STARLINK-3635, 51981
Orbit data source: Space-Track
STARLINK-3635, 51981 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Wed, 09 Mar 2022 UTC via an FALCON 9 launch vehicle from the Air Force Eastern Test Range (AFETR). 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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51981 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
SpaceX/Seattle
Mission
Operational Commercial Communications
Bus & Motor
STARLINK, Unknown motor
Mass
297 kg wet, ~275 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 1 Pan, 10.1 m
Radar Cross Section
13.562 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 23 hours ago
TLE from 23 hours ago
0 STARLINK-3635
1 51981U 22025AB 25346.64212679 -.00001058 00000-0 -48374-4 0 9998
2 51981 53.2198 69.8929 0001321 86.1428 273.9715 15.08839079207916Epoch: 2025-12-12T15:24Z
TLE epoch observation values (Epoch: 2025-12-12T15:24:39.754Z)
Latitude
-0.00005°
Longitude
117.1464°
Altitude
540.581 km
Speed
7.593 km/s
True Right ascension
04h 39m 34s
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
13:10:58
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
540.905 km
Perigee altitude
539.077 km
Semi-major axis
6,918.128 km
Eccentricity
0.00013
Inclination
53.2198°
RAAN
69.8929°
Arg. of periapsis
86.1428°
True anomaly
273.9564°
Mean anomaly
273.9715°
Eccentric anomaly
273.96395°
Mean motion
3.7719 °/min
Orbital period
95.44 mins
BSTAR
-0.000048374
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Other satellites on launch #25 in the year 2022 (2022-03-09 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.STARLINK-3635 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 | 2025-12-13 15:47:18.383Z | 294.289° NW | 2025-12-13 15:50:18.383Z | 222.945° SW | 35.543° | 2025-12-13 15:53:18.383Z | 156.915° SSE |
| 5 mins | 2025-12-14 07:19:18.383Z | 182.865° SSW | 2025-12-14 07:21:18.383Z | 139.333° SSE | 27.845° | 2025-12-14 07:24:18.383Z | 74.495° E |
| 6 mins | 2025-12-14 08:58:18.383Z | 268.665° W | 2025-12-14 09:01:18.383Z | 345.594° N | 30.388° | 2025-12-14 09:04:18.383Z | 35.52° NE |
| 5 mins | 2025-12-14 14:00:18.383Z | 341.81° N | 2025-12-14 14:02:18.383Z | 36.061° NE | 29.941° | 2025-12-14 14:05:18.383Z | 94.524° ESE |
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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