STARLINK-5739, 55571
Orbit data source: Space-Track
STARLINK-5739, 55571 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Sun, 12 Feb 2023 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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55571 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
305 kg wet, ~290 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: 1 day ago
TLE from 1 day ago
0 STARLINK-5739
1 55571U 23020C 25338.54709156 .00000425 00000-0 46508-4 0 9996
2 55571 43.0015 161.9396 0001103 270.8489 89.2227 15.02537032154600Epoch: 2025-12-04T13:07Z
TLE epoch observation values (Epoch: 2025-12-04T13:07:48.710Z)
Latitude
-0.00003°
Longitude
-108.61536°
Altitude
558.844 km
Speed
7.584 km/s
True Right ascension
10h 47m 45s
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
13:18:07
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
561.765 km
Perigee altitude
560.235 km
Semi-major axis
6,939.137 km
Eccentricity
0.00011
Inclination
43.0015°
RAAN
161.9396°
Arg. of periapsis
270.8489°
True anomaly
89.23534°
Mean anomaly
89.2227°
Eccentric anomaly
89.22902°
Mean motion
3.75478 °/min
Orbital period
95.88 mins
BSTAR
0.000046508
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Other satellites on launch #20 in the year 2023 (2023-02-12 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-5739 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 | 2025-12-05 16:29:52.684Z | 248.665° W | 2025-12-05 16:33:52.684Z | 84.154° E | 43.973° | 2025-12-05 16:36:52.684Z | 72.463° E |
| 6 mins | 2025-12-05 18:11:52.684Z | 287.09° WNW | 2025-12-05 18:14:52.684Z | 27.067° NE | 38.107° | 2025-12-05 18:17:52.684Z | 75.168° E |
| 6 mins | 2025-12-05 19:52:52.684Z | 290.457° WNW | 2025-12-05 19:54:52.684Z | 308.917° NW | 43.185° | 2025-12-05 19:58:52.684Z | 104.456° ESE |
| 5 mins | 2025-12-05 21:33:52.684Z | 255.782° W | 2025-12-05 21:35:52.684Z | 209.358° SW | 26.412° | 2025-12-05 21:38:52.684Z | 155.804° SSE |
| 5 mins | 2025-12-06 14:47:52.684Z | 197.862° SSW | 2025-12-06 14:49:52.684Z | 154.192° SSE | 28.11° | 2025-12-06 14:52:52.684Z | 91.491° ESE |
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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