space Launch mass 5,712 kg ( 12,593 lb ) Dry mass 2,523 kg ( 5,562 lb ) Power ~ 885 watts ( BOL ) ~ 670 watts ( 2010 ) ~ 663 watts ( EOM / 2017 ) Start of mission Launch date October 15, 1997, 08 : 43 : 00 ( 1997 - 10 - 15UTC08 : 43 ) UTC Rocket Titan IV ( 401 ) B B - 33 Launch site Cape Canaveral SLC - 40 End of mission Disposal Controlled entry into Saturn Last contact September 15, 2017 11 : 55 : 39 UTC X-band telemetry 11 : 55 : 46 UTC S - band radio science Orbital parameters Reference system Kronocentric Flyby of Venus ( Gravity assist ) Closest approach April 26, 1998 Distance 283 km ( 176 mi ) Flyby of Venus ( Gravity assist ) Closest approach June 24, 1999 Distance 6,052 km ( 3,761 mi ) Flyby of Earth - Moon system ( Gravity assist ) Closest approach August 18, 1999, 03 : 28 UTC Distance 1,171 km ( 728 mi ) Flyby of 2685 Masursky ( Incidental ) Closest approach January 23, 2000 Distance 1,600,000 km ( 990,000 mi ) Flyby of Jupiter ( Gravity assist ) Closest approach December 30, 2000 Distance 9,852,924 km ( 6,122,323 mi ) Saturn orbiter Orbital insertion July 1, 2004, 02 : 48 UTC Titan lander Spacecraft component Huygens Landing date January 14, 2005 Flagship Program ← Galileo Mars Science Laboratory → The Cassini -- Huygens mission ( / kəˈsiːni ˈhɔɪɡənz / kə - SEE - nee HOY - gənz ), commonly called Cassini, was a collaboration between NASA, the European Space Agency ( ESA ), and the Italian Space Agency ( ASI ) to send a probe to study the planet Saturn and its system, including its rings and natural satellites. The Flagship - class unmanned robotic spacecraft comprised both NASA 's Cassini probe, and ESA 's Huygens lander which would be landed on Saturn 's largest moon, Titan. Cassini was the fourth space probe to visit Saturn and the first to enter its orbit. The craft were named after astronomers Giovanni Cassini and Christiaan Huygens. Launched aboard a Titan IVB / Centaur on October 15, 1997, Cassini was active in space for nearly 20 years, with 13 years spent orbiting Saturn, studying the planet and its system after entering orbit on July 1, 2004. The voyage to Saturn included flybys of Venus ( April 1998 and July 1999 ), Earth ( August 1999 ), the asteroid 2685 Masursky, and Jupiter ( December 2000 ). Its mission ended on September 15, 2017, when Cassini 's trajectory took it into Saturn 's upper atmosphere and it burned up in order to prevent any risk of contaminating Saturn 's moons, which might have offered habitable environments to stowaway terrestrial microbes on the spacecraft. The mission is widely perceived to have been successful beyond expectation. Cassini - Huygens has been described by NASA 's Planetary Science Division Director as a `` mission of firsts '', that has revolutionized human understanding of the Saturn system, including its moons and rings, and our understanding of where life might be found in the Solar System. Cassini 's original mission was planned to last for four years, from June 2004 to May 2008. The mission was extended for another two years until September 2010, branded the Cassini Equinox Mission. The mission was extended a second and final time with the Cassini Solstice Mission, lasting another seven years until September 15, 2017, on which date Cassini was de-orbited to burn up in Saturn 's upper atmosphere. The Huygens module traveled with Cassini until its separation from the probe on December 25, 2004 ; it was landed by parachute on Titan on January 14, 2005. It returned data to Earth for around 90 minutes, using the orbiter as a relay. This was the first landing ever accomplished in the outer Solar System and the first landing on a moon other than our own. At the end of its mission, the Cassini spacecraft executed the `` Grand Finale '' of its mission : a number of risky passes through the gaps between Saturn and Saturn 's inner rings. The purpose of this phase was to maximize Cassini 's scientific outcome before the spacecraft was disposed. The atmospheric entry of Cassini ended the mission, but analyses of the returned data will continue for many years. Contents 1 Overview 2 Naming 3 Objectives 3.1 Itinerary 4 History 5 Spacecraft design 6 Instruments 6.1 Summary 6.2 Description 7 Plutonium power source 8 Telemetry 9 Huygens probe 10 Selected events and discoveries 10.1 Venus and Earth fly - bys and the cruise to Jupiter 10.2 Jupiter flyby 10.3 Tests of general relativity 10.4 New moons of Saturn 10.5 Phoebe flyby 10.6 Saturn rotation 10.7 Orbiting Saturn 10.8 Titan flybys 10.9 Huygens lands on Titan 10.10 Enceladus flybys 10.11 Radio occultations of Saturn 's rings 10.12 Spokes in rings verified 10.13 Lakes of Titan 10.14 Saturn hurricane 10.15 Iapetus flyby 10.16 Mission extension 10.17 Second mission extension 10.18 Great Storm of 2010 and aftermath 10.19 Venus transit 10.20 The Day the Earth Smiled 10.21 Rhea flyby 10.22 Hyperion flyby 10.23 Dione flyby 10.24 Hexagon changes color 11 Grand Finale and destruction 11.1 Missions 12 Glossary 13 See also 14 References 15 Further reading 16 External links Overview Teams from 28 countries made up the joint team responsible for designing, building, flying and collecting data from the Cassini orbiter and Huygens probe. The mission was managed by NASA 's Jet Propulsion Laboratory in the United States, where the orbiter was assembled. Huygens was developed by the European Space Research and Technology Centre. The Centre 's prime contractor, Aérospatiale of France ( now Thales Alenia Space ), assembled the probe with equipment and instruments supplied by many European countries ( Huygens ' batteries and two scientific instruments by the United States ). The Italian Space Agency ( ASI ) provided the Cassini orbiter 's high - gain radio antenna, with the incorporation of a low - gain antenna ( to ensure telecommunications with the Earth for the entire duration of the mission ), a compact and lightweight radar, which also uses the high - gain antenna and serves as a synthetic - aperture radar, a radar altimeter, a radiometer, the radio science subsystem ( RSS ), the visible channel portion VIMS - V of VIMS spectrometer. The VIMS infrared counterpart was provided by NASA, as well as Main Electronic Assembly, which includes electronic subassemblies provided by CNES of France. On April 16, 2008, NASA announced a two - year extension of the funding for ground operations of this mission, at which point it was renamed the Cassini Equinox Mission. The round of funding was again extended in February 2010 with the Cassini Solstice Mission. Naming Huygens ' explanation for the aspects of Saturn, Systema Saturnium ( 1659 ) The mission consisted of two main elements : the ASI / NASA Cassini orbiter, named for the Italian astronomer Giovanni Domenico Cassini, discoverer of Saturn 's ring divisions and four of its satellites ; and the ESA - developed Huygens probe, named for the Dutch astronomer, mathematician and physicist Christiaan Huygens, discoverer of Titan. The mission was commonly called Saturn Orbiter Titan Probe ( SOTP ) during gestation, both as a Mariner Mark II mission and generically. Cassini - Huygens was a Flagship - class mission to the outer planets. The other planetary flagships include Galileo, Voyager, and Viking. Objectives Cassini had several objectives, including : Determining the three - dimensional structure and dynamic behavior of the rings of Saturn. Determining the composition of the satellite surfaces and the geological history of each object. Determining the nature and origin of the dark material on Iapetus 's leading hemisphere. Measuring the three - dimensional structure and dynamic behavior of the magnetosphere. Studying the dynamic behavior of Saturn 's atmosphere at cloud level. Studying the time variability of Titan 's clouds and hazes. Characterizing Titan 's surface on a regional scale. Cassini -- Huygens was launched on October 15, 1997, from Cape Canaveral Air Force Station 's Space Launch Complex 40 using a U.S. Air Force Titan IV B / Centaur rocket. The complete launcher was made up of a two - stage Titan IV booster rocket, two strap - on solid rocket motors, the Centaur upper stage, and a payload enclosure, or fairing. The total cost of this scientific exploration mission was about US $3.26 billion, including $1.4 billion for pre-launch development, $704 million for mission operations, $54 million for tracking and $422 million for the launch vehicle. The United States contributed $2.6 billion ( 80 % ), the ESA $500 million ( 15 % ), and the ASI $160 million ( 5 % ). However, these figures are from the press kit which was prepared in October 2000. They do not include inflation over the course of a very long mission, nor do they include the cost of the extended missions. The primary mission for Cassini was completed on July 30, 2008. The mission was extended to June 2010 ( Cassini Equinox Mission ). This studied the Saturn system in detail during the planet 's equinox, which happened in August 2009. On February 3, 2010, NASA announced another extension for Cassini, lasting 6 ⁄ years until 2017, ending at the time of summer solstice in Saturn 's northern hemisphere ( Cassini Solstice Mission ). The extension enabled another 155 revolutions around the planet, 54 flybys of Titan and 11 flybys of Enceladus. In 2017, an encounter with Titan changed its orbit in such a way that, at closest approach to Saturn, it was only 3,000 km above the planet 's cloudtops, below the inner edge of the D ring. This sequence of `` proximal orbits '' ended when its final encounter with Titan sent the probe into Saturn 's atmosphere to be destroyed. Itinerary Selected destinations ( ordered by size but not to scale ) Titan Earth 's Moon Rhea Iapetus Dione Tethys Enceladus Mimas Hyperion Phoebe Janus Epimetheus Prometheus Pandora Helene Atlas Pan Telesto Calypso Methone History Cassini - Huygens on the launch pad Cassini -- Huygens 's origins date to 1982, when the European Science Foundation and the American National Academy of Sciences formed a working group to investigate future cooperative missions. Two European scientists suggested a paired Saturn Orbiter and Titan Probe as a possible joint mission. In 1983, NASA 's Solar System Exploration Committee recommended the same Orbiter and Probe pair as a core NASA project. NASA and the European Space Agency ( ESA ) performed a joint study of the potential mission from 1984 to 1985. ESA continued with its own study in 1986, while the American astronaut Sally Ride, in her influential 1987 report NASA Leadership and America 's Future in Space, also examined and approved of the Cassini mission. While