Question: Which was launched first, the Swedish satellite Odin or the Herschel Space Observatory?
Context: (15874) 1996 TL (also written (15874) 1996 TL66) is a trans-Neptunian object (TNO) that resides in the scattered disc.  The Spitzer Space Telescope has estimated this object to be about 575 km in diameter, but 2012 estimates from the Herschel Space Observatory estimate the diameter as closer to 339 km .  It is not a detached object, since its perihelion (closest approach to the Sun) is under the influence of Neptune.  Light-curve-amplitude analysis suggests that it is a spheroid.  Tancredi presents "in the form of a decision tree, the set of questions to be considered in order to classify an object as an icy 'dwarf planet'."  They find that (15874) 1996 TL is very probably a dwarf planet.  Mike Brown's website, using a radiometrically determined diameter of 344 km , lists it as a possible dwarf planet. The Infrared Science Archive (IRSA) curates the science products of NASA's infrared and submillimeter projects, such as the Spitzer Space Telescope, the Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite (IRAS), and the Two Micron All-Sky Survey (2MASS).  IRSA also serves data from infrared and submillimeter European Space Agency missions with NASA participation, including the Infrared Space Observatory (ISO), Planck, and the Herschel Space Observatory.  s of 2014 , IRSA provides access to more than 20 billion astronomical measurements, including all-sky coverage in 20 bands, spanning wavelengths from 1 micron to 10 millimeters.  Approximately 10% of all refereed astronomical journal articles cite data sets curated by IRSA. FREJA was a Swedish satellite developed by the Swedish Space Corporation on behalf of the Swedish National Space Board.  It was piggyback launched on a Long March 2C launch vehicle from Jiuquan Satellite Launch Center in China on October 6, 1992.  The satellite total cost was 19 million U.S. dollars, excluding the costs for experiments. The K.U. Observatory or Karachi University Observatory is located in the campus area of Karachi University.  The KU space observatory is operated by the Institute of Space and Planetary Astrophysics and stands majestically atop a hill and surprisingly, was built to last.  The space observatory was last built in 1995 as a part of Higher Education Commission of Pakistan.  The KU Observatory can resist all seismological challenges as its pillars go 15 feet deep into the ground.  The telescope has a motor that keeps pace with the movement of the earth making any object under view always visible without any readjustments. The Newbrook Observatory (a designated historic building) was built in Newbrook, Alberta, Canada by the Stellar Physics Division of the Dominion Observatory and operated as a space observatory from 1952 until 1957 The observatory was equipped with a Super-Schmidt Meteor Camera, one of only six built by the Perkin-Elmer Company used to observe meteors.  One of the observatory resident scientists, Art Griffen, was the first in North America to photograph the Sputnik 1 satellite (less than a week after its launch). Pillars of Creation is a photograph taken by the Hubble Space Telescope of elephant trunks of interstellar gas and dust in the Eagle Nebula, some 6,500-7,000 light years from Earth.  They are so named because the gas and dust are in the process of creating new stars, while also being eroded by the light from nearby stars that have recently formed.  Taken on April 1, 1995, it was named one of the top ten photographs from Hubble by Space.com.  The astronomers responsible for the photo were Jeff Hester and Paul Scowen from Arizona State University.  The region was rephotographed by ESA's Herschel Space Observatory in 2011, and again by the Hubble in 2014 (see below). HD 95086 b is a confirmed, directly imaged exoplanet orbiting the young, 17 Myr A-class pre-main-sequence star HD 95086.  It is roughly 5 times as massive as Jupiter and orbits 56–61 AU away from the parent star.  It was detected at thermal infrared wavelengths (3.8 µm) through direct imaging, using the NACO instrument on the VLT.  A debris disk has been detected in this system at submillimeter wavelengths and has been resolved in the far-infrared from data obtained with the Herschel Space Observatory. The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) is a submillimeter telescope that hangs from a high-altitude balloon.  It has a 2-meter primary mirror that directs light into bolometer arrays operating at 250, 350, and 500 µm.  These arrays were developed for the SPIRE instrument on the Herschel Space Observatory.  The project is carried out by a multi-university consortium headed by the University of Pennsylvania and which also includes University of Toronto, Brown University, the University of Miami, the University of British Columbia, JPL, INAOE, and Cardiff University.  The third flight of BLAST in Antarctica was a scientific success, but much of telescope was destroyed after landing.  It has been rebuilt for a flight from Antarctica in the 2010-11 austral summer.  This most recent flight of BLAST (aka BLAST-Pol) has a polarimeter to observe the polarized light from star forming cores.  The light is polarized due to magnetic fields.  It is thought that the magnetic fields inhibit the collapse of the cores.  The Herschel Space Observatory does not have a polarimeter. The Herschel Space Observatory was a space observatory built and operated by the European Space Agency (ESA).  It was active from 2009 to 2013, and was the largest infrared telescope ever launched, carrying a 3.5 m mirror and instruments sensitive to the far infrared and submillimetre wavebands (55–672 µm).  "Herschel" was the fourth and final cornerstone mission in the Horizon 2000 programme, following "SOHO"/"Cluster II", "XMM-Newton" and "Rosetta".  NASA is a partner in the "Herschel" mission, with US participants contributing to the mission; providing mission-enabling instrument technology and sponsoring the NASA Herschel Science Center (NHSC) at the Infrared Processing and Analysis Center and the Herschel Data Search at the Infrared Science Archive. Odin is a Swedish satellite working in two disciplines: astrophysics and aeronomy, and it was named after Odin of Norse mythology.  Within the field of astrophysics, Odin was used until the spring of 2007 aiding in the study of star formation.  Odin is still used for aeronomical observations, including exploration of the depletion of the ozone layer and effects of global warming.  In February 2016 it celebrated 15 years in Earth orbit, and was still functioning nominally.
Answer: Odin