STARLINK-2139, 48554
Orbit data source: Space-Track
STARLINK-2139, 48554 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Sat, 15 May 2021 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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48554 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
260 kg wet, ~248 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-2139
1 48554U 21041B 25349.85309546 .00000691 00000-0 65271-4 0 9998
2 48554 53.0551 148.2820 0001384 92.1091 268.0056 15.06396998252563Epoch: 2025-12-15T20:28Z
TLE epoch observation values (Epoch: 2025-12-15T20:28:27.447Z)
Latitude
-0.00007°
Longitude
116.42188°
Altitude
548.133 km
Speed
7.589 km/s
True Right ascension
09h 53m 07s
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
17:42:40
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
548.45 km
Perigee altitude
546.533 km
Semi-major axis
6,925.628 km
Eccentricity
0.00014
Inclination
53.0551°
RAAN
148.282°
Arg. of periapsis
92.1091°
True anomaly
267.98975°
Mean anomaly
268.0056°
Eccentric anomaly
267.99768°
Mean motion
3.76578 °/min
Orbital period
95.6 mins
BSTAR
0.000065271
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Other satellites on launch #41 in the year 2021 (2021-05-15 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-2139 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 | 2025-12-16 19:13:27.539Z | 325.1° NNW | 2025-12-16 19:17:27.539Z | 43.14° NE | 27.885° | 2025-12-16 19:20:27.539Z | 92.955° ESE |
| 5 mins | 2025-12-16 20:54:27.539Z | 283.478° WNW | 2025-12-16 20:56:27.539Z | 232.322° WSW | 32.799° | 2025-12-16 20:59:27.539Z | 162.869° S |
| 5 mins | 2025-12-17 12:27:27.539Z | 184.485° SSW | 2025-12-17 12:29:27.539Z | 132.297° SE | 30.96° | 2025-12-17 12:32:27.539Z | 70.082° E |
| 6 mins | 2025-12-17 14:06:27.539Z | 272.711° WNW | 2025-12-17 14:09:27.539Z | 345.882° N | 28.923° | 2025-12-17 14:12:27.539Z | 34.952° 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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