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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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: 21 hours ago
TLE from 21 hours ago
0 YAOGAN 21
1 40143U 14053A 26172.55485899 .00009004 00000-0 34775-3 0 9998
2 40143 97.1472 212.6033 0009920 81.2546 278.9817 15.26432475655622Epoch: 2026-06-21T13:18Z
TLE epoch observation values (Epoch: 2026-06-21T13:18:59.816Z)
Latitude
0.00001°
Longitude
103.10061°
Altitude
488.537 km
Speed
7.621 km/s
True Right ascension
14h 10m 24s
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
21:40:52
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
490.24 km
Perigee altitude
476.627 km
Semi-major axis
6,861.571 km
Eccentricity
0.00099
Inclination
97.1472°
RAAN
212.6033°
Arg. of periapsis
81.2546°
True anomaly
278.8694°
Mean anomaly
278.9817°
Eccentric anomaly
278.92555°
Mean motion
3.81863 °/min
Orbital period
94.27 mins
BSTAR
0.00034775
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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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2026-06-22 15:03:50.177Z | 39.098° NE | 2026-06-22 15:05:50.177Z | 84.783° E | 28.595° | 2026-06-22 15:08:50.177Z | 159.351° S |
| 5 mins | 2026-06-23 03:12:50.177Z | 205.728° SW | 2026-06-23 03:14:50.177Z | 262.582° W | 30.612° | 2026-06-23 03:17:50.177Z | 328.866° NNW |
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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