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COVID-19 Forecasting and Mathematical ModelingCOVID-19 Forecasting and Mathematical Modeling 


	Updated June 27, 2023	

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As of May 2024, CDC will pause weekly reporting of COVID-19 hospitalization forecasts because the COVID-19 Forecast Hub has paused accepting submissions and is undergoing infrastructure updates. We plan to resume weekly forecast reporting in the fall and will update this page to reflect the expected release date closer to that time.

Why COVID-19 Forecasting and Mathematical Modeling Are Important
Forecasts of disease burden help inform public health decision making by projecting the likely impact of COVID-19 in the next few weeks.  These forecasts are generated using mathematical models by CDC partners in the COVID-19 Forecast Hub. Forecasts are used to inform public health decisions about pandemic planning, resource allocation, implementation of social distancing measures, and other interventions. CDC is working closely with state, tribal, local, and territorial health departments, and other public health partners, to respond to the COVID-19 pandemic.
Bringing Together Forecasts for COVID-19 in the United States
CDC works with partners to bring together weekly forecasts based on statistical or mathematical models that aim to predict national and state numbers of new COVID-19 hospitalizations per day for the next 4 weeks.

COVID-19 Forecasts: Hospitalizations

Previously, forecasts also predicted the number of new COVID-19 deaths and cases per week. Death forecasts stopped in March 2023 and case forecasts stopped in February 2022.
NASA - NSSDCA - Spacecraft - Details
NASA - NSSDCA - Spacecraft - Details

Friday, 22 March 2024

Deep Impact/EPOXINSSDCA/COSPAR ID: 2005-001ADescriptionThe goals of the Deep Impact mission were to rendezvous with comet 9P/Tempel 1 and launch a projectile into the comet nucleus. Observations were made of the ejecta, much of which represented pristine material from the interior of the comet, the crater formation process, the resulting crater, and outgassing from the nucleus, particularly the newly exposed surface. The scientific objectives of the mission are to: improve the knowledge of the physical characteristics of cometary nuclei and directly assess the interior of cometary nucleus; determine properties of the surface layers such as density, strength, porosity, and composition from the crater and its formation; study the relationship between the surface layers of a cometary nucleus and the possibly pristine materials of the interior by comparison of the interior of the crater with the surface before impact; and improve our understanding of the evolution of cometary nuclei, particularly their approach to dormancy, by comparing the interior and the surface. This project was selected as a Discovery class mission in July, 1999. After the primary mission, Deep Impact was selected for a two-part extended mission designated EPOXI.

Spacecraft and Subsystems

The spacecraft consists of a 370 kg cylindrical copper impactor attached to a 650 kg flyby bus. The spacecraft is a box-shaped honeycomb aluminum framework with a flat rectangular Whipple debris shield mounted on one side to protect components during comet close approach. Body mounted on the framework are one high- and one medium-resolution instrument, each of which consists of an imaging camera and an infrared spectrometer which will be used to observe the ejected ice and dust, much of which will be exposed to space for the first time in over 4 billion years. The medium resolution camera has a field of view (FOV) of 0.587 degrees and a resolution of 7 m/pixel at 700 km distance and is used for navigation and context images. The high resolution camera has a FOV of 0.118 degrees and a resolution of 1.4 m/pixel at 700 km.
Explore Earth Science - NASA Science
Missions begin with a study phase during which the key science objectives of the mission are identified, and designs for spacecraft and instruments are analyzed. Following a successful study phase, missions enter a development phase whereby all aspects of the mission are developed and tested to insure it meets the mission objectives. Operating missions are those missions that are currently active and providing science data to researchers. Operating missions may be in their primary operational phase or in an extended operational phase. Missions begin with a study phase during which the key science objectives of the mission are identified, and designs for spacecraft and instruments are analyzed. Following a successful study phase, missions enter a development phase whereby all aspects of the mission are developed and tested to insure it meets the mission objectives.NASA's Earth observing satellite fleet (as of April 10, 2024)Return to topThe National Aeronautics and Space AdministrationNASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery.About NASA's MissionJoin UsHomeNews & EventsMultimediaNASA+MissionsHumans in SpaceEarth & ClimateThe Solar SystemThe UniverseScienceAeronauticsTechnologyLearning ResourcesAbout NASANASA en EspañolFollow NASAMore NASA Social AccountsNASA NewslettersSitemapFor MediaPrivacy PolicyFOIANo FEAR ActOffice of the IGBudget & Annual ReportsAgency Financial ReportsContact NASAAccessibilityPage Last Updated:4 days agoPage Editor:SMD Content EditorsResponsible NASA Official for Science:Dana Bolles
NASA - NSSDCA - Spacecraft - Details
At this point (about 961 seconds after impact) imaging ended as the spacecraft reoriented itself by 45 degrees to optimize protection from dust damage as it flew by the nucleus. Closest approach to the nucleus was at a distance of about 500 km. At 1270 seconds the crossing of the inner coma was complete and the spacecraft oriented itself to look back at the comet and begin imaging again. At 3000 seconds the spacecraft began playback of data to Earth at 20 to 200 kilobits per second. The comet and spacecraft were about 0.89 AU from Earth and 1.5 AU from the Sun during the encounter. Real time return of selected impactor images and flyby images and spectra were returned to Earth during the encounter. Primary data return took place over the first day after encounter, with a 28 day supplemental data return period. Earth-based observatories also studied the impact. The spacecraft ranged over a distance of 0.93 to 1.56 AU from the Sun during the primary mission. End of primary mission was August 2005. The total budget for the primary mission was $240 million.

