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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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: 9 hours ago
TLE from 9 hours ago
0 USA 76
1 21808U 91076D 26060.16821257 .00004927 00000-0 39734-3 0 9999
2 21808 63.2983 82.5863 0887006 72.4733 297.1162 13.58419298 91355Epoch: 2026-03-01T04:02Z
TLE epoch observation values (Epoch: 2026-03-01T04:02:13.566Z)
Latitude
-0.00004°
Longitude
-136.95009°
Altitude
792.202 km
Speed
7.583 km/s
True Right ascension
05h 30m 20s
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
16:23:12
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,698.279 km
Perigee altitude
382.246 km
Semi-major axis
7,418.4 km
Eccentricity
0.0887
Inclination
63.2983°
RAAN
82.5863°
Arg. of periapsis
72.4733°
True anomaly
287.63238°
Mean anomaly
297.1162°
Eccentric anomaly
292.41811°
Mean motion
3.39686 °/min
Orbital period
105.98 mins
BSTAR
0.00039734
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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 | 2026-03-01 13:26:19.631Z | 276.694° WNW | 2026-03-01 13:28:19.631Z | 247.23° WSW | 18.483° | 2026-03-01 13:32:19.631Z | 200.72° SSW |
| 5 mins | 2026-03-02 03:09:19.631Z | 205.001° SW | 2026-03-02 03:12:19.631Z | 79.481° E | 42.201° | 2026-03-02 03:14:19.631Z | 40.483° NE |
| 5 mins | 2026-03-02 10:34:19.631Z | 17.268° NNE | 2026-03-02 10:36:19.631Z | 53.26° ENE | 17.602° | 2026-03-02 10:39:19.631Z | 92.172° ESE |
| 8 mins | 2026-03-02 12:22:19.631Z | 307.111° NW | 2026-03-02 12:25:19.631Z | 236.021° WSW | 37.4° | 2026-03-02 12:30:19.631Z | 166.318° S |
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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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