YAOGAN-39 01B, 57728
Orbit data source: Space-Track
YAOGAN-39 01B, 57728 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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57728 intel report (Beta)
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Identifier
Orbit
Country
CN / PRCRelated business
Manufacturer
SAST
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: 14 hours ago
TLE from 14 hours ago
0 YAOGAN-39 01B
1 57728U 23130B 26079.94029157 .00006346 00000-0 31080-3 0 9993
2 57728 34.9953 342.0830 0002662 284.0281 76.0136 15.17503236142075Epoch: 2026-03-20T22:34Z
TLE epoch observation values (Epoch: 2026-03-20T22:34:01.191Z)
Latitude
-0.00001°
Longitude
-174.89013°
Altitude
511.856 km
Speed
7.61 km/s
True Right ascension
22h 48m 19s
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
17:21:04
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
518.468 km
Perigee altitude
514.797 km
Semi-major axis
6,894.769 km
Eccentricity
0.00027
Inclination
34.9953°
RAAN
342.083°
Arg. of periapsis
284.0281°
True anomaly
76.0432°
Mean anomaly
76.0136°
Eccentric anomaly
76.0284°
Mean motion
3.79109 °/min
Orbital period
94.96 mins
BSTAR
0.0003108
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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 01B 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 | 2026-03-21 20:54:24.173Z | 195.01° SSW | 2026-03-21 20:56:24.173Z | 160.575° S | 17.356° | 2026-03-21 20:58:24.173Z | 124.396° SE |
| 5 mins | 2026-03-21 22:34:24.173Z | 222.941° SW | 2026-03-21 22:36:24.173Z | 166.256° S | 30.542° | 2026-03-21 22:39:24.173Z | 108.122° ESE |
| 5 mins | 2026-03-22 00:14:24.173Z | 235.879° WSW | 2026-03-22 00:16:24.173Z | 176.795° S | 30.116° | 2026-03-22 00:19:24.173Z | 122.807° SE |
| 4 mins | 2026-03-22 01:54:24.173Z | 228.383° WSW | 2026-03-22 01:55:24.173Z | 210.289° SW | 16.836° | 2026-03-22 01:58:24.173Z | 160.096° 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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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