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: 3 hours ago
TLE from 3 hours ago
0 YAOGAN 21
1 40143U 14053A 25300.51100049 .00009093 00000-0 37228-3 0 9991
2 40143 97.1824 345.8203 0011887 224.6288 135.3994 15.24457922619503Epoch: 2025-10-27T12:15Z
TLE epoch observation values (Epoch: 2025-10-27T12:15:50.442Z)
Latitude
-0.00003°
Longitude
125.74833°
Altitude
501.338 km
Speed
7.61 km/s
True Right ascension
23h 03m 16s
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
11:03:35
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
497.528 km
Perigee altitude
481.201 km
Semi-major axis
6,867.501 km
Eccentricity
0.00119
Inclination
97.1824°
RAAN
345.8203°
Arg. of periapsis
224.6288°
True anomaly
135.49494°
Mean anomaly
135.3994°
Eccentric anomaly
135.44718°
Mean motion
3.81369 °/min
Orbital period
94.4 mins
BSTAR
0.00037228
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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. |
|---|---|---|---|---|---|---|---|
| 7 mins | 2025-10-27 15:58:03.302Z | 12.711° NNE | 2025-10-27 16:02:03.302Z | 180.539° SSW | 42.592° | 2025-10-27 16:05:03.302Z | 190.936° SSW |
| 4 mins | 2025-10-28 02:36:03.302Z | 111.814° ESE | 2025-10-28 02:38:03.302Z | 57.533° ENE | 24.586° | 2025-10-28 02:40:03.302Z | 18.351° NNE |
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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