STARLINK-3399, 51121
Orbit data source: Space-Track
STARLINK-3399, 51121 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Wed, 19 Jan 2022 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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51121 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
297 kg wet, ~275 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: 2 days ago
TLE from 2 days ago
0 STARLINK-3399
1 51121U 22005T 26171.34267260 .00000063 00000-0 22058-4 0 9996
2 51121 53.1584 188.1880 0001192 86.9675 273.1453 15.08832296244375Epoch: 2026-06-20T08:13Z
TLE epoch observation values (Epoch: 2026-06-20T08:13:26.912Z)
Latitude
-0.00001°
Longitude
156.26719°
Altitude
540.613 km
Speed
7.593 km/s
True Right ascension
12h 32m 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
21:46:00
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
540.846 km
Perigee altitude
539.197 km
Semi-major axis
6,918.158 km
Eccentricity
0.00012
Inclination
53.1584°
RAAN
188.188°
Arg. of periapsis
86.9675°
True anomaly
273.13166°
Mean anomaly
273.1453°
Eccentric anomaly
273.13848°
Mean motion
3.77188 °/min
Orbital period
95.44 mins
BSTAR
0.000022058
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Other satellites on launch #5 in the year 2022 (2022-01-19 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-3399 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 | 2026-06-22 11:39:57.393Z | 270.011° WNW | 2026-06-22 11:41:57.393Z | 239.481° WSW | 15.314° | 2026-06-22 11:43:57.393Z | 205.676° SW |
| 6 mins | 2026-06-23 03:10:57.393Z | 229.984° WSW | 2026-06-23 03:13:57.393Z | 38.066° NE | 44.649° | 2026-06-23 03:16:57.393Z | 49.5° ENE |
| 4 mins | 2026-06-23 04:51:57.393Z | 306.932° NW | 2026-06-23 04:53:57.393Z | 346.337° N | 19.087° | 2026-06-23 04:55:57.393Z | 20.322° NNE |
| 4 mins | 2026-06-23 08:12:57.393Z | 346.391° N | 2026-06-23 08:14:57.393Z | 24.076° NE | 19.12° | 2026-06-23 08:16:57.393Z | 60.005° ENE |
| 6 mins | 2026-06-23 09:51:57.393Z | 311.243° NW | 2026-06-23 09:54:57.393Z | 116.731° SE | 44.122° | 2026-06-23 09:57:57.393Z | 129.473° SE |
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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