USA 74, 21799
Orbit data source: Space-Track
USA 74, 21799 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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21799 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 74
1 21799U 91076C 26060.17101754 .00006738 00000-0 50884-3 0 9993
2 21799 63.2948 74.3352 0885456 71.1341 298.3530 13.60147984 88907Epoch: 2026-03-01T04:06Z
TLE epoch observation values (Epoch: 2026-03-01T04:06:15.915Z)
Latitude
-0.00002°
Longitude
-146.21374°
Altitude
772.97 km
Speed
7.6 km/s
True Right ascension
04h 57m 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
16:22:40
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,690.284 km
Perigee altitude
377.665 km
Semi-major axis
7,412.111 km
Eccentricity
0.08855
Inclination
63.2948°
RAAN
74.3352°
Arg. of periapsis
71.1341°
True anomaly
288.97175°
Mean anomaly
298.353°
Eccentric anomaly
293.70786°
Mean motion
3.40119 °/min
Orbital period
105.85 mins
BSTAR
0.00050884
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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 74 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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2026-03-02 03:12:47.874Z | 241.654° WSW | 2026-03-02 03:14:47.874Z | 284.892° WNW | 30.602° | 2026-03-02 03:17:47.874Z | 15.758° NNE |
| 7 mins | 2026-03-02 10:36:47.874Z | 1.66° NNE | 2026-03-02 10:38:47.874Z | 51.329° ENE | 30.586° | 2026-03-02 10:43:47.874Z | 120.052° SE |
| 6 mins | 2026-03-02 12:25:47.874Z | 277.956° WNW | 2026-03-02 12:27:47.874Z | 242.67° WSW | 23.313° | 2026-03-02 12:31:47.874Z | 192.509° SSW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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