Norad ID: 21949
| Spacetrack Directory Name | USA 81 |
| Orbit launches |
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| Deorbitation |
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| Country/organisation of origin | USA (US) |
| Starting point | AFWTR (Vandenberg Air Force Base, USA) |
| Perigee | 785 km |
| Apogee | 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.
satellite USA 81 Date of exalting 25.04.1992y.