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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
21775 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
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 25358.20157167 -.00000006 00000-0 00000-0 0 9994
2 21775 63.3655 282.2409 3358423 272.9105 49.9402 5.53395290 32872Epoch: 2025-12-24T04:50Z
TLE epoch observation values (Epoch: 2025-12-24T04:50:15.792Z)
Latitude
0.00002°
Longitude
116.69493°
Altitude
5,404.991 km
Speed
6.176 km/s
True Right ascension
18h 48m 56s
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
10:22:41
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
11,656.555 km
Perigee altitude
2,588.4 km
Semi-major axis
13,500.615 km
Eccentricity
0.33584
Inclination
63.3655°
RAAN
282.2409°
Arg. of periapsis
272.9105°
True anomaly
87.18864°
Mean anomaly
49.9402°
Eccentric anomaly
67.74974°
Mean motion
1.38361 °/min
Orbital period
260.19 mins
BSTAR
0
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #76 in the year 1991 (1991-11-08 UTC)
Did you know?
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
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 116 mins | 2025-12-31 18:55:41.972Z | 184.057° SSW | 2025-12-31 19:30:41.972Z | 105.245° ESE | 43.543° | 2025-12-31 20:51:41.972Z | 36.995° NE |
| 148 mins | 2025-12-31 23:37:41.972Z | 269.913° W | 2026-01-01 00:47:41.972Z | 358.637° N | 39.234° | 2026-01-01 02:05:41.972Z | 90.48° ESE |
| 121 mins | 2026-01-01 04:47:41.972Z | 322.5° NNW | 2026-01-01 06:09:41.972Z | 254.271° W | 43.911° | 2026-01-01 06:48:41.972Z | 174.026° 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 |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|