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: 2 days ago
TLE from 2 days ago
0 STARLINK-3172
1 51139U 22005AM 26171.44847593 .00000299 00000-0 36903-4 0 9994
2 51139 53.1583 197.7110 0001044 81.1123 278.9987 15.08831179244257Epoch: 2026-06-20T10:45Z
TLE epoch observation values (Epoch: 2026-06-20T10:45:48.320Z)
Latitude
0.00002°
Longitude
127.59673°
Altitude
540.549 km
Speed
7.593 km/s
True Right ascension
13h 10m 50s
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
23:19:30
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
540.747 km
Perigee altitude
539.302 km
Semi-major axis
6,918.162 km
Eccentricity
0.0001
Inclination
53.1583°
RAAN
197.711°
Arg. of periapsis
81.1123°
True anomaly
278.98688°
Mean anomaly
278.9987°
Eccentric anomaly
278.99279°
Mean motion
3.77187 °/min
Orbital period
95.44 mins
BSTAR
0.000036903
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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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-06-23 02:31:11.666Z | 150.771° SSE | 2026-06-23 02:32:11.666Z | 132.991° SE | 16.661° | 2026-06-23 02:35:11.666Z | 84.911° E |
| 6 mins | 2026-06-23 04:09:11.666Z | 247.786° W | 2026-06-23 04:11:11.666Z | 298.665° NW | 41.006° | 2026-06-23 04:15:11.666Z | 44.009° NE |
| 4 mins | 2026-06-23 05:50:11.666Z | 318.918° NNW | 2026-06-23 05:51:11.666Z | 336.815° NNW | 16.653° | 2026-06-23 05:54:11.666Z | 24.934° NE |
| 4 mins | 2026-06-23 09:11:11.666Z | 352.133° N | 2026-06-23 09:13:11.666Z | 37.192° NE | 22.005° | 2026-06-23 09:15:11.666Z | 72.666° E |
| 6 mins | 2026-06-23 10:50:11.666Z | 298.424° NW | 2026-06-23 10:52:11.666Z | 237.241° WSW | 42.145° | 2026-06-23 10:56:11.666Z | 141.833° SSE |
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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