STARLINK-3172, 51139
Orbit data source: Space-Track
STARLINK-3172, 51139 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Wed, 19 Jan 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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51139 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: 8 hours ago
TLE from 8 hours ago
0 STARLINK-3172
1 51139U 22005AM 26094.27878835 -.00000623 00000-0 -21060-4 0 9993
2 51139 53.2160 184.2599 0001471 98.7983 261.3175 15.08837238232606Epoch: 2026-04-04T06:41Z
TLE epoch observation values (Epoch: 2026-04-04T06:41:27.313Z)
Latitude
-0.00008°
Longitude
-108.70482°
Altitude
540.803 km
Speed
7.593 km/s
True Right ascension
12h 17m 02s
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
20:30:00
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
541.015 km
Perigee altitude
538.979 km
Semi-major axis
6,918.134 km
Eccentricity
0.00015
Inclination
53.216°
RAAN
184.2599°
Arg. of periapsis
98.7983°
True anomaly
261.30084°
Mean anomaly
261.3175°
Eccentric anomaly
261.30917°
Mean motion
3.7719 °/min
Orbital period
95.44 mins
BSTAR
-0.00002106
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Other satellites on launch #5 in the year 2022 (2022-01-19 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-3172 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 | 2026-04-04 15:06:46.400Z | 319.47° NNW | 2026-04-04 15:10:46.400Z | 45.535° ENE | 36.486° | 2026-04-04 15:13:46.400Z | 107.052° ESE |
| 5 mins | 2026-04-04 16:47:46.400Z | 269.316° W | 2026-04-04 16:49:46.400Z | 228.778° WSW | 21.602° | 2026-04-04 16:52:46.400Z | 178.875° S |
| 6 mins | 2026-04-05 08:18:46.400Z | 211.949° SW | 2026-04-05 08:20:46.400Z | 161.561° S | 41.485° | 2026-04-05 08:24:46.400Z | 55.865° ENE |
| 5 mins | 2026-04-05 09:58:46.400Z | 295.067° NW | 2026-04-05 10:00:46.400Z | 337.236° NNW | 22.538° | 2026-04-05 10:03:46.400Z | 28.586° NE |
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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