Ride 's report described the Saturn orbiter and probe as a NASA solo mission, in 1988 the Associate Administrator for Space Science and Applications of NASA, Len Fisk, returned to the idea of a joint NASA and ESA mission. He wrote to his counterpart at ESA, Roger Bonnet, strongly suggesting that ESA choose the Cassini mission from the three candidates at hand and promising that NASA would commit to the mission as soon as ESA did. At the time, NASA was becoming more sensitive to the strain that had developed between the American and European space programs as a result of European perceptions that NASA had not treated it like an equal during previous collaborations. NASA officials and advisers involved in promoting and planning Cassini -- Huygens attempted to correct this trend by stressing their desire to evenly share any scientific and technology benefits resulting from the mission. In part, this newfound spirit of cooperation with Europe was driven by a sense of competition with the Soviet Union, which had begun to cooperate more closely with Europe as ESA drew further away from NASA. Late in 1988, ESA chose Cassini -- Huygens as its next major mission and the following year the program received major funding in the US. The collaboration not only improved relations between the two space programs but also helped Cassini -- Huygens survive congressional budget cuts in the United States. Cassini -- Huygens came under fire politically in both 1992 and 1994, but NASA successfully persuaded the U.S. Congress that it would be unwise to halt the project after ESA had already poured funds into development because frustration on broken space exploration promises might spill over into other areas of foreign relations. The project proceeded politically smoothly after 1994, although citizens ' groups concerned about its potential environmental impact attempted to derail it through protests and lawsuits until and past its 1997 launch. Spacecraft design This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( October 2014 ) Cassini - Huygens assembly The spacecraft was planned to be the second three - axis stabilized, RTG - powered Mariner Mark II, a class of spacecraft developed for missions beyond the orbit of Mars. Cassini was developed simultaneously with the Comet Rendezvous Asteroid Flyby ( CRAF ) spacecraft, but budget cuts and project rescopings forced NASA to terminate CRAF development to save Cassini. As a result, Cassini became more specialized. The Mariner Mark II series was cancelled. Including the orbiter and probe, it has been the second - largest unmanned interplanetary spacecraft built, as well as being among the most complex. The orbiter had a mass of 2,150 kg ( 4,740 lb ), the probe 350 kg ( 770 lb ). With the launch vehicle adapter and 3,132 kg ( 6,905 lb ) of propellants at launch, the spacecraft had a mass of 5,600 kg ( 12,300 lb ). Only the two Phobos 1 and 2 spacecraft sent to Mars by the Soviet Union were larger. The Cassini spacecraft was 6.8 meters ( 22 ft ) high and 4 meters ( 13 ft ) wide. Spacecraft complexity was increased by its trajectory ( flight path ) to Saturn, and by the ambitious science at its destination. Cassini had 1,630 interconnected electronic components, 22,000 wire connections, and 14 kilometers ( 8.7 mi ) of cabling. The core control computer CPU was a redundant MIL - STD - 1750A system. The main propulsion system consisted of one prime and one backup R - 4D bipropellant rocket engine. The thrust of each engine was 490 newtons and the total spacecraft delta - v was about 2,040 meters per second. Smaller monopropellant rockets provided attitude control. Cassini was powered by 32.7 kg of plutonium - 238 -- the heat from the material 's radioactive decay was turned into electricity. Huygens was supported by Cassini during cruise, but used chemical batteries when independent. The probe contained a DVD with more than 616,400 signatures from citizens in 81 countries, collected in a public campaign. Until September 2017 the Cassini probe continued orbiting Saturn at a distance of between 8.2 and 10.2 astronomical units from the Earth. It took 68 to 84 minutes for radio signals to travel from Earth to the spacecraft, and vice versa. Thus ground controllers could not give `` real - time '' instructions for daily operations or for unexpected events. Even if response were immediate, more than two hours would have passed between the occurrence of a problem and the reception of the engineers ' response by the satellite. Instruments Titan 's surface revealed by VIMS Rhea in front of Saturn Saturn 's north polar hexagon Animated 3D model of the spacecraft Summary Instruments : Optical Remote Sensing ( `` Located on the remote sensing pallet '' ) Composite Infrared Spectrometer ( CIRS ) Imaging Science Subsystem ( ISS ) Ultraviolet Imaging Spectrograph ( UVIS ) Visible and Infrared Mapping Spectrometer ( VIMS ) Fields, Particles and Waves Cassini Plasma Spectrometer ( CAPS ) Cosmic Dust Analyzer ( CDA ) Ion and Neutral Mass Spectrometer ( INMS ) Magnetometer ( MAG ) Magnetospheric Imaging Instrument ( MIMI ) Radio and Plasma Wave Science ( RPWS ) Microwave Remote Sensing Radar Radio Science ( RSS ) Description Cassini 's instrumentation consisted of : a synthetic aperture radar mapper, a charge - coupled device imaging system, a visible / infrared mapping spectrometer, a composite infrared spectrometer, a cosmic dust analyzer, a radio and plasma wave experiment, a plasma spectrometer, an ultraviolet imaging spectrograph, a magnetospheric imaging instrument, a magnetometer and an ion / neutral mass spectrometer. Telemetry from the communications antenna and other special transmitters ( an S - band transmitter and a dual - frequency K - band system ) was also used to make observations of the atmospheres of Titan and Saturn and to measure the gravity fields of the planet and its satellites. Cassini Plasma Spectrometer ( CAPS ) The CAPS is a direct sensing instrument that measures the energy and electrical charge of particles that the instrument encounters ( the number of electrons and protons in the particle ). CAPS measured the molecules originating from Saturn 's ionosphere and also determine the configuration of Saturn 's magnetic field. CAPS also investigated plasma in these areas as well as the solar wind within Saturn 's magnetosphere. CAPS was turned off June 2011 due to an electrical short circuit that occurred in the instrument. The instrument was powered on in March 2012 ; after 78 days a second short circuit forced the instrument to be again shut down. Cosmic Dust Analyzer ( CDA ) The CDA is a direct sensing instrument that measures the size, speed, and direction of tiny dust grains near Saturn. Some of these particles are orbiting Saturn, while others may come from other star systems. The CDA on the orbiter is designed to learn more about these particles, the materials in other celestial bodies and potentially about the origins of the universe. Composite Infrared Spectrometer ( CIRS ) The CIRS is a remote sensing instrument that measures the infrared radiation coming from objects to learn about their temperatures, thermal properties, and compositions. Throughout the Cassini -- Huygens mission, the CIRS measured infrared emissions from atmospheres, rings and surfaces in the vast Saturn system. It mapped the atmosphere of Saturn in three dimensions to determine temperature and pressure profiles with altitude, gas composition, and the distribution of aerosols and clouds. It also measured thermal characteristics and the composition of satellite surfaces and rings. Ion and Neutral Mass Spectrometer ( INMS ) The INMS is a direct sensing instrument that analyzes charged particles ( like protons and heavier ions ) and neutral particles ( like atoms ) near Titan and Saturn to learn more about their atmospheres. INMS was intended also to measure the positive ion and neutral environments of Saturn 's icy satellites and rings. Imaging Science Subsystem ( ISS ) The ISS is a remote sensing instrument that captures most images in visible light, and also some infrared images and ultraviolet images. The ISS has taken hundreds of thousands of images of Saturn, its rings, and its moons. The ISS has a wide - angle camera ( WAC ) that takes pictures of large areas, and a narrow - angle camera ( NAC ) that takes pictures of small areas in fine detail. Each of these cameras uses a sensitive charge - coupled device ( CCD ) as its electromagnetic wave detector. Each CCD has a 1,024 square array of pixels, 12 μm on a side. Both cameras allow for many data collection modes, including on - chip data compression. Both cameras are fitted with spectral filters that rotate on a wheel -- to view different bands within the electromagnetic spectrum ranging from 0.2 to 1.1 μm. Dual Technique Magnetometer ( MAG ) The MAG is a direct sensing instrument that measures the strength and direction of the magnetic field around Saturn. The magnetic fields are generated partly by the molten core at Saturn 's center. Measuring the magnetic field is one of the ways to probe the core. MAG aimed to develop a three - dimensional model of Saturn 's magnetosphere, and determine the magnetic state of Titan and its atmosphere, and the icy satellites and their role in the magnetosphere of Saturn. Magnetospheric Imaging Instrument ( MIMI ) The MIMI is both a direct and remote sensing instrument that produces images and other data about the particles trapped in Saturn 's huge magnetic field, or magnetosphere. This information was used to study the overall configuration and dynamics of the magnetosphere and its interactions with the solar wind, Saturn 's atmosphere, Titan, rings, and icy satellites. MIMI includes the Ion and Neutral Camera ( INCA ), which captures and measures Energetic Neutral Atoms ( ENAs ). Radar The on - board radar is an active and passive sensing instrument that has produced maps of Titan 's surface. The active radar can send radar waves able to penetrate the thick veil of haze surrounding Titan. By measuring the send and return time of the signals it is possible to determine the height of large surface features, such as mountains and canyons. The passive radar listens for radio waves that Saturn or its moons may emit. Radio and Plasma Wave Science instrument ( RPWS ) The RPWS is a direct and remote sensing instrument that receives and measures radio signals coming from Saturn, including the radio waves given off by the interaction of the solar wind with Saturn and Titan. RPWS measures the electric and magnetic wave fields in the interplanetary