EPOXI Extended Mission

Deep Impact has been funded for an extended mission which has two parts. The Deep Impact Extended Investigation (DIXI) involved flying by comet 103P/Hartley 2 on 4 November 2010 at a closest approach of approximately 700 km. (The original target was comet Boethin on 5 December 2008) and returning images and data. The Extrasolar Planet Observation and Characterization (EPOCh) investigation used the Deep Impact imaging system to observe nearby bright stars with known large planets to characterize the planets as they orbit behind and in front of the stars and to search other planets in those systems. This phase of the mission began 26 January 2008 and continued until the end of July. The spacecraft made three close Earth / Moon flybys to target itself for Hartley 2, on 31 December 2007, 29 December 2008, and 27 June 2010. Scientific observations of the Earth and Moon were made. The encounter with Hartley 2 took place on 4 November 2010 at approximately 14:00 UT (10:00 a.m. EDT) at a distance of roughly 700 km.
NASA - NSSDCA - Spacecraft - Details
For the Deep Impact Impactor (DII) spacecraft record, see:

http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2005-001D

Mission Profile

Deep Impact launched on 12 January 2005 at 18:47:08.574 UT (1:47:08 p.m. EST) on a Delta II. The spacecraft transferred into a heliocentric orbit and will rendezvous with comet P/Tempel 1 in July 2005. Deep Impact was 880,000 km from the comet on 3 July 2005 moving at a velocity of 10.2 km/s relative to the comet. The projectile was released at this point and shortly after release the flyby spacecraft executed a maneuver to slow down relative to the impactor by 120 m/s and divert by 6 m/s. On 4 July the impactor struck the sunlit side of the comet nucleus 24 hours after release, at 5:52 UT (1:52 a.m. EDT). At 10.2 km/s velocity, the impactor had an impact energy of about 19 gigajoules, and hit at an oblique angle of approximately 25 degrees. Material from the nucleus was ejected into space and the impactor and much of the ejecta was vaporized.

The flyby spacecraft was approximately 10,000 km away at the time of impact and began imaging 60 seconds before impact. At 600 seconds after impact the spacecraft was about 4000 km from the nucleus and observations of the crater began and continued up to a range of about 700 km, about 50 seconds before closest approach. At this point (about 961 seconds after impact) imaging ended as the spacecraft reoriented itself by 45 degrees to optimize protection from dust damage as it flew by the nucleus. Closest approach to the nucleus was at a distance of about 500 km. At 1270 seconds the crossing of the inner coma was complete and the spacecraft oriented itself to look back at the comet and begin imaging again. At 3000 seconds the spacecraft began playback of data to Earth at 20 to 200 kilobits per second. The comet and spacecraft were about 0.89 AU from Earth and 1.5 AU from the Sun during the encounter.
NASA - NSSDCA - Spacecraft - Details
Rev., 117, No. 1-2, 95-121, doi:10.1007/s11214-005-3394-4, Mar. 2005.Veverka, J., et al., Return to Comet Tempel 1: Overview of Stardust-NExT results,
 Icarus, 222, No. 2, 424-435, doi:10.1016/j.icarus.2012.03.034, Feb. 2013.Wellnitz, D. D., et al., The location of the impact point of the Deep Impact Impactor on Comet 9P/Tempel 1,
 Icarus, 222, No. 2, 487-491, doi:10.1016/j.icarus.2012.08.003, Feb. 2013.Schultz, P. H., et al., The Deep Impact crater on 9P/Tempel-1 from Stardust-NExT,
 Icarus, 222, No. 2, 502-515, doi:10.1016/j.icarus.2012.06.018, Feb. 2013.

