STARLINK-6121, 56129
Orbit data source: Space-Track
STARLINK-6121, 56129 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Wed, 29 Mar 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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56129 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
11.087 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 STARLINK-6121
1 56129U 23046AP 26171.22475647 .00000238 00000-0 18180-4 0 9997
2 56129 43.0026 236.6973 0001551 279.3475 80.7202 15.27576808178470Epoch: 2026-06-20T05:23Z
TLE epoch observation values (Epoch: 2026-06-20T05:23:38.959Z)
Latitude
0.00005°
Longitude
-112.65742°
Altitude
482.663 km
Speed
7.626 km/s
True Right ascension
15h 46m 47s
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
21:37:46
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
486.068 km
Perigee altitude
483.939 km
Semi-major axis
6,863.14 km
Eccentricity
0.00016
Inclination
43.0026°
RAAN
236.6973°
Arg. of periapsis
279.3475°
True anomaly
80.73774°
Mean anomaly
80.7202°
Eccentric anomaly
80.72897°
Mean motion
3.81732 °/min
Orbital period
94.31 mins
BSTAR
0.00001818
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Other satellites on launch #46 in the year 2023 (2023-03-29 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-6121 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 | 2026-06-22 11:08:44.292Z | 289.272° WNW | 2026-06-22 11:12:44.292Z | 55.961° ENE | 42.083° | 2026-06-22 11:15:44.292Z | 97.964° ESE |
| 4 mins | 2026-06-22 12:49:44.292Z | 254.108° W | 2026-06-22 12:50:44.292Z | 227.157° WSW | 28.447° | 2026-06-22 12:53:44.292Z | 151.323° SSE |
| 6 mins | 2026-06-23 07:23:44.292Z | 240.594° WSW | 2026-06-23 07:26:44.292Z | 110.511° ESE | 42.344° | 2026-06-23 07:29:44.292Z | 74.286° E |
| 5 mins | 2026-06-23 09:03:44.292Z | 290.963° WNW | 2026-06-23 09:05:44.292Z | 15.411° NNE | 37.929° | 2026-06-23 09:08:44.292Z | 72.402° 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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