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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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: 12 hours ago
TLE from 12 hours ago
0 STARLINK-5739
1 55571U 23020C 26263.93824452 -.00000170 00000-0 33495-5 0 9994
2 55571 43.0041 345.9448 0001103 273.4498 86.6227 15.27574219198738Epoch: 2026-09-20T22:31Z
TLE epoch observation values (Epoch: 2026-09-20T22:31:04.326Z)
Latitude
-0.00006°
Longitude
8.35147°
Altitude
482.798 km
Speed
7.626 km/s
True Right ascension
23h 03m 46s
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
03:12:34
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
485.768 km
Perigee altitude
484.254 km
Semi-major axis
6,863.148 km
Eccentricity
0.00011
Inclination
43.0041°
RAAN
345.9448°
Arg. of periapsis
273.4498°
True anomaly
86.63532°
Mean anomaly
86.6227°
Eccentric anomaly
86.62901°
Mean motion
3.81732 °/min
Orbital period
94.31 mins
BSTAR
0.0000033495
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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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2026-09-21 11:23:49.871Z | 281.857° WNW | 2026-09-21 11:26:49.871Z | 8.849° NNE | 51.57° | 2026-09-21 11:29:49.871Z | 71.592° E |
| 5 mins | 2026-09-21 13:03:49.871Z | 295.331° NW | 2026-09-21 13:05:49.871Z | 11.957° NNE | 68.878° | 2026-09-21 13:08:49.871Z | 96.096° ESE |
| 5 mins | 2026-09-21 14:42:49.871Z | 261.484° W | 2026-09-21 14:44:49.871Z | 203.798° SW | 35.277° | 2026-09-21 14:47:49.871Z | 145.059° SSE |
| 5 mins | 2026-09-22 09:17:49.871Z | 238.06° WSW | 2026-09-22 09:19:49.871Z | 156.184° SSE | 73.117° | 2026-09-22 09:22:49.871Z | 74.721° E |
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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