USA 76, 21808
Orbit data source: Space-Track
USA 76, 21808 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). Payload-class satellites include a variety of spacecraft 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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21808 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
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
Shape & HBR
Cyl, 0.5 m
Radar Cross Section
1.178 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 11 hours ago
TLE from 11 hours ago
0 USA 76
1 21808U 91076D 25256.24506595 .00005889 00000-0 50088-3 0 9992
2 21808 63.3010 174.1702 0890273 69.3662 300.0486 13.56183324 68424Epoch: 2025-09-13T05:52Z
TLE epoch observation values (Epoch: 2025-09-13T05:52:53.698Z)
Latitude
-0.00002°
Longitude
93.46525°
Altitude
767.246 km
Speed
7.613 km/s
True Right ascension
11h 36m 40s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
09:37:28
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,709.583 km
Perigee altitude
387.251 km
Semi-major axis
7,426.554 km
Eccentricity
0.08903
Inclination
63.301°
RAAN
174.1702°
Arg. of periapsis
69.3662°
True anomaly
290.73953°
Mean anomaly
300.0486°
Eccentric anomaly
295.44241°
Mean motion
3.39127 °/min
Orbital period
106.15 mins
BSTAR
0.00050088
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Other satellites on launch #76 in the year 1991 (1991-11-08 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.USA 76 Visibility forecast
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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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2025-09-13 20:10:11.167Z | 193.202° SSW | 2025-09-13 20:13:11.167Z | 142.92° SSE | 33.266° | 2025-09-13 20:16:11.167Z | 50.671° ENE |
| 8 mins | 2025-09-14 05:25:11.167Z | 315.177° NNW | 2025-09-14 05:28:11.167Z | 204.547° SW | 42.316° | 2025-09-14 05:33:11.167Z | 156.337° SSE |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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