medium and planetary magnetospheres. It also determines the electron density and temperature near Titan and in some regions of Saturn 's magnetosphere. RPWS studies the configuration of Saturn 's magnetic field and its relationship to Saturn Kilometric Radiation ( SKR ), as well as monitoring and mapping Saturn 's ionosphere, plasma, and lightning from Saturn 's ( and possibly Titan 's ) atmosphere. Radio Science Subsystem ( RSS ) The RSS is a remote - sensing instrument that uses radio antennas on Earth to observe the way radio signals from the spacecraft change as they are sent through objects, such as Titan 's atmosphere or Saturn 's rings, or even behind the Sun. The RSS also studies the compositions, pressures and temperatures of atmospheres and ionospheres, radial structure and particle size distribution within rings, body and system masses and the gravitational field. The instrument uses the spacecraft X-band communication link as well as S - band downlink and K - band uplink and downlink. VIMS spectra taken while looking through Titan 's atmosphere towards the Sun helps understand the atmospheres of exoplanets ( artist 's concept ; May 27, 2014 ). Ultraviolet Imaging Spectrograph ( UVIS ) The UVIS is a remote - sensing instrument that captures images of the ultraviolet light reflected off an object, such as the clouds of Saturn and / or its rings, to learn more about their structure and composition. Designed to measure ultraviolet light over wavelengths from 55.8 to 190 nm, this instrument is also a tool to help determine the composition, distribution, aerosol particle content and temperatures of their atmospheres. Unlike other types of spectrometer, this sensitive instrument can take both spectral and spatial readings. It is particularly adept at determining the composition of gases. Spatial observations take a wide - by - narrow view, only one pixel tall and 64 pixels across. The spectral dimension is 1,024 pixels per spatial pixel. Also, it can take many images that create movies of the ways in which this material is moved around by other forces. Visible and Infrared Mapping Spectrometer ( VIMS ) The VIMS is a remote sensing instrument that captures images using visible and infrared light to learn more about the composition of moon surfaces, the rings, and the atmospheres of Saturn and Titan. It is made up of two cameras in one : one used to measure visible light, the other infrared. VIMS measures reflected and emitted radiation from atmospheres, rings and surfaces over wavelengths from 350 to 5100 nm, to help determine their compositions, temperatures and structures. It also observes the sunlight and starlight that passes through the rings to learn more about their structure. Scientists used VIMS for long - term studies of cloud movement and morphology in the Saturn system, to determine Saturn 's weather patterns. Plutonium power source A Cassini RTG before installation Because of Saturn 's distance from the Sun, solar arrays were not feasible as power sources for this space probe. To generate enough power, such arrays would have been too large and too heavy. Instead, the Cassini orbiter was powered by three radioisotope thermoelectric generators ( RTGs ), which use heat from the natural decay of about 33 kg ( 73 lb ) of plutonium - 238 ( in the form of plutonium dioxide ) to generate direct current electricity via thermoelectrics. The RTGs on the Cassini mission have the same design as those used on the New Horizons, Galileo, and Ulysses space probes, and they were designed to have very long operational lifetimes. At the end of the nominal 11 - year Cassini mission, they were still able to produce 600 to 700 watts of electrical power. ( One of the spare RTGs for the Cassini mission was used to power the New Horizons mission to Pluto and the Kuiper belt, which was designed and launched later. ) A glowing - hot plutonium pellet that is the power source of the probe 's radioisotope thermoelectric generator To gain momentum while already in flight, the trajectory of the Cassini mission included several gravitational slingshot maneuvers : two fly - by passes of Venus, one more of the Earth, and then one of the planet Jupiter. The terrestrial flyby was the final instance when the probe posed any conceivable danger to human beings. The maneuver was successful, with Cassini passing by 1,171 km ( 728 mi ) above the Earth on August 18, 1999. Had there been any malfunction causing the probe to collide with the Earth, NASA 's complete environmental impact study estimated that, in the worst case ( with an acute angle of entry in which Cassini would gradually burn up ), a significant fraction of the 33 kg of plutonium - 238 inside the RTGs would have been dispersed into the Earth 's atmosphere so that up to five billion people ( i.e. almost the entire terrestrial population ) could have been exposed, causing up to an estimated 5,000 additional cancer deaths over the subsequent decades ( 0.0005 per cent, i.e. a fraction 0.000005, of a billion cancer deaths expected anyway from other causes ; the product is incorrectly calculated elsewhere as 500,000 deaths ). However, the chance of this happening were estimated to be less than one in one million. Telemetry The Cassini spacecraft was capable of transmitting in several different telemetry formats. The telemetry subsystem is perhaps the most important subsystem, because without it there could be no data return. The telemetry was developed from ground up, due to the spacecraft using a more modern set of computers than previous missions. Therefore, Cassini was the first spacecraft to adopt mini-packets to reduce the complexity of the Telemetry Dictionary, and the software development process led to the creation of a Telemetry Manager for the mission. There were around 1088 channels ( in 67 mini-packets ) assembled in the Cassini Telemetry Dictionary. Out of these 67 lower complexity mini-packets, 6 mini-packets contained the subsystem covariance and Kalman gain elements ( 161 measurements ), not used during normal mission operations. This left 947 measurements in 61 mini-packets. A total of seven telemetry maps corresponding to 7 AACS telemetry modes were constructed. These modes are : ( 1 ) Record ; ( 2 ) Nominal Cruise ; ( 3 ) Medium Slow Cruise ; ( 4 ) Slow Cruise ; ( 5 ) Orbital Ops ; ( 6 ) Av ; ( 7 ) ATE ( Attitude Estimator ) Calibration. These 7 maps cover all spacecraft telemetry modes. Huygens probe Main article : Huygens ( spacecraft ) Huygens view of Titan 's surface Same image with different data processing The Huygens probe, supplied by the European Space Agency ( ESA ) and named after the 17th century Dutch astronomer who first discovered Titan, Christiaan Huygens, scrutinized the clouds, atmosphere, and surface of Saturn 's moon Titan in its descent on January 15, 2005. It was designed to enter and brake in Titan 's atmosphere and parachute a fully instrumented robotic laboratory down to the surface. The probe system consisted of the probe itself which descended to Titan, and the probe support equipment ( PSE ) which remained attached to the orbiting spacecraft. The PSE includes electronics that track the probe, recover the data gathered during its descent, and process and deliver the data to the orbiter that transmits it to Earth. The core control computer CPU was a redundant MIL - STD - 1750A control system. The data were transmitted by a radio link between Huygens and Cassini provided by Probe Data Relay Subsystem ( PDRS ). As the probe 's mission could not be telecommanded from Earth because of the great distance, it was automatically managed by the Command Data Management Subsystem ( CDMS ). The PDRS and CDMS were provided by the Italian Space Agency ( ASI ). After Cassini 's launch, it was discovered that data sent back from the probe to European Space Agency 's mission control center was largely unreadable. It was determined that Cassini 's receiver was unable to accurately process the changes in frequency and wavelength of the signal it would be receiving from Huygens during its descent to Titan. The problem was rectified by changing the distance and angle of Cassini 's trajectory to Huygens during the landing. Selected events and discoveries Main article : Cassini -- Huygens timeline Venus and Earth fly - bys and the Cruise to Jupiter Picture of the Moon during flyby The Cassini space probe performed two gravitational - assist flybys of Venus on April 26, 1998, and June 24, 1999. These flybys provided the space probe with enough momentum to travel all the way out to the asteroid belt. At that point, the Sun 's gravity pulled the space probe back into the inner Solar System. On August 18, 1999, at 03 : 28 UTC, the craft made a gravitational - assist flyby of the Earth. One hour and 20 minutes before closest approach, Cassini made its closest approach to the Earth 's Moon at 377,000 kilometers, and it took a series of calibration photos. On January 23, 2000, Cassini performed a flyby of the asteroid 2685 Masursky at around 10 : 00 UTC. It took photos in the period five to seven hours before the flyby at a distance of 1.6 million kilometers, and a diameter of 15 to 20 km was estimated for the asteroid. Jupiter flyby A Jupiter flyby picture Cassini made its closest approach to Jupiter on December 30, 2000, and made many scientific measurements. About 26,000 images of Jupiter, its faint rings, and its moons were taken during the six month flyby. It produced the most detailed global color portrait of the planet yet ( see image at right ), in which the smallest visible features are approximately 60 km ( 37 mi ) across. Cassini photographed Io transiting Jupiter on January 1, 2001. A major finding of the flyby, announced on March 6, 2003, was of Jupiter 's atmospheric circulation. Dark `` belts '' alternate with light `` zones '' in the atmosphere, and scientists had long considered the zones, with their pale clouds, to be areas of upwelling air, partly because many clouds on Earth form where air is rising. But analysis of Cassini imagery showed that individual storm cells of upwelling bright - white clouds, too small to see from Earth, pop up almost without exception in the dark belts. According to Anthony Del Genio of NASA 's Goddard Institute for Space Studies, `` the belts must be the areas of net - rising atmospheric motion on Jupiter, ( so ) the net motion in the zones has to be sinking. '' Other atmospheric observations included a swirling dark oval of high atmospheric - haze, about the size of the Great Red Spot, near Jupiter 's north pole. Infrared imagery revealed