USA 77, 21809
Orbit data source: Space-Track
USA 77, 21809 is an American payload satellite in LEO that was launched on Fri, 08 Nov 1991 UTC via a TITAN 403A 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.
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21809 intel report (Beta)
USA 77 details
| Identifier | |
| Orbit | LEO |
| Last TLE update | 9 hours ago |
| Origin | |
| Manufacturer | NRL |
| Mission | Defense Sigint |
| Bus & Motor | NOSS B SSU, Unknown motor |
| Mass | ~400 kg wet, ~400 kg dry |
| Launch date (UTC) | |
| Launch vehicle | |
| Launch site | |
| Object type | Payload Rocket body Debris |
| Shape & HBR | Cyl, 1 m |
| Radar Cross Section | 1.178 m², Large (>1 m²) |
Expand to show TLE details & history
TLE from 9 hours ago
0 USA 77
1 21809U 91076E 24361.16422938 .00004041 00000-0 38370-3 0 9997
2 21809 63.3010 148.6438 0901337 64.5571 304.5925 13.51373569 31410Epoch: 2024-12-26T03:56Z
Definitive object data (Epoch: 2024-12-26T03:56:29.418Z)
| Latitude | -0.00006° |
| Longitude | -5.62636° |
| Altitude | 732.119 km |
| Speed | 7.657 km/s |
| True Right ascension | 09h 54m 34s |
| True Declination | 0° 00' 00" |
| Sunlit | Object was in full shadow at TLE epoch |
Visualization TLE readout
| Latitude | 41.59074° |
| Longitude | 19.72118° |
| Altitude | 424.714 km |
| Speed | 7.987 km/s |
| Apparent Right ascension | 06h 42m 36s |
| Apparent Declination | 22° 00' 53" |
| Sunlit | Object is in full shadow |
Visualization observer readout
| Local Sidereal Time | 12:23:10 |
| Azimuth | 284.396° WNW |
| Elevation | 17.503° |
| Doppler factor | 1 |
Orbital elements
| Apogee altitude | 1,737.004 km |
| Perigee altitude | 395.062 km |
| Semi-major axis | 7,444.17 km |
| Eccentricity | 0.0901337 |
| Inclination | 63.301° |
| RAAN | 148.6438° |
| Arg. of periapsis | 64.5571° |
| True anomaly | 295.54859° |
| Mean anomaly | 304.5925° |
| Eccentric anomaly | 300.12578° |
| Mean motion | 3.37924 °/min |
| BSTAR | 0.0003837 |
| Orbital period | 106.53 mins |
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Other satellites on launch #76 in the year 1991 (1991-11-08 UTC)
USA 77 Visibility forecast
Observer location: undefined°, undefined
Span | Click to sort rows by Start time (UTC) header in descending order | Start Az. | Max El. time (UTC) | Max El. Az. | Max El. | End time (UTC) | End Az. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2024-12-26 20:26:33.402Z | 337.692° N | 2024-12-26 20:29:33.402Z | 79.722° E | 42.469° | 2024-12-26 20:34:33.402Z | 137.598° SSE |
| 5 mins | 2024-12-26 22:17:33.402Z | 262.583° W | 2024-12-26 22:19:33.402Z | 237.781° WSW | 16.037° | 2024-12-26 22:22:33.402Z | 209.577° SW |
| 5 mins | 2024-12-27 12:04:33.402Z | 228.305° WSW | 2024-12-27 12:06:33.402Z | 294.803° NW | 41.229° | 2024-12-27 12:09:33.402Z | 26.788° NE |
Authenticating...
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