User:Marstead/sandbox
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The Fermi Gamma-ray Space Telescope (FGST[2]), formerly called the Gamma-ray Large Area Space Telescope (GLAST), is a space observatory being used to perform gamma-ray astronomy observations from low Earth orbit. Its main instrument is the Large Area Telescope (LAT), with which astronomers mostly intend to perform an all-sky survey studying astrophysical and cosmological phenomena such as active galactic nuclei, pulsars, other high-energy sources and dark matter. Another instrument aboard Fermi, the Gamma-ray Burst Monitor (GBM; formerly GLAST Burst Monitor), is being used to study gamma-ray bursts.[3]
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Names | Gamma-ray Large Area Space Telescope |
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Mission type | Gamma-ray telescope |
Operator | NASA / U.S. Department of Energy with significant contributions by CNES, DLR, ISA, JAXA, and SNSB |
COSPAR ID | 2008-029A |
SATCAT no. | 33053 |
Website | fermi.gsfc.nasa.gov/ |
Mission duration | Planned: 5-10 years Elapsed: 16 years, 1 month and 16 days |
Orbits completed | 36496[1] |
Spacecraft properties | |
Manufacturer | General Dynamics |
Start of mission | |
Launch date | 11 June 2008, 16:05 UTC (2008-06-11UTC16:05Z) |
Rocket | Delta II 7920-H #333 |
Launch site | Cape Canaveral SLC-17B |
Orbital parameters | |
Reference system | Geocentric |
Regime | Low Earth |
Semi-major axis | 6,916.16 km (4,297.50 mi)[1] |
Eccentricity | 0.0012564[1] |
Perigee altitude | 536 km (333 mi)[1] |
Apogee altitude | 553 km (344 mi)[1] |
Inclination | 25.58 degrees[1] |
Period | 95.40 minutes[1] |
RAAN | 189.97 degrees[1] |
Argument of perigee | 256.57 degrees[1] |
Mean anomaly | 15.09 degrees[1] |
Mean motion | 15.09[1] |
Velocity | 7.59 km/s (27,300 km/h; 17,000 mph)[1] |
Epoch | 24 January 2015, 17:45:50 UTC[1] |
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Fermi was launched on 11 June 2008 at 16:05 UTC aboard a Delta II 7920-H rocket. The mission is a joint venture of NASA, the United States Department of Energy, and government agencies in France, Germany, Italy, Japan, and Sweden.[4]