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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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<iframe src="https://www.satcat.com/sats-embedded/40143?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/40143?theme=dark&initialShowStats=false

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Identifier

40143, 2014-053A

Orbit

SSO

Country

CN / PRC

Related business

Equipment Development Department of the Central Military Commission (PLA) (CN)

Manufacturer

CAST

Mission

Operational Defense Imaging

Bus & Motor

JB-10, Unknown motor

Mass

~3,000 kg wet, ~3,000 kg dry

Launch date (UTC)

2014-09-08 (11 years ago)

Launch vehicle

CHANG ZHENG 4B

Launch site

Taiyaun Space Center, China (TSC)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 4.0 m

Radar Cross Section

9.231 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 15 hours ago

TLE from 15 hours ago

0 YAOGAN 21
1 