YAOGAN-39 01C, 57731
Orbit data source: Space-Track
YAOGAN-39 01C, 57731 is a payload satellite owned by PLA GAD (CN) in LEO that was launched on Thu, 31 Aug 2023 UTC via a CHANG ZHENG 2D launch vehicle from the Xichang Space Center, China (XSC). 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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57731 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
CN / PRCRelated business
Manufacturer
DFH
Mission
Operational Defense Sigint
Bus & Motor
Unknown
Mass
~300 kg wet, ~300 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 2.5 m
Radar Cross Section
11.063 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 17 hours ago
TLE from 17 hours ago
0 YAOGAN-39 01C
1 57731U 23130E 25259.85753687 .00005894 00000-0 28712-3 0 9993
2 57731 34.9942 56.0742 0001723 65.7172 294.3721 15.17704625113923Epoch: 2025-09-16T20:34Z
TLE epoch observation values (Epoch: 2025-09-16T20:34:51.185Z)
Latitude
-0.00001°
Longitude
111.3191°
Altitude
511.199 km
Speed
7.611 km/s
True Right ascension
03h 44m 17s
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
05:58:23
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
517.211 km
Perigee altitude
514.835 km
Semi-major axis
6,894.16 km
Eccentricity
0.00017
Inclination
34.9942°
RAAN
56.0742°
Arg. of periapsis
65.7172°
True anomaly
294.35411°
Mean anomaly
294.3721°
Eccentric anomaly
294.36311°
Mean motion
3.79159 °/min
Orbital period
94.95 mins
BSTAR
0.00028712
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Other satellites on launch #130 in the year 2023 (2023-08-31 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.YAOGAN-39 01C 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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2025-09-17 14:10:57.994Z | 198.877° SSW | 2025-09-17 14:12:57.994Z | 164.901° S | 17.959° | 2025-09-17 14:15:57.994Z | 113.795° SE |
| 5 mins | 2025-09-17 15:50:57.994Z | 226.783° WSW | 2025-09-17 15:52:57.994Z | 173.316° S | 30.954° | 2025-09-17 15:55:57.994Z | 109.617° ESE |
| 5 mins | 2025-09-17 17:30:57.994Z | 238.344° WSW | 2025-09-17 17:32:57.994Z | 183.12° SSW | 29.795° | 2025-09-17 17:35:57.994Z | 125.152° SE |
| 4 mins | 2025-09-17 19:10:57.994Z | 230.092° WSW | 2025-09-17 19:12:57.994Z | 193.756° SSW | 15.836° | 2025-09-17 19:14:57.994Z | 163.042° S |
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 ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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