Norad ID: 17506
| Nazwa w katalogu Spacetrack | USA 21 |
| 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 | 1666 km |
| Apogeum | 38695 km |
USA 21, 17506 is an American payload satellite that was launched on Thu, 12 Feb 1987 UTC via a TITAN 34B 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 21 wyniesiono 12.02.1987r.