aspects of circulation near the poles, with bands of globe - encircling winds, with adjacent bands moving in opposite directions. The same announcement also discussed the nature of Jupiter 's rings. Light scattering by particles in the rings showed the particles were irregularly shaped ( rather than spherical ) and likely originate as ejecta from micrometeorite impacts on Jupiter 's moons, probably Metis and Adrastea. Tests of general relativity On October 10, 2003, the mission 's science team announced the results of tests of Albert Einstein 's general theory of relativity, performed by using radio waves transmitted from the Cassini space probe. The radio scientists measured a frequency shift in the radio waves to and from the spacecraft, as those passed close to the Sun. According to the general theory of relativity, a massive object like the Sun causes space - time to curve, causing a beam of radiowaves ( or light, or any form of electromagnetic radiation ) that passes by the Sun to travel farther ( known as the Shapiro time delay ). Although some measurable deviations from the values calculated using the general theory of relativity are predicted by some unusual cosmological models, no such deviations were found by this experiment. Previous tests using radiowaves transmitted by the Viking and Voyager space probes were in agreement with the calculated values from general relativity to within an accuracy of one part in one thousand. The more refined measurements from the Cassini space probe experiment improved this accuracy to about one part in 51,000. The data firmly support Einstein 's general theory of relativity. New moons of Saturn The possible formation of a new moon was captured on April 15, 2013. In total, the Cassini mission discovered seven new moons orbiting Saturn. Using images taken by Cassini, researchers discovered Methone, Pallene and Polydeuces in 2004, although later analysis revealed that Voyager 2 had photographed Pallene in its 1981 flyby of the ringed planet. Discovery photograph of moon Daphnis On May 1, 2005, a new moon was discovered by Cassini in the Keeler gap. It was given the designation S / 2005 S 1 before being named Daphnis. A fifth new moon was discovered by Cassini on May 30, 2007, and was provisionally labeled S / 2007 S 4. It is now known as Anthe. A press release on February 3, 2009 showed a sixth new moon found by Cassini. The moon is approximately 1 / 3 of a mile ( 500 m ) in diameter within the G - ring of the ring system of Saturn, and is now named Aegaeon ( formerly S / 2008 S 1 ). A press release on November 2, 2009 mentions the seventh new moon found by Cassini on July 26, 2009. It is presently labeled S / 2009 S 1 and is approximately 300 m ( 1000 ft ) in diameter in the B - ring system. On April 14, 2014, NASA scientists reported the possible beginning of a new moon in the A Ring of the planet Saturn. Phoebe flyby Cassini arrival ( left ) and departure mosaics of Phoebe ( 2004 ) On June 11, 2004, Cassini flew by the moon Phoebe. This was the first opportunity for close - up studies of this moon ( Voyager 2 performed a distant flyby in 1981 but returned no detailed images ). It also was Cassini 's only possible flyby for Phoebe due to the mechanics of the available orbits around Saturn. The first close - up images were received on June 12, 2004, and mission scientists immediately realized that the surface of Phoebe looks different from asteroids visited by spacecraft. Parts of the heavily cratered surface look very bright in those pictures, and it is currently believed that a large amount of water ice exists under its immediate surface. Saturn rotation In an announcement on June 28, 2004, Cassini program scientists described the measurement of the rotational period of Saturn. Because there are no fixed features on the surface that can be used to obtain this period, the repetition of radio emissions was used. This new data agreed with the latest values measured from Earth, and constituted a puzzle to the scientists. It turns out that the radio rotational period had changed since it was first measured in 1980 by Voyager 1, and it was now 6 minutes longer. This, however, does not indicate a change in the overall spin of the planet, but is thought to be due to movement of the source of the radio emissions to a different latitude, at which the rotation rate is different. Orbiting Saturn Saturn reached equinox in 2008, shortly after the end of the prime mission. On July 1, 2004, the spacecraft flew through the gap between the F and G rings and achieved orbit, after a seven - year voyage. It was the first spacecraft to ever orbit Saturn. The Saturn Orbital Insertion ( SOI ) maneuver performed by Cassini was complex, requiring the craft to orient its High - Gain Antenna away from Earth and along its flight path, to shield its instruments from particles in Saturn 's rings. Once the craft crossed the ring plane, it had to rotate again to point its engine along its flight path, and then the engine fired to decelerate the craft by 622 meters / s to allow Saturn to capture it. Cassini was captured by Saturn 's gravity at around 8 : 54 pm Pacific Daylight Time on June 30, 2004. During the maneuver Cassini passed within 20,000 km ( 12,000 mi ) of Saturn 's cloud tops. When Cassini was in Saturnian orbit, departure from the Saturn system was evaluated in 2008 during end of mission planning. Titan flybys Titan 's surface was imaged by looking through the atmosphere in 2004, but some clouds remain visible. Cassini had its first flyby of Saturn 's largest moon, Titan, on July 2, 2004, a day after orbit insertion, when it approached to within 339,000 km ( 211,000 mi ) of Titan. Images taken through special filters ( able to see through the moon 's global haze ) showed south polar clouds thought to be composed of methane and surface features with widely differing brightness. On October 27, 2004, the spacecraft executed the first of the 45 planned close flybys of Titan when it passed a mere 1,200 kilometers above the moon. Almost four gigabits of data were collected and transmitted to Earth, including the first radar images of the moon 's haze - enshrouded surface. It revealed the surface of Titan ( at least the area covered by radar ) to be relatively level, with topography reaching no more than about 50 meters in altitude. The flyby provided a remarkable increase in imaging resolution over previous coverage. Images with up to 100 times better resolution were taken and are typical of resolutions planned for subsequent Titan flybys. Cassini collected pictures of Titan and the lakes of methane were similar to the lakes of Earth. Huygens lands on Titan Main article : Huygens ( spacecraft ) External image Raw images from the Huygens probe descent on 14 January 2005 ( 37 pages ) © ESA / NASA / JPL / U. of Arizona. ( ESA hosting ) Cassini released the Huygens probe on December 25, 2004, by means of a spring and spiral rails intended to rotate the probe for greater stability. It entered the atmosphere of Titan on January 14, 2005, and after a two - and - a-half - hour descent landed on solid ground. Although Cassini successfully relayed 350 of the pictures that it received from Huygens of its descent and landing site, a software error failed to turn on one of the Cassini receivers and caused the loss of another 350 pictures. While landing, for caution, NASA loaded Huygens with 3 parachutes. Enceladus flybys View of Enceladus 's Europa - like surface with the Labtayt Sulci fractures at center and the Ebony ( left ) and Cufa dorsa at lower left ; imaged by Cassini on February 17, 2005 During the first two close flybys of the moon Enceladus in 2005, Cassini discovered a deflection in the local magnetic field that is characteristic for the existence of a thin but significant atmosphere. Other measurements obtained at that time point to ionized water vapor as its main constituent. Cassini also observed water ice geysers erupting from the south pole of Enceladus, which gives more credibility to the idea that Enceladus is supplying the particles of Saturn 's E ring. Mission scientists began to suspect that there may be pockets of liquid water near the surface of the moon that fuel the eruptions. On March 12, 2008, Cassini made a close fly - by of Enceladus, passing within 50 km of the moon 's surface. The spacecraft passed through the plumes extending from its southern geysers, detecting water, carbon dioxide and various hydrocarbons with its mass spectrometer, while also mapping surface features that are at much higher temperature than their surroundings with the infrared spectrometer. Cassini was unable to collect data with its cosmic dust analyzer due to an unknown software malfunction. Wikinews has related news : Cassini discovers organic material on Saturn moon On November 21, 2009, Cassini made its eighth flyby of Enceladus, this time with a different geometry, approaching within 1,600 kilometers ( 990 mi ) of the surface. The Composite Infrared Spectrograph ( CIRS ) instrument produced a map of thermal emissions from the Baghdad Sulcus ' tiger stripe '. The data returned helped create a detailed and high resolution mosaic image of the southern part of the moon 's Saturn - facing hemisphere. On April 3, 2014, nearly ten years after Cassini entered Saturn 's orbit, NASA reported evidence of a large salty internal ocean of liquid water in Enceladus. The presence of an internal salty ocean in contact with the moon 's rocky core, places Enceladus `` among the most likely places in the Solar System to host alien microbial life ''. On June 30, 2014, NASA celebrated ten years of Cassini exploring Saturn and its moons, highlighting the discovery of water activity on Enceladus among other findings. In September 2015, NASA announced that gravitational and imaging data from Cassini were used to analyze the librations of Enceladus ' orbit and determined that the moon 's surface is not rigidly joined to its core, concluding that the underground ocean must therefore be global in extent. On October 28, 2015, Cassini performed a close flyby of Enceladus, coming within 49 km ( 30 mi ) of the surface, and passing through the icy plume above the south pole. Radio occultations of Saturn 's rings In May 2005, Cassini began a series of radio occultation experiments, to measure the size - distribution of particles in Saturn 's rings, and measure the atmosphere of Saturn itself. For over four months, the craft completed orbits designed for this purpose. During these experiments, it flew behind the ring plane of Saturn, as seen from Earth, and