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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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: 3 days ago
TLE from 3 days ago
0 STARLINK-3635
1 51981U 22025AB 26170.62503628 -.00000020 00000-0 16828-4 0 9995
2 51981 53.1599 301.4044 0000984 84.6226 275.4878 15.08834795236443Epoch: 2026-06-19T15:00Z
TLE epoch observation values (Epoch: 2026-06-19T15:00:03.134Z)
Latitude
-0°
Longitude
168.54001°
Altitude
540.586 km
Speed
7.593 km/s
True Right ascension
20h 05m 37s
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
21:34:18
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
540.694 km
Perigee altitude
539.333 km
Semi-major axis
6,918.15 km
Eccentricity
0.0001
Inclination
53.1599°
RAAN
301.4044°
Arg. of periapsis
84.6226°
True anomaly
275.47658°
Mean anomaly
275.4878°
Eccentric anomaly
275.48219°
Mean motion
3.77188 °/min
Orbital period
95.44 mins
BSTAR
0.000016828
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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. |
|---|---|---|---|---|---|---|---|
| 7 mins | 2026-06-22 11:34:16.689Z | 260.879° W | 2026-06-22 11:38:16.689Z | 345.707° N | 30.335° | 2026-06-22 11:41:16.689Z | 35.612° NE |
| 5 mins | 2026-06-22 16:37:16.689Z | 341.354° N | 2026-06-22 16:39:16.689Z | 36.353° NE | 30.34° | 2026-06-22 16:42:16.689Z | 95.136° ESE |
| 5 mins | 2026-06-22 18:16:16.689Z | 280.205° WNW | 2026-06-22 18:18:16.689Z | 233.736° WSW | 29.172° | 2026-06-22 18:21:16.689Z | 168.833° S |
| 6 mins | 2026-06-23 09:47:16.689Z | 195.903° SSW | 2026-06-23 09:49:16.689Z | 153.548° SSE | 32.994° | 2026-06-23 09:53:16.689Z | 63.765° ENE |
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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