Norad ID: 17506
| Spacetrack Directory Name | USA 21 |
| 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 | 1666 km |
| Apogee | 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.
satellite USA 21 Date of exalting 12.02.1987y.