transmitted radio waves through the particles. The radio signals received on Earth were analyzed, for frequency, phase, and power shift of the signal to determine the structure of the rings. Upper image : visible color mosaic of Saturn 's rings taken on December 12, 2004. Lower image : simulated view constructed from a radio occultation observation on May 3, 2005. Color in the lower image represents ring particle sizes. Spokes in rings verified In images captured September 5, 2005, Cassini detected spokes in Saturn 's rings, previously seen only by the visual observer Stephen James O'Meara in 1977 and then confirmed by the Voyager space probes in the early 1980s. Lakes of Titan Main article : Lakes of Titan Ligeia Mare, on the left, is compared at scale to Lake Superior. Titan - Evolving feature in Ligeia Mare ( August 21, 2014 ). Radar images obtained on July 21, 2006 appear to show lakes of liquid hydrocarbon ( such as methane and ethane ) in Titan 's northern latitudes. This is the first discovery of currently existing lakes anywhere besides on Earth. The lakes range in size from one to one - hundred kilometers across. On March 13, 2007, the Jet Propulsion Laboratory announced that it had found strong evidence of seas of methane and ethane in the northern hemisphere of Titan. At least one of these is larger than any of the Great Lakes in North America. Saturn hurricane In November 2006, scientists discovered a storm at the south pole of Saturn with a distinct eyewall. This is characteristic of a hurricane on Earth and had never been seen on another planet before. Unlike a terrestrial hurricane, the storm appears to be stationary at the pole. The storm is 8,000 kilometers ( 5,000 mi ) across, and 70 kilometers ( 43 mi ) high, with winds blowing at 560 kilometers per hour ( 350 mph ). Iapetus flyby Taken on September 10, 2007 at a distance of 62,331 km ( 38,731 mi ) Iapetus 's equatorial ridge and surface are revealed. ( CL1 and CL2 filters ) Closeup of Iapetus surface, 2007 On September 10, 2007, Cassini completed its flyby of the strange, two - toned, walnut - shaped moon, Iapetus. Images were taken from 1,000 miles ( 1,600 km ) above the surface. As it was sending the images back to Earth, it was hit by a cosmic ray that forced it to temporarily enter safe mode. All of the data from the flyby were recovered. Mission extension On April 15, 2008, Cassini received funding for a 27 - month extended mission. It consisted of 60 more orbits of Saturn, with 21 more close Titan flybys, seven of Enceladus, six of Mimas, eight of Tethys, and one targeted flyby each of Dione, Rhea, and Helene. The extended mission began on July 1, 2008, and was renamed the Cassini Equinox Mission as the mission coincided with Saturn 's equinox. Second mission extension A proposal was submitted to NASA for a second mission extension ( September 2010 -- May 2017 ), provisionally named the extended - extended mission or XXM. This ( $60 M pa ) was approved in February 2010 and renamed the Cassini Solstice Mission. It included Cassini orbiting Saturn 155 more times, conducting 54 additional flybys of Titan and 11 more of Enceladus. Great storm of 2010 and aftermath Northern hemisphere storm in 2011 On October 25, 2012, Cassini witnessed the aftermath of the massive Great White Spot storm that recurs roughly every 30 years on Saturn. Data from the composite infrared spectrometer ( CIRS ) instrument indicated a powerful discharge from the storm that caused a temperature spike in the stratosphere of Saturn 83 K ( 83 ° C ; 149 ° F ) above normal. Simultaneously, a huge increase in ethylene gas was detected by NASA researchers at Goddard Research Center in Greenbelt, Maryland. Ethylene is a colorless gas that is highly uncommon on Saturn and is produced both naturally and through man - made sources on Earth. The storm that produced this discharge was first observed by the spacecraft on December 5, 2010 in Saturn 's northern hemisphere. The storm is the first of its kind to be observed by a spacecraft in orbit around Saturn as well as the first to be observed at thermal infrared wavelengths, allowing scientists to observe the temperature of Saturn 's atmosphere and track phenomena that are invisible to the naked eye. The spike of ethylene gas that was produced by the storm reached levels that were 100 times more than those thought possible for Saturn. Scientists have also determined that the storm witnessed was the largest, hottest stratospheric vortex ever detected in the Solar System, initially being larger than Jupiter 's Great Red Spot. Venus transit On December 21, 2012, Cassini observed a transit of Venus across the Sun. The VIMS instrument analyzed sunlight passing though the Venusian atmosphere. VIMS previously observed the transit of exoplanet HD 189733 b. The day the Earth smiled The Day the Earth Smiled - Saturn with some of its moons, Earth, Venus, and Mars as visible in this Cassini montage ( July 19, 2013 ) Main article : The Day the Earth Smiled On July 19, 2013, the probe was pointed towards Earth to capture an image of the Earth and the Moon, as part of a natural light, multi-image portrait of the entire Saturn system. The event was unique as it was the first time NASA informed the public that a long - distance photo was being taken in advance. The imaging team said they wanted people to smile and wave to the skies, with Cassini scientist, Carolyn Porco, describing the moment as a chance to `` celebrate life on the Pale Blue Dot ''. Rhea flyby On February 10, 2015, the Cassini spacecraft visited Rhea more closely, coming within 47,000 km ( 29,000 mi ). The spacecraft observed the moon with its cameras producing some of the highest resolution color images yet of Rhea. Hyperion flyby Cassini performed its latest flyby of Saturn 's moon Hyperion on May 31, 2015, at a distance of about 34,000 km ( 21,000 mi ). Hyperion - context view from 37,000 km ( 23,000 mi ) ( May 31, 2015 ) Hyperion - close - up view from 38,000 km ( 24,000 mi ) ( May 31, 2015 ) Dione flyby Cassini performed its last flyby of Saturn 's moon Dione on August 17, 2015, at a distance of about 475 km ( 295 mi ). A previous flyby was performed on June 16. Hexagon changes color Main article : Saturn 's hexagon Between 2012 and 2016, the hexagon changed from a mostly blue color to more of a golden color. One theory for this is that sunlight is creating haze as the pole is exposed to sunlight due to the change in season. It was previously noted that there was less blue color overall on Saturn between 2004 and 2008. 2012 and 2016 : hexagon color changes 2013 and 2017 : hexagon color changes Grand Finale and destruction Main article : Cassini retirement Cassini 's end involved a series of close Saturn passes, approaching within the rings, then an entry into Saturn 's atmosphere on September 15, 2017, to destroy the spacecraft. This method was chosen because it is imperative to ensure protection and prevent biological contamination to any of the moons of Saturn thought to offer potential habitability. In 2008 a number of options were evaluated to achieve this goal, each with varying funding, scientific, and technical challenges. A short period Saturn impact for an end of mission was rated `` excellent '' with the reasons `` D - ring option satisfies unachieved AO goals ; cheap and easily achievable '' while collision with an icy moon was rated `` good '' for being `` cheap and achievable anywhere / time ''. On November 29, 2016, the spacecraft performed a Titan flyby that took it to the gateway of F - ring orbits : This was the start of the Grand Finale phase culminating in its impact with the planet. A final Titan flyby on April 22, 2017, changed the orbit again to fly through the gap between Saturn and its inner ring days later on April 26. Cassini passed about 3,100 km ( 1,900 mi ) above Saturn 's cloud layer and 320 km ( 200 mi ) from the visible edge of the inner ring ; it successfully took images of Saturn 's atmosphere and began returning data the next day. After a further 22 orbits through the gap, the mission was ended with a dive into Saturn 's atmosphere on September 15 ; signal was lost at 7 : 55 : 46 AM EDT on September 15, 2017, just 30 seconds later than predicted. It is estimated that the spacecraft burned up about 45 seconds after the last transmission. Cassini impact site on Saturn ( visual / IR mapping spectrometer ; September 15, 2017 ) A close - up image of Saturn 's atmosphere from about 3,100 km ( 1,900 mi ) above the cloud layer, taken by Cassini on its first dive on April 26, 2017, at the start of the Grand Finale Last image ( color ) taken by Cassini as it descended toward Saturn. The image was taken 634,000 km / 394,000 miles above Saturn on September 14, 2017 at 19 : 59 UTC. Last image ( b&w ) taken by the imaging cameras on the Cassini spacecraft ( September 14, 2017 at 19 : 59 UTC ) Play media Video ( 03 : 40 ) detailing Cassini 's Grand Finale mission and a look back at what the mission has accomplished. Missions Cassini - Huygens by the numbers, as of September 2017 The spacecraft operation was organized around a series of missions. Each is structured according to a certain amount of funding, goals, etc. At least 260 scientists from 17 countries have worked on the Cassini -- Huygens mission ; in addition thousands of people overall worked to design, manufacture, and launch the mission. Prime Mission, July 2004 through June 2008. Cassini Equinox Mission was a two - year mission extension which ran from July 2008 through September 2010. Cassini Solstice Mission ran from October 2010 through April 2017. ( Also known as the XXM mission. ) Grand Finale ( spacecraft directed into Saturn ), April 2017 to September 15, 2017. Saturn by Cassini, 2016 Glossary AACS : Attitude and Articulation Control Subsystem ACS : Attitude Control Subsystem AFC : AACS Flight Computer ARWM : Articulated Reaction Wheel Mechanism ASI : Agenzia Spaziale Italiana, the Italian space agency BIU : Bus Interface Unit CAM : Command Approval Meeting CDS : Command and Data Subsystem -- Cassini computer that commands and collects data from the instruments CICLOPS : Cassini Imaging Central Laboratory for Operations CIMS : Cassini Information Management System CIRS : Composite Infrared Spectrometer DCSS : Descent Control Subsystem DSCC : Deep Space Communications Center DSN : Deep Space Network ( large antennas around the Earth ) DTSTART : Dead Time Start ELS : Electron Spectrometer ( part of CAPS instrument ) ERT : Earth - received time, UTC of an event ESA : European Space Agency ESOC : European Space Operations