Norad ID: 21949
| Nazwa w katalogu Spacetrack | USA 81 |
| Wyniesienie na orbitę |
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| Deorbitacja |
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| Kraj/organizacja pochodzenia | USA (US) |
| Miejsce startu | AFWTR (Vandenberg Air Force Base, USA) |
| Perygeum | 785 km |
| Apogeum | 789 km |
USA 81, 21949 is a payload satellite owned by NRO (US) in LEO that was launched on Sat, 25 Apr 1992 UTC via a TITAN II SLV launch vehicle from the Air Force Western Test Range (AFWTR). Payloads include a variety of satellites, spacecraft, and rockets equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
Satelitę USA 81 wyniesiono 25.04.1992r.