Comet Hartley 2 at EPOXI closest approach - 4 November 2010

 Images of the Deep Impact encounter with Comet Tempel 1 - 4 July 2005

 Call for CCD Observations of Comet Tempel 1

 Comet Page

 Comet Fact Sheet

 NASA's Discovery Program

Deep Impact Press Releases

 NASA sends spacecraft on mission to Comet Hartley 2 - 13 December 2007

 New extended missions chosen for Deep Impact - 3 July 2007

 Deep Impact extended missions chosen for further study - 30 October 2006

 NASA's Deep Impact tells a tale of the comet - 4 July 2005

 Deep Impact kicks off Fourth of July with deep space fireworks - 4 July 2005

 NASA announces spectacular day of the comet - 9 June 2005

 NASA's Deep Impact spacecraft spots its quarry, stalking begins - 27 April 2005

 NASA releases Deep Impact mission status report - 25 March 2005

 Deep Impact launched and flying toward date with a comet - 12 January 2005

 Deep Impact arrives in Florida to prepare for launch - 18 October 2004

 Deep Impact launch date changed - 01 April 2003

 University of Maryland Press Release on Deep Impact - 07 July 1999

 EPOXI Project Home Page
Overview - NASA Science
Overview - NASA Science

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Missions - NASA Science

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NASA - NSSDCA - NMC - Data Collection - Query Results
NASA - NSSDCA - NMC - Data Collection - Query Results

Saturday, 25 May 2024

Data Collection Search Results
 There
 were 66
 data collections returned.
 Data Collection NameSpacecraft: ExperimentDeep Impact SPICE Navigation Files (PDS)Deep Impact/EPOXIDeep Impact Impactor (DII) VehicleDeep Impact Thermal Vacuum Test Archive (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact/EPOXI:Medium Resolution Instrument (MRI)Deep Impact Comet Tempel 1 Support Archives (PDS)IRAS:IR TelescopeDeep Impact HRIV Raw Image Calibration Archive, Cruise Phase (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact HRIV Raw Image Archive, 9P/Tempel 1 Encounter (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact HRIV Reduced Image Archive, Comet 9P/Tempel 1 Encounter (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact HRII Raw Spectral Image Archive, 9P/Tempel 1 Encounter (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact HRII Raw Spectral Image Calibration Archive, 9P/Tempel 1 Cruise (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact HRII Reduced Spectral Image Archive, 9P/Tempel 1 Encounter (PDS)Deep Impact/EPOXI:High Resolution Instrument (HRI)Deep Impact MRI Raw Image Calibration Archive, Cruise Phase (PDS)Deep Impact/EPOXI:Medium Resolution Instrument (MRI)Deep Impact MRI Raw Image Archive, Encounter Phase (PDS)Deep Impact/EPOXI:Medium Resolution Instrument (MRI)Deep Impact MRI Reduced Image Archive, Encounter Phase (PDS)Deep Impact/EPOXI:Medium Resolution Instrument (MRI)Deep Impact Spice Files (PDS)Deep Impact/EPOXIDeep Impact HRII Reduced Spectral Image Archive, 9P/Tempel 1 Encounter (Version 2) (PDS)Deep Impact/
Mars Exploration Science Goals - NASA Science
Mars Exploration Science Goals - NASA Science

 Skip to main content Missions Search All NASA MissionsA to Z List of MissionsUpcoming Launches and LandingsSpaceships and RocketsCommunicating with MissionsArtemisJames Webb Space TelescopeHubble Space TelescopeInternational Space StationOSIRIS-RExHumans in Space Why Go to SpaceAstronautsCommercial SpaceDestinationsSpaceships and RocketsLiving in SpaceEarth &amp; Climate Explore Earth ScienceClimate ChangeEarth, Our PlanetEarth Science in ActionEarth MultimediaEarth DataEarth Science ResearchersAbout NASA NASA's ImpactsCenters and FacilitiesDirectoratesOrganizationsPeople of NASACareersInternshipsOur HistoryDoing Business with NASAGet InvolvedContactLearning Resources For Kids and StudentsFor EducatorsFor Colleges and UniversitiesFor ProfessionalsScience for EveryoneSpace Samples for LearningRequest an Exhibit or SpeakerSTEM Engagement at NASAAeronautics Science in the AirNASA AircraftFlight InnovationSupersonic FlightAir Traffic SolutionsGreen Aviation TechDrones & YouTechnology Technology Transfer & SpinoffsSpace Travel TechnologyTechnology Living in SpaceManufacturing and MaterialsRoboticsScience InstrumentsComputingThe Universe ExoplanetsThe Search for Life in the UniverseStarsGalaxiesBlack HolesThe Big BangDark Matter &amp; Dark EnergyThe Solar System The SunMercuryVenusEarthThe MoonMarsJupiterSaturnUranusNeptunePluto &amp; Dwarf PlanetsAsteroids, Comets &amp; MeteorsThe Kuiper BeltThe Oort CloudSkywatchingEspañol CienciaAeronáuticaCiencias TerrestresSistema SolarUniversoScience All NASA ScienceEarth SciencePlanetary ScienceAstrophysics & Space ScienceThe Sun & HeliophysicsBiological & Physical SciencesLunar ScienceCitizen ScienceAstromaterialsAeronautics ResearchHuman Space
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