STARLINK-5508, 55639
Orbit data source: Space-Track
STARLINK-5508, 55639 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Fri, 17 Feb 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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55639 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: 2 days ago
TLE from 2 days ago
0 STARLINK-5508
1 55639U 23021M 26171.44601174 -.00000572 00000-0 -40123-4 0 9990
2 55639 69.9993 285.3543 0003402 262.9595 97.1177 14.98336294184185Epoch: 2026-06-20T10:42Z
TLE epoch observation values (Epoch: 2026-06-20T10:42:15.414Z)
Latitude
-0.00004°
Longitude
-143.87046°
Altitude
574.754 km
Speed
7.574 km/s
True Right ascension
19h 01m 25s
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
21:44:32
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
572.348 km
Perigee altitude
567.621 km
Semi-major axis
6,948.122 km
Eccentricity
0.00034
Inclination
69.9993°
RAAN
285.3543°
Arg. of periapsis
262.9595°
True anomaly
97.15638°
Mean anomaly
97.1177°
Eccentric anomaly
97.13704°
Mean motion
3.7475 °/min
Orbital period
96.06 mins
BSTAR
-0.000040123
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Other satellites on launch #21 in the year 2023 (2023-02-17 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-5508 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 | 2026-06-22 17:43:29.296Z | 358.956° N | 2026-06-22 17:46:29.296Z | 59.777° ENE | 29.723° | 2026-06-22 17:49:29.296Z | 120.657° SE |
| 5 mins | 2026-06-23 07:44:29.296Z | 146.508° SSE | 2026-06-23 07:46:29.296Z | 108.515° ESE | 22.145° | 2026-06-23 07:49:29.296Z | 56.147° ENE |
| 5 mins | 2026-06-23 09:22:29.296Z | 254.923° W | 2026-06-23 09:24:29.296Z | 294.234° NW | 24.817° | 2026-06-23 09:27:29.296Z | 353.871° N |
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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