USA 72, 21775
Orbit data source: Space-Track
USA 72, 21775 is an American payload satellite in HEO 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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21775 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Defense Sigint
Bus & Motor
NOSS B, Unknown motor
Mass
~3,000 kg wet, ~3,000 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl, 0.5 m
Radar Cross Section
1.178 m²
Expand to show TLE details & historyLast TLE update: 1 week ago
TLE from 1 week ago
0 USA 72
1 21775U 91076A 25280.31886541 -.00000014 00000-0 00000-0 0 9994
2 21775 63.3862 314.3361 3365464 272.7819 49.9531 5.53396024 28569Epoch: 2025-10-07T07:39Z
TLE epoch observation values (Epoch: 2025-10-07T07:39:09.971Z)
Latitude
-0.00018°
Longitude
-176.65406°
Altitude
5,410.16 km
Speed
6.174 km/s
True Right ascension
20h 57m 23s
True Declination
0° 00' 01"
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
02:50:46
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
11,666.042 km
Perigee altitude
2,578.885 km
Semi-major axis
13,500.6 km
Eccentricity
0.33655
Inclination
63.3862°
RAAN
314.3361°
Arg. of periapsis
272.7819°
True anomaly
87.29618°
Mean anomaly
49.9531°
Eccentric anomaly
67.8073°
Mean motion
1.38361 °/min
Orbital period
260.19 mins
BSTAR
0
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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 72 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. |
|---|---|---|---|---|---|---|---|
| 48 mins | 2025-10-17 08:06:54.129Z | 40.055° NE | 2025-10-17 08:06:54.129Z | 40.055° NE | 36.211° | 2025-10-17 08:54:54.129Z | 86.655° E |
| 123 mins | 2025-10-17 11:36:54.129Z | 321.368° NNW | 2025-10-17 13:00:54.129Z | 250.371° W | 44.354° | 2025-10-17 13:39:54.129Z | 170.201° S |
| 29 mins | 2025-10-17 16:52:54.129Z | 317.883° NNW | 2025-10-17 17:06:54.129Z | 306.438° NW | 11.524° | 2025-10-17 17:21:54.129Z | 291.944° WNW |
| 84 mins | 2025-10-17 23:35:54.129Z | 124.837° SE | 2025-10-18 00:06:54.129Z | 73.713° E | 26.979° | 2025-10-18 00:59:54.129Z | 30.948° NE |
| 133 mins | 2025-10-18 03:53:54.129Z | 222.845° SW | 2025-10-18 04:34:54.129Z | 309.097° NW | 43.976° | 2025-10-18 06:06:54.129Z | 52.445° ENE |
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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