Centre FSW : flight software HGA : High Gain Antenna HMCS : Huygens Monitoring and Control System HPOC : Huygens Probe Operations Center IBS : Ion Beam Spectrometer ( part of CAPS instrument ) IEB : Instrument Expanded Blocks ( instrument command sequences ) IMS : Ion Mass Spectrometer ( part of CAPS instrument ) ITL : Integrated Test Laboratory -- spacecraft simulator IVP : Inertial Vector Propagator LGA : Low Gain Antenna NAC : Narrow Angle Camera NASA : National Aeronautics and Space Administration, the United States of America space agency OTM : Orbit Trim Maneuver PDRS : Probe Data Relay Subsystem PHSS : Probe Harness SubSystem POSW : Probe On - Board Software PPS : Power and Pyrotechnic Subsystem PRA : Probe Relay Antenna PSA : Probe Support Avionics PSIV : Preliminary Sequence Integration and Validation PSE : probe support equipment RCS : Reaction Control System RFS : Radio Frequency Subsystem RPX : ring plane crossing RWA : Reaction Wheel Assembly SCET : Spacecraft Event Time SCR : sequence change requests SKR : Saturn Kilometric Radiation SOI : Saturn Orbit Insertion ( July 1, 2004 ) SOP : Science Operations Plan SSPS : Solid State Power Switch SSR : Solid State Recorder SSUP : Science and Sequence Update Process TLA : Thermal Louver Assemblies USO : UltraStable Oscillator VRHU : Variable Radioisotope Heater Units WAC : Wide Angle Camera XXM : Extended - Extended Mission See also Moon portal Solar system portal Spaceflight portal Europlanet, data network Galileo, Jupiter orbiter and entry probe ( 1989 -- 2003 ) In Saturn 's Rings List of missions to the outer planets List of missions to Venus Planetary Science Decadal Survey Timeline of Cassini -- Huygens Tom Krimigis References ^ Jump up to : `` Cassini -- Huygens : Quick Facts ''. NASA. Retrieved August 20, 2011. Jump up ^ Krebs, Gunter Dirk. `` Cassini / Huygens ''. Gunter 's Space Page. Retrieved June 15, 2016. Jump up ^ Barber, Todd J. ( August 23, 2010 ). `` Insider 's Cassini : Power, Propulsion, and Andrew Ging ''. NASA. Archived from the original on April 2, 2012. Retrieved August 20, 2011. ^ Jump up to : Brown, Dwayne ; Cantillo, Laurie ; Dyches, Preston ( September 15, 2017 ). `` NASA 's Cassini Spacecraft Ends Its Historic Exploration of Saturn ''. NASA. Retrieved September 15, 2017. ^ Jump up to : Chang, Kenneth ( September 14, 2017 ). `` Cassini Vanishes Into Saturn, Its Mission Celebrated and Mourned ''. The New York Times. Retrieved September 15, 2017. Jump up ^ `` Cassini Post-End of Mission News Conference '' ( Interview ). Pasadena, CA : NASA Television. September 15, 2017. ^ Jump up to : `` Outer Planets Flagship - Science Mission Directorate ''. NASA. Jump up ^ Corum, Jonathan ( December 18, 2015 ). `` Mapping Saturn 's Moons ''. The New York Times. Retrieved December 18, 2015. Jump up ^ `` Saturn Plunge Nears for Cassini Spacecraft ''. NASA - National Aeronautics and Space Administration. August 29, 2017. Retrieved August 30, 2017. ^ Jump up to : Overbye, Dennis ( September 8, 2017 ). `` Cassini Flies Toward a Fiery Death on Saturn ''. The New York Times. Retrieved September 10, 2017. Jump up ^ Mosher, Dave ( April 5, 2017 ). `` NASA will destroy a $3.26 billion Saturn probe this summer to protect an alien water world ''. Business Insider. Retrieved May 2, 2017. Jump up ^ Chang, Kenneth ( May 3, 2017 ). `` The ' Sounds ' of Space as NASA 's Cassini Dives by Saturn ''. The New York Times. Retrieved May 3, 2017. Jump up ^ https://www.jpl.nasa.gov/video/details.php?id=1468 ^ Jump up to : `` ' Our Saturn years ' - Cassini - Huygens ' epic journey to the ringed planet, told by the people who made it happen ''. BBC News. Retrieved 2017 - 09 - 14. Jump up ^ `` Cassini - Huygens ''. Agenzia Spaziale Italiana. Jump up ^ Miller, Edward A. ; Klein, Gail ; Juergens, David W. ; Mehaffey, Kenneth ; Oseas, Jeffrey M. ; et al. ( October 1996 ). `` The Visual and Infrared Mapping Spectrometer for Cassini '' ( PDF ). Proceedings of the SPIE : Cassini / Huygens : A Mission to the Saturnian Systems. Cassini / Huygens : A Mission to the Saturnian Systems. 2803 : 206 -- 220. Bibcode : 1996SPIE. 2803... 206M. doi : 10.1117 / 12.253421. Jump up ^ Reininger, Francis M. ; Dami, Michele ; Paolinetti, Riccardo ; Pieri, Silvano ; Falugiani, Silvio ; et al. ( June 1994 ). `` Visible Infrared Mapping Spectrometer -- visible channel ( VIMS - V ) ''. Proceedings of the SPIE : Instrumentation in Astronomy VIII. Instrumentation in Astronomy VIII. 2198 : 239 -- 250. Bibcode : 1994SPIE. 2198... 239R. doi : 10.1117 / 12.176753. ^ Jump up to : Brown, Dwayne ; Martinez, Carolina ( April 15, 2008 ). `` NASA Extends Cassini 's Grand Tour of Saturn ''. NASA / Jet Propulsion Laboratory. Retrieved August 14, 2017. Jump up ^ `` Cassini - Huygens mission objectives ''. March 27, 2012. Jump up ^ `` Mission Summary ''. sci.esa.int. Retrieved February 3, 2017. Jump up ^ `` Cassini Solstice Mission - FAQs ''. Jet Propulsion Laboratory. Retrieved January 24, 2014. Jump up ^ `` NASA Extends Cassini Probe 's Mission at Saturn ''. Space.com. April 15, 2008. Retrieved September 1, 2010. Jump up ^ Moskowitz, Clara ( February 3, 2010 ). `` Cassini Saturn Probe Gets 7 - Year Life Extension ''. Space.com. Retrieved August 20, 2011. Jump up ^ Rensberger, Royce ( 28 November 1988 ). `` EUROPEANS ENDORSE JOINT SPACE MISSION ''. Retrieved 15 September 2017. Jump up ^ Morgan, Dan ( 18 October 1989 ). `` BIG INCREASES APPROVED FOR HOUSING, VETS ' CARE ''. Retrieved 15 September 2017. Jump up ^ William J. Broad ( September 8, 1997 ). `` Saturn Mission 's Use of Plutonium Fuel Provokes Warnings of Danger ''. The New York Times. Retrieved September 1, 2010. Jump up ^ `` Dozens arrested in protest of plutonium - fueled space mission ''. CNN. October 4, 1997. Retrieved September 1, 2010. Jump up ^ Christopher Boyd ( October 5, 1997 ). `` 27 Arrested at Protest of Cassini ''. Orlando Sentinel. Retrieved September 1, 2010. Jump up ^ `` Cassini Spacecraft Nears Liftoff, but Critics Object to its Risks ''. The New York Times. October 12, 1997. Retrieved September 1, 2010. Jump up ^ Daniel Sorid ( August 18, 1999 ). `` Activists Stand their Ground, Even As Cassini Sails Safely Away ''. Space.com. Retrieved September 1, 2010. ^ Jump up to : esa. `` Cassini spacecraft ''. Jump up ^ http://saturn.jpl.nasa.gov/files/space_probe_fact.pdf Jump up ^ Michael W Leeds : AIAA 96 - 2864 Development of the Cassini Propulsion Subsystem. 32nd AIAA / ASME / SAE / ASEE Joint Propulsion Conference, July 1, 1996, retrieved January 8, 2016 ^ Jump up to : Ruslan Krivobok : Russia to develop nuclear - powered spacecraft for Mars mission. Ria Novosti, November 11, 2009, retrieved January 2, 2011 Jump up ^ `` Signatures from Earth Board Spacecraft to Saturn ''. Cassini : The Grand Finale. Retrieved 2017 - 10 - 10. Jump up ^ `` 616,400 Signatures ''. Cassini : The Grand Finale. Retrieved 2017 - 10 - 10. Jump up ^ Overbye, Dennis ( August 6, 2014 ). `` Storm Chasing on Saturn ''. The New York Times. Retrieved August 6, 2014. ^ Jump up to : `` Cassini : Mission to Saturn : Cassini Orbiter ''. ^ Jump up to : `` Cassini Orbiter Instruments ''. Saturn.jpl.nasa.gov. Retrieved August 20, 2011. Jump up ^ `` CAPS team page ''. Caps.space.swri.edu. Retrieved August 20, 2011. Jump up ^ `` Cassini Significant Events newsletter 2012 03 26 ''. JPL. Jump up ^ Waite J.H. ; Lewis S. ; Kasprzak W.T. ; Anicich V.G. ; Block B.P. ; Cravens T.E. ; Fletcher G.G. ; Ip W.H. ; Luhmann J.G. ; McNutt R.L. ; Niemann H.B. ; Parejko J.K. ; Richards J.E. ; Thorpe R.L. ; Walter E.M. ; Yelle R.V. ( 2004 ). `` The Cassini ion and neutral mass spectrometer ( INMS ) investigation ''. Space Science Reviews. 114 ( 1 -- 4 ) : 113 -- 231. Bibcode : 2004SSRv... 114... 113W. doi : 10.1007 / s11214 - 004 - 1408 - 2. Jump up ^ `` INMS team page ''. Inms.space.swri.edu. Retrieved August 20, 2011. Jump up ^ Porco C.C. ; West R.A. ; Squyres S. ; McEwen A. ; Thomas P. ; Murray C.D. ; Delgenio A. ; Ingersoll A.P. ; Johnson T.V. ; Neukum G. ; Veverka J. ; Dones L. ; Brahic A. ; Burns J.A. ; Haemmerle V. ; Knowles B. ; Dawson D. ; Roatsch T. ; Beurle K. ; Owen W. ( 2004 ). `` Cassini Imaging Science : Instrument characteristics and anticipated scientific investigations at Saturn ''. Space Science Reviews. 115 ( 1 -- 4 ) : 363 -- 497. Bibcode : 2004SSRv... 115... 363P. doi : 10.1007 / s11214 - 004 - 1456 - 7. Jump up ^ Dougherty M.K. ; Kellock S. ; Southwood D.J. ; Balogh A. ; Smith E.J. ; Tsurutani B.T. ; Gerlach B. ; Glassmeier K.H. ; Gleim F. ; Russell C.T. ; Erdos G. ; Neubauer E.M. ; Cowley S.W.H. ( 2004 ). `` The Cassini magnetic field investigation ''. Space Science Reviews. 114 ( 1 -- 4 ) : 331 -- 383. Bibcode : 2004SSRv... 114... 331D. doi : 10.1007 / s11214 - 004 - 1432 - 2. Jump up ^ Krimigis S.M. ; Mitchell D.G. ; Hamilton D.C. ; Livi S. ; Dandouras J. ; Jaskulek S. ; Armstrong T.P. ; Boldt J.D. ; Cheng A.F. ; Gloeckler G. ; Hayes J.R. ; Hsieh K.C. ; Ip W.H. ; Keath E.P. ; Kirsch E. ; Krupp N. ; Lanzerotti L.J. ; Lundgren R. ; Mauk B.H. ; McEntire R.W. ; Roelof E.C. ; Schlemm C.E. ; Tossman B.E. ; Wilken B. ; Williams D.J. ( 2004 ). `` Magnetosphere imaging instrument ( MIMI ) on the Cassini mission to Saturn / Titan ''. Space Science Reviews. 114 ( 1 -- 4 ) : 233 -- 329. Bibcode : 2004SSRv... 114... 233K. doi : 10.1007 / s11214 - 004 - 1410 - 8. Jump up ^ `` Mimi Inca ''. Sd-www.jhuapl.edu. Retrieved August 20, 2011. ^ Jump up to : `` Why the Cassini Mission Cannot Use Solar Arrays '' ( PDF ). NASA / JPL. December 6, 1996. Archived from the original ( PDF ) on February 26, 2015. Retrieved March 21, 2014. Jump up ^ `` Cassini -- Huygens : Quick Facts ''. Saturn.jpl.nasa.gov. Retrieved July 1, 2014. ^ Jump up to : Cassini Final Environmental Impact Statement Archived June 8, 2011, at the Wayback Machine., see Chapter 2 Archived January 19, 2012, at the Wayback Machine., Table 2 - 8 Jump up ^ Friedensen, Victoria Pidgeon ( 1999 ). `` Chapter 3 ''. Protest Space : A Study of Technology Choice, Perception of Risk, and Space Exploration ( PDF ) ( Master of Science thesis ). Retrieved February 28, 2011. Jump up ^ Kan, Edwin P. ( November 1994 ). Process and Methodology of Developing Cassini G&C Telemetry Dictionary ( PDF ). Third International Symposium on Space Mission Operations and Ground Data Systems. Greenbelt. Jump up ^ How to Land on Titan, Ingenia, June 2005 Jump up ^ How Huygens avoided disaster, James Oberg, The Space Review, January 17, 2005. Jump up ^ `` New Cassini Images of Asteroid Available '' ( Press release ). JPL. February 11, 2000. Retrieved October 15, 2010. Jump up ^ Hansen C.J. ; Bolton S.J. ; Matson D.L. ; Spilker L.J. ; Lebreton J.P. ( 2004 ). `` The Cassini -- Huygens flyby of Jupiter ''. Icarus. 