YAOGAN 21, 40143
Orbit data source: Space-Track
YAOGAN 21, 40143 is a payload satellite owned by PLA GAD (CN) in SSO that was launched on Mon, 08 Sep 2014 UTC via a CHANG ZHENG 4B launch vehicle from the Taiyaun Space Center, China (TSC). 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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40143 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
CN / PRCRelated business
Manufacturer
CAST
Mission
Operational Defense Imaging
Bus & Motor
JB-10, Unknown motor
Mass
~3,000 kg wet, ~3,000 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 4.0 m
Radar Cross Section
9.231 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 8 hours ago
TLE from 8 hours ago
0 YAOGAN 21
1 40143U 14053A 25361.26097604 .00007029 00000-0 29421-3 0 9995
2 40143 97.1739 43.9419 0008284 353.0294 7.0827 15.23824559628754Epoch: 2025-12-27T06:15Z
TLE epoch observation values (Epoch: 2025-12-27T06:15:48.329Z)
Latitude
-0.00007°
Longitude
-145.99931°
Altitude
491.769 km
Speed
7.622 km/s
True Right ascension
02h 55m 46s
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
13:58:51
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
496.959 km
Perigee altitude
485.578 km
Semi-major axis
6,869.405 km
Eccentricity
0.00083
Inclination
97.1739°
RAAN
43.9419°
Arg. of periapsis
353.0294°
True anomaly
7.09442°
Mean anomaly
7.0827°
Eccentric anomaly
7.08856°
Mean motion
3.8121 °/min
Orbital period
94.44 mins
BSTAR
0.00029421
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Other satellites on launch #53 in the year 2014 (2014-09-08 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 21 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 | 2025-12-27 16:18:00.608Z | 339.13° N | 2025-12-27 16:20:00.608Z | 263.17° W | 32.749° | 2025-12-27 16:22:00.608Z | 220.662° SW |
| 5 mins | 2025-12-28 02:54:00.608Z | 146.636° SSE | 2025-12-28 02:56:00.608Z | 53.137° ENE | 40.331° | 2025-12-28 02:59:00.608Z | 356.759° N |
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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