STARLINK-2739, 48639
Orbit data source: Space-Track
STARLINK-2739, 48639 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Wed, 26 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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48639 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: 22 hours ago
TLE from 22 hours ago
0 STARLINK-2739
1 48639U 21044B 25348.78737066 -.00011394 00000-0 -74744-3 0 9996
2 48639 53.0535 137.7699 0001231 87.4552 272.6578 15.06390496250987Epoch: 2025-12-14T18:53Z
TLE epoch observation values (Epoch: 2025-12-14T18:53:48.825Z)
Latitude
0.00001°
Longitude
130.6212°
Altitude
548.08 km
Speed
7.589 km/s
True Right ascension
09h 11m 04s
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
15:07:32
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
548.364 km
Perigee altitude
546.659 km
Semi-major axis
6,925.649 km
Eccentricity
0.00012
Inclination
53.0535°
RAAN
137.7699°
Arg. of periapsis
87.4552°
True anomaly
272.64371°
Mean anomaly
272.6578°
Eccentric anomaly
272.65075°
Mean motion
3.76576 °/min
Orbital period
95.6 mins
BSTAR
-0.00074744
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Other satellites on launch #44 in the year 2021 (2021-05-26 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-2739 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 | 2025-12-15 17:37:41.246Z | 345.226° N | 2025-12-15 17:39:41.246Z | 20.026° NNE | 17.142° | 2025-12-15 17:41:41.246Z | 53.504° ENE |
| 6 mins | 2025-12-15 19:17:41.246Z | 323.281° NNW | 2025-12-15 19:19:41.246Z | 32.173° NE | 41.848° | 2025-12-15 19:23:41.246Z | 119.106° SE |
| 6 mins | 2025-12-16 12:29:41.246Z | 226.869° WSW | 2025-12-16 12:31:41.246Z | 210.3° SW | 44.465° | 2025-12-16 12:35:41.246Z | 51.052° ENE |
| 4 mins | 2025-12-16 14:10:41.246Z | 313.239° NW | 2025-12-16 14:11:41.246Z | 333.703° NNW | 20.162° | 2025-12-16 14:14:41.246Z | 25.588° 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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