STARLINK-5861, 55921
Orbit data source: Space-Track
STARLINK-5861, 55921 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Fri, 17 Mar 2023 UTC via an FALCON 9 launch vehicle from the Air Force Western Test Range (AFWTR). 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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55921 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
11.087 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 7 hours ago
TLE from 7 hours ago
0 STARLINK-5861
1 55921U 23037H 25349.87398113 -.00000058 00000-0 29449-5 0 9997
2 55921 69.9989 155.7333 0002858 271.3772 88.7060 14.98330089150935Epoch: 2025-12-15T20:58Z
TLE epoch observation values (Epoch: 2025-12-15T20:58:31.969Z)
Latitude
0°
Longitude
116.33381°
Altitude
574.435 km
Speed
7.574 km/s
True Right ascension
10h 22m 55s
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
03:06:49
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
571.99 km
Perigee altitude
568.018 km
Semi-major axis
6,948.141 km
Eccentricity
0.00029
Inclination
69.9989°
RAAN
155.7333°
Arg. of periapsis
271.3772°
True anomaly
88.73874°
Mean anomaly
88.706°
Eccentric anomaly
88.72237°
Mean motion
3.74749 °/min
Orbital period
96.06 mins
BSTAR
0.0000029449
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Other satellites on launch #37 in the year 2023 (2023-03-17 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-5861 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 | 2025-12-16 11:31:59.921Z | 132.836° SE | 2025-12-16 11:33:59.921Z | 103.377° ESE | 13.789° | 2025-12-16 11:35:59.921Z | 73.456° E |
| 6 mins | 2025-12-16 13:08:59.921Z | 229.916° WSW | 2025-12-16 13:11:59.921Z | 301.091° NW | 35.619° | 2025-12-16 13:14:59.921Z | 7.315° NNE |
| 5 mins | 2025-12-16 21:33:59.921Z | 11.692° NNE | 2025-12-16 21:35:59.921Z | 56.503° ENE | 27.192° | 2025-12-16 21:38:59.921Z | 115.775° SE |
| 4 mins | 2025-12-16 23:12:59.921Z | 278.798° WNW | 2025-12-16 23:13:59.921Z | 259.019° W | 19.957° | 2025-12-16 23:16:59.921Z | 208.79° SW |
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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Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
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