STARLINK-5539, 55747
Orbit data source: Space-Track
STARLINK-5539, 55747 is a payload satellite owned by SpaceX/Seattle (US) in LEO that was launched on Fri, 03 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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55747 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-5539
1 55747U 23028G 26171.20036831 .00003261 00000-0 28100-3 0 9999
2 55747 70.0009 346.0557 0002583 274.0959 85.9905 14.98323096181393Epoch: 2026-06-20T04:48Z
TLE epoch observation values (Epoch: 2026-06-20T04:48:31.821Z)
Latitude
-0.00003°
Longitude
5.5047°
Altitude
574.376 km
Speed
7.574 km/s
True Right ascension
23h 04m 13s
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
21:28:02
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
571.82 km
Perigee altitude
568.231 km
Semi-major axis
6,948.162 km
Eccentricity
0.00026
Inclination
70.0009°
RAAN
346.0557°
Arg. of periapsis
274.0959°
True anomaly
86.02003°
Mean anomaly
85.9905°
Eccentric anomaly
86.00526°
Mean motion
3.74747 °/min
Orbital period
96.06 mins
BSTAR
0.000281
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Other satellites on launch #28 in the year 2023 (2023-03-03 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-5539 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 13:02:02.214Z | 219.798° SW | 2026-06-22 13:05:02.214Z | 295.36° NW | 40.748° | 2026-06-22 13:09:02.214Z | 16.699° NNE |
| 5 mins | 2026-06-22 21:27:02.214Z | 15.259° NNE | 2026-06-22 21:29:02.214Z | 54.398° ENE | 22.804° | 2026-06-22 21:32:02.214Z | 108.096° ESE |
| 5 mins | 2026-06-22 23:05:02.214Z | 300.426° NW | 2026-06-22 23:07:02.214Z | 262.702° W | 24.295° | 2026-06-22 23:10:02.214Z | 203.318° 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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