172 ( 1 ) : 1 -- 8. Bibcode : 2004Icar... 172... 1H. doi : 10.1016 / j. icarus. 2004.06. 018. Jump up ^ Bertotti B. ; Iess L. ; Tortora P. ( 2003 ). `` A test of general relativity using radio links with the Cassini spacecraft ''. Nature. 425 ( 6956 ) : 374 -- 376. Bibcode : 2003Natur. 425... 374B. PMID 14508481. doi : 10.1038 / nature01997. Jump up ^ This is currently the best measurement of post-Newtonian parameter γ ; the result γ = 1 + ( 2.1 ± 2.3 ) × 10 agrees with the prediction of standard General Relativity, γ = 1 Jump up ^ Meltzer 2015, pp. 346 - 351 Jump up ^ `` Newest Saturn moons given names '', BBC, February 28, 2005, retrieved September 1, 2016 Jump up ^ Spitale, J.N. ; Jacobson, R.A. ; Porco, C.C. ; Owen, W.M., Jr. ( 2006 ). `` The orbits of Saturn 's small satellites derived from combined historic and Cassini imaging observations '' ( PDF ). The Astronomical Journal. 132 ( 2 ) : 692 -- 710. Bibcode : 2006AJ... 132... 692S. doi : 10.1086 / 505206. Jump up ^ `` Surprise ! Saturn has small moon hidden in ring ''. NBC News. March 3, 2009. Archived from the original on December 17, 2013. Retrieved August 29, 2015. Jump up ^ Daniel W.E. Green ( November 2, 2009 ). `` IAU Circular No. 9091 ''. Ciclops.org. Retrieved August 20, 2011. Jump up ^ Platt, Jane ; Brown, Dwayne ( April 14, 2014 ). `` NASA Cassini Images May Reveal Birth of a Saturn Moon ''. NASA. Retrieved April 14, 2014. Jump up ^ Porco C.C. ; Baker E. ; Barbara J. ; Beurle K. ; Brahic A. ; Burns J.A. ; Charnoz S. ; Cooper N. ; Dawson D.D. ; Del Genio A.D. ; Denk T. ; Dones L. ; Dyudina U. ; Evans M.W. ; Giese B. ; Grazier K. ; Heifenstein P. ; Ingersoll A.P. ; Jacobson R.A. ; Johnson T.V. ; McEwen A. ; Murray C.D. ; Neukum G. ; Owen W.M. ; Perry J. ; Roatsch T. ; Spitale J. ; Squyres S. ; Thomas P.C. ; Tiscareno M. ; Turtle E. ; Vasavada A.R. ; Veverka J. ; Wagner R. ; West R. ( 2005 ). `` Cassini Imaging Science : Initial results on Phoebe and Iapetus ''. Science. 307 ( 5713 ) : 1237 -- 1242. Bibcode : 2005Sci... 307.1237 P. PMID 15731440. doi : 10.1126 / science. 1107981. Jump up ^ Carolina Martinez ; Gary Galluzzo ( June 28, 2004 ). `` Scientists Find That Saturn 's Rotation Period is a Puzzle ''. Jpl.Nasa.Gov. Retrieved August 20, 2011. Jump up ^ Porco, Carolyn C. ( 2007 ). `` Cassini, the first one thousand days ''. American Scientist. 95 ( 4 ) : 334 -- 341. doi : 10.1511 / 2007.66. 334. Jump up ^ `` Cassini / Huygens : Heavily Instrumented Flight Systems Approaching Saturn and Titan '' ( PDF ). Retrieved August 20, 2011. ^ Jump up to : `` Spilker_OPAG_0408. ppt '' ( PDF ). Retrieved August 20, 2011. Jump up ^ `` Huygens Probe Returns First Images of Titan 's Surface ''. Retrieved January 9, 2015. Jump up ^ Jia - Rui Cook ; Dyawne C. Brown ( July 6, 2011 ). `` Cassini Spacecraft Captures Images and Sounds of Big Saturn Storm ''. Saturn.jpl.nasa.gov. Archived from the original on March 3, 2008. Retrieved August 20, 2011. Jump up ^ Cassini Spacecraft to Dive Into Water Plume of Saturn Moon NASA.gov, March 10, 2008 Jump up ^ Cassini Tastes Organic Material at Saturn 's Geyser Moon NASA, March 26, 2008 Jump up ^ `` Cassini Sends Back Images of Enceladus as Winter Nears ''. Jump up ^ Amos, Jonathan ( April 3, 2014 ). `` Saturn 's Enceladus moon hides ' great lake ' of water ''. BBC News. Retrieved April 7, 2014. Jump up ^ Iess, L. ; Stevenson, D.J. ; Parisi, M. ; Hemingway, D. ; Jacobson, R.A. ; Lunine, J.I. ; Nimmo, F. ; Armstrong, J.w. ; Asmar, S.w. ; Ducci, M. ; Tortora, P. ( April 4, 2014 ). `` The Gravity Field and Interior Structure of Enceladus ''. Science. 344 ( 6179 ) : 78 -- 80. Bibcode : 2014Sci... 344... 78I. PMID 24700854. doi : 10.1126 / science. 1250551. Retrieved April 3, 2014. Jump up ^ Sample, Ian. `` Ocean discovered on Enceladus may be best place to look for alien life ''. The Guardian. Retrieved April 3, 2014. Jump up ^ Dyches, Preston ; Clavin, Whitney ( June 25, 2014 ). `` Cassini Celebrates 10 Years Exploring Saturn ''. NASA. Retrieved June 25, 2014. Jump up ^ `` Cassini Finds Global Ocean in Saturn 's Moon Enceladus ''. Retrieved September 14, 2015. Jump up ^ `` Deepest - Ever Dive Through Enceladus Plume Completed ''. Jet Propulsion Laboratory. October 28, 2015. Retrieved October 29, 2015. Jump up ^ Nemiroff, R. ; Bonnell, J., eds. ( November 27, 2006 ). `` Mysterious Spokes in Saturn 's Rings ''. Astronomy Picture of the Day. NASA. Retrieved December 5, 2013. Jump up ^ `` Catalog Page for PIA05380 ''. Photojournal.jpl.nasa.gov. Retrieved August 20, 2011. Jump up ^ `` The Rings of Saturn ''. phys.utk.edu. Retrieved December 5, 2013. Jump up ^ `` Cassini Spacecraft Captures Images and Sounds of Big Saturn Storm ''. Saturn.jpl.nasa.gov. July 6, 2011. Archived from the original on April 30, 2008. Retrieved August 20, 2011. Jump up ^ `` Cassini - Huygens : News ''. Saturn.jpl.nasa.gov. Archived from the original on May 8, 2008. Retrieved August 20, 2011. Jump up ^ `` Huge ' hurricane ' rages on Saturn ''. BBC News. November 10, 2006. Retrieved November 10, 2006. Jump up ^ `` Cassini Probe Flies by Iapetus, Goes into Safe Mode ''. Fox News. September 14, 2007. Jump up ^ `` Cassini 's Tour of the Saturn System ''. Planetary Society. Retrieved February 26, 2009. Jump up ^ `` Cassini To Earth : ' Mission Accomplished, But New Questions Await ! ' ''. Science Daily. June 29, 2008. Retrieved January 5, 2009. Jump up ^ John Spencer ( February 24, 2009 ). `` Cassini 's proposed extended - extended mission tour ''. Planetary.org. Retrieved August 20, 2011. Jump up ^ NASA Extends Cassini 's Tour of Saturn, Continuing International Cooperation for World Class Science. NASA / California Institute of Technology / Jet Propulsion Laboratory, February 3, 2010, retrieved January 2, 2011 Jump up ^ `` NASA - NASA Spacecraft Sees Huge Burp At Saturn After Large Storm ''. ^ Jump up to : `` Cassini Instrument Learns New Tricks ''. ^ Jump up to : Overbye, Dennis ( November 12, 2013 ). `` The View From Saturn ''. The New York Times. Retrieved November 12, 2013. Jump up ^ `` Cassini probe takes image of Earth from Saturn orbit ''. BBC News. July 23, 2013. Retrieved July 24, 2013. Jump up ^ `` Smile ! Cassini sets up photo of Earth ''. BBC News. July 19, 2013. Retrieved July 24, 2013. Jump up ^ `` Saturn Tour Dates : 2015 ''. NASA / Jet Propulsion Laboratory. 2015. Archived from the original on May 18, 2015. Retrieved May 2, 2017. Jump up ^ `` Return to Rhea ( NASA Cassini Saturn Mission Images ) ''. Cassini Imaging Central Laboratory for Operations. March 30, 2015. PIA19057. Jump up ^ `` Cassini Prepares for Last Up - close Look at Hyperion ''. NASA / Jet Propulsion Laboratory. May 28, 2015. Retrieved May 29, 2015. Jump up ^ `` Cassini to Make Last Close Flyby of Saturn Moon Dione ''. NASA / Jet Propulsion Laboratory. August 13, 2015. Retrieved August 20, 2015. ^ Jump up to : `` Changing Colors in Saturn 's North ''. ^ Jump up to : Spencer, John ( February 24, 2009 ). `` Cassini 's Proposed Extended - Extended Mission Tour ''. The Planetary Society. Jump up ^ Blabber, Phillipa ; Verrecchia, Angélique ( April 3, 2014 ). `` Cassini - Huygens : Preventing Biological Contamination ''. Space Safety Magazine. Retrieved August 1, 2015. ^ Jump up to : Bailey, Frederick ; Rabstejnek, Paul. `` Cassini Mission and Results ''. Oglethorpe University. Archived from the original on February 19, 2008. Jump up ^ `` 2016 Saturn Tour Highlights ''. Jump up ^ Lewin, Sarah. `` Cassini Mission Kicks Off Finale at Saturn ''. Scientific American. Retrieved November 30, 2016. Jump up ^ Dyches, Preston ; Brown, Dwayne ; Cantillo, Laurie ( April 27, 2017 ). `` NASA Spacecraft Dives Between Saturn and Its Rings ''. NASA / Jet Propulsion Laboratory. Retrieved May 2, 2017. Jump up ^ Loff, Sarah ( 2017 - 09 - 15 ). `` Impact Site : Cassini 's Final Image ''. NASA. Retrieved 2017 - 09 - 17. ^ Jump up to : `` Cassini Equinox Mission ''. European Space Agency. October 18, 2011. Retrieved April 15, 2017. Jump up ^ `` Cassini : Mission to Saturn : The Team ''. NASA. Jump up ^ `` Cassini Tour of Saturn and its Moons ''. European Space Agency. October 7, 2008. Retrieved April 15, 2017. Jump up ^ `` Start of the Cassini Equinox Mission ''. European Space Agency. June 30, 2008. Retrieved April 15, 2017. ^ Jump up to : `` The Grand Finale Toolkit ''. NASA. Retrieved April 15, 2017. Further reading Ralph Lorenz ( 2017 ). NASA / ESA / ASI Cassini - Huygens : 1997 onwards ( Cassini orbiter, Huygens probe and future exploration concepts ) ( Owners ' Workshop Manual ). Haynes Manuals, UK. ISBN 978 - 1785211119. Karl Grossman ( 1997 ). The Wrong Stuff : The Space Program 's Nuclear Threat to Our Planet. Common Courage Press. ISBN 1 - 56751 - 125 - 2. David M. Harland ( 2002 ). Mission to Saturn : Cassini and the Huygens Probe. Springer - Verlag. ISBN 1 - 85233 - 656 - 0. Ralph Lorenz ; Jacqueline Mitton ( 2002 ). Lifting Titan 's Veil : Exploring the Giant Moon of Saturn. Cambridge University Press. ISBN 0 - 521 - 79348 - 3. Meltzer, Michael ( 2015 ). The Cassini - Huygens Visit to Saturn : A Historic Mission to the Ringed Planet. Cham : Springer International Publishing Switzerland. ISBN 978 - 3 - 319 - 07608 - 9. Irene Klotz ( Aug 31, 2017 ). `` Cassini 's Ringside Seat At Saturn Coming To An End ''. Aviation Week & Space Technology. An epic journey of discovery at Saturn ends, leaving mysteries for future explorers. External links Wikimedia Commons has media related to Cassini - Huygens. Official websites Cassini - Huygens website by the Jet Propulsion Laboratory Cassini - Huygens website by NASA Cassini - Huygens website by the European Space Agency Cassini - Huygens website by NASA 's Solar System Exploration division Media and telecommunications CICLOPS.org, Cassini imaging homepage Cassini Hall of Fame, image galleries by the Jet Propulsion Laboratory `` Cassini at Saturn '', a YouTube playlist by the Jet Propulsion Laboratory `` Titan Touchdown '', Depiction of Huygens descent and landing DESCANSO DSN Telecom information In Saturn 's Rings, film animated from millions of still photographs Around Saturn, film animated from more than 200,000 images taken by Cassini from 2004 to 2012 WebGL - based 3D rendering of Cassini Spacecraft missions to Saturn Orbiters Cassini -- Huygens timeline retirement Landers Huygens ( Titan ) Flybys Pioneer 11 Voyager 1 Voyager 2 Proposed missions AVIATR Dragonfly Enceladus Life Finder ( Enceladus only ) Enceladus Explorer ( Enceladus only ) Explorer of Enceladus and Titan Journey to Enceladus and Titan Kronos Life Investigation For Enceladus ( Enceladus only ) Oceanus ( Titan only ) Saturn Atmospheric Entry Probe Saturn Ring Observer SPRITE TALISE ( Titan only ) Titan Mare Explorer ( Titan only ) Titan Saturn System Mission Former plans Soviet mission plan There are no ongoing missions to Saturn 21st - century space probes Active space probes Moon ARTEMIS Lunar Reconnaissance Orbiter Mars ExoMars TGO Mangalyaan Mars Express 2001 Mars Odyssey MAVEN MER Opportunity MRO MSL Curiosity Minor planets Chang'e 2 Dawn Hayabusa 2 / MASCOT New Horizons OSIRIS - REx PROCYON Others ACE Akatsuki Gaia IKAROS Juno SOHO STEREO THEMIS Voyager 1 Voyager 2 Completed after 2000 by termination date NEAR Shoemaker Deep Space 1 2003 Pioneer 10 Galileo Nozomi Genesis 2005 Huygens 2006 Mars Global Surveyor 2008 Phoenix 2009 Chang'e 1 Ulysses Chandrayaan - 1 SELENE LCROSS Hayabusa MER Spirit 2011 Stardust 2012 GRAIL 2013 Deep Impact 2014 LADEE Venus Express Chang'e 5 - T1 2015 MESSENGER Chang'e 3 / Yutu 2016 Rosetta / Philae ExoMars Schiaparelli 2017 LISA Pathfinder Cassini List of Solar System probes List of missions to the Moon List of space telescopes Jet Propulsion Laboratory Current missions ACRIMSAT AIRS ASTER Dawn GRACE Juno W.M. Keck Observatory Kepler 2001 Mars Odyssey LBT MER MISR MLS MRO MSL Rosetta Spitzer Space Telescope TES Voyager Past missions Cassini - Huygens Deep Impact Deep Space 1 Deep Space 2 Explorer GALEX Galileo Genesis Herschel IRAS Jason - 1 Magellan Mariner Mars Climate Orbiter Mars Observer Mars Pathfinder Mars Polar Lander Mars Global Surveyor NSCAT Phoenix Pioneer QuikSCAT Ranger Seasat SIR SME Stardust SRTM Surveyor SVLBI TOPEX / Poseidon Ulysses Viking WFPC WIRE Cancelled missions AFL Related organizations NASA Caltech Deep Space Network Goldstone Complex Table Mountain Observatory Solar System Ambassadors NASA Policy and history History NACA ( 1915 ) National Aeronautics and Space Act ( 1958 ) Space Task Group ( 1958 ) Paine ( 1986 ) Rogers ( 1986 ) Ride ( 1987 ) Space Exploration Initiative ( 1989 ) Augustine ( 1990 ) U.S. National Space Policy ( 1996 ) CFUSAI ( 2002 ) CAIB ( 2003 ) Vision for Space Exploration ( 2004 ) Aldridge ( 2004 ) Augustine ( 2009 ) General Space Race Administrator and Deputy Administrator Chief Scientist Astronaut Corps Budget Spin - off technologies NASA TV NASA Social Launch Services Program Kennedy Space Center Vehicle Assembly Building Launch Complex 39 Launch Control Center Johnson Space Center Mission Control Lunar Sample Laboratory Robotic programs Past Hitchhiker Mariner Mariner Mark II MESUR Mars Surveyor ' 98 New Millennium Lunar Orbiter Pioneer Planetary Observer Ranger Surveyor Viking Project Prometheus Mars Scout Current Living With a Star Lunar Precursor Robotic Program Earth Observing System Great Observatories program Explorer Small explorer Voyager Discovery New Frontiers Mars Exploration Rover Human spaceflight programs Past X-15 ( suborbital ) Mercury Gemini Apollo Apollo -- Soyuz Test Project ( with the Soviet space program ) Skylab Space Shuttle Shuttle -- Mir ( with Roscosmos State Corporation ) Constellation Current International Space Station Commercial Orbital Transportation Services ( COTS ) Commercial Crew Development ( CCDev ) Orion Individual featured missions ( human and robotic ) Past COBE Apollo 11 Mercury 3 Mercury - Atlas 6 Magellan Pioneer 10 Pioneer 11 Galileo GALEX GRAIL WMAP Space Shuttle Sojourner rover Spirit rover LADEE MESSENGER Aquarius Cassini Currently operating MRO 2001 Mars Odyssey Dawn New Horizons Kepler International Space Station Hubble Space Telescope Spitzer RHESSI SWIFT THEMIS Mars Exploration Rover Curiosity rover timeline Opportunity rover observed GOES 14 Lunar Reconnaissance Orbiter GOES 15 Van Allen Probes SDO Juno Mars Science Laboratory timeline NuSTAR Voyager 1 / 2 WISE MAVEN MMS OSIRIS - REx Future JPSS James Webb Space Telescope WFIRST InSight Mars 2020 NISAR Transiting Exoplanet Survey Satellite Europa Clipper Communications and navigation Canberra Deep Space Atomic Clock Deep Space Network ( Goldstone Madrid Near Earth Network Space Flight Operations Facility ) Space Network NASA lists List of astronauts by name by year Apollo astronauts List of NASA aircraft List of NASA missions unmanned missions List of NASA contractors List of United States rockets List of NASA cancellations List of Space Shuttle missions crews NASA images and artwork Earthrise The Blue Marble Family Portrait Pale Blue Dot Pillars of Creation Mystic Mountain Solar System Family Portrait The Day the Earth Smiled Fallen Astronaut Lunar plaques Pioneer plaques Voyager Golden Record NASA insignia Gemini and Apollo medallions Mission patches Commons Portal Saturn Outline of Saturn Geography Dragon Storm Great White Spot Hexagon Magnetosphere Rings Moons S / 2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S / 2004 S 6 S / 2004 S 4 S / 2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi Albiorix S / 2007 S 2 Bebhionn Erriapus Skoll Siarnaq Tarqeq S / 2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S / 2006 S 1 S / 2004 S 17 Bergelmir Narvi Suttungr Hati S / 2004 S 12 Farbauti Thrymr Aegir S / 2007 S 3 Bestla S / 2004 S 7 S / 2006 S 3 Fenrir Surtur Kari Ymir Loge Fornjot Astronomy Delta Octantis Saturn - crossing minor planets Exploration Cassini -- Huygens ( Huygens ) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2 Related Fiction Saturn Moons Titan General Atmosphere of Titan Climate of Titan Life on Titan Lists Lakes of Titan List of geological features on Titan Lakes and seas Seas Kraken Mare Ligeia Mare Punga Mare Lakes Abaya Lacus Bolsena Lacus Feia Lacus Hammar Lacus Jingpo Lacus Kivu Lacus Koitere Lacus Ladoga Lacus Mackay Lacus Müggel Lacus Neagh Lacus Ontario Lacus Sotonera Lacus Dry lakes Eyre Lacuna Ngami Lacuna Woytchugga Lacuna Features Adiri Arrakis Planitia Dilmun Doom Mons Erebor Mons Ganesa Macula Guabonito Irensaga Montes Mayda Insula Menrva Mezzoramia Mindolluin Montes Misty Montes Mithrim Montes Perkunas Virgae Shangri - La Shikoku Facula Sotra Patera Taniquetil Montes Tsegihi Tui Regio Xanadu Exploration Past Pioneer program Pioneer 11 Voyager program Voyager 1 Voyager 2 Cassini -- Huygens Huygens Proposed AVIATR Dragonfly Explorer of Enceladus and Titan Journey to Enceladus and Titan TALISE Titan Mare Explorer Titan Saturn System Mission Oceanus See also Colonization of Titan Other topics Memorials on Titan Titan in fiction Christiaan Huygens Books Systema Saturnium ( 1659 ) De Vi Centrifiga ( 1659 ) Horologium Oscillatorium ( 1673 ) Traité de la Lumiére ( 1692 ) Cosmotheoros ( 1698 ) In science and natural philosophy Centripetal acceleration Coupled oscillation Conception of the standardization of the temperature scale Early history of classical mechanics Early history of calculus Huygens ' law Huygens ' lemniscate Huygens ' principle ( Huygens -- Fresnel principle ) Huygens ' construction Huygens ' tritone Huygens ' wavelet Huygens ' wave theory Huygens -- Steiner theorem Hypothesis of intelligent extraterrestrial life Isochrone curve ( tautochrone curve ) Foundations of differential geometry of curves ( mathematical notions of the evolute and involute of the curve ) Scientific foundations of horology Mathematical and physical investigations of properties of the pendulum Modern conception of centrifugal and centripetal forces Music theory of microtones ( 31 equal temperament ) Polarization of light ( Iceland spar ) Rings of Saturn Titan ( moon ) Theoretical foundations of wave optics ( wave theory of light ) In technology Inventions by Huygens Aerial telescope Cycloidal pendulum Huygens ' engine Huygens ' eyepiece Magic lantern Spiral balance spring Precision timekeeping ( pendulum clock and spiral - hairspring watch ) Recognitions List of things named after Christiaan Huygens 2801 Huygens Cassini -- Huygens Huygens probe Mons Huygens Huygens ( crater ) Huygens - Fokker Foundation Huygens Gap Huygens Ringlet Horologium ( constellation ) Other topics Cosmos : A Personal Voyage - Episode 6 : `` Travellers ' Tales '' ( 1980 documentary TV series by Carl Sagan ) Clocks and Culture, 1300 -- 1700 ( 1967 history book by Carlo Cipolla ) Revolution in Time : Clocks and the Making of the Modern World ( 1983 history book by David Landes ) Scientific Revolution Golden Age of Dutch science and technology Science and technology in the Dutch Republic Académie des Sciences Related people Huygens family Galileo Galilei René Descartes Salomon Coster Antonie van Leeuwenhoek Gottfried Wilhelm Leibniz Isaac Newton Robert Hooke Denis Papin Augustin - Jean Fresnel Thomas Young A rudimentary prototype of internal combustion piston engine. An early practical type of image projector and a precursor to both the modern slide projector and the movie projector. Wikiquote Wikisource texts Retrieved from `` https://en.wikipedia.org/w/index.php?title=Cassini -- Huygens&oldid = 806102030 '' Categories : Cassini -- Huygens Spacecraft launched in 1997 European Space Agency space probes NASA space probes Spacecraft launched by Titan rockets Lunar flybys Space synthetic aperture radar Missions to main - belt asteroids Missions to Saturn Missions to Jupiter Jet Propulsion Laboratory 1997 in Florida Christiaan Huygens Orbiters ( space probe ) Space radars Giovanni Domenico Cassini Extraterrestrial atmosphere entry Destroyed space probes Hidden categories : Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from September 2017 Articles needing additional references from October 2014 All articles needing additional references Articles with unsourced statements from July 2015 Articles with unsourced statements from February 2016 Wikipedia articles needing clarification from February 2016 Articles needing more detailed references Use mdy dates from April 2017 Talk Contents About Wikipedia Afrikaans Alemannisch বাংলা Bân - lâm - gú Беларуская भोजपुरी Български Bosanski Català Čeština Cymraeg Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Français Gaeilge Galego 한국어 हिन्दी Hrvatski Ido Bahasa Indonesia Interlingua Íslenska Italiano עברית ಕನ್ನಡ Kiswahili Latviešu Lëtzebuergesch Lietuvių Limburgs Lumbaart Magyar മലയാളം Bahasa Melayu မြန်မာဘာသာ Nederlands 日本 語 Norsk Norsk nynorsk Polski Português Română Русский Scots Shqip Sicilianu සිංහල Simple English Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் ไทย Türkçe Українська Tiếng Việt 粵語 中文 Edit links This page was last edited on 19 October 2017, at 18 : 22. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: when did the cassini spacecraft arrived at saturn
Answer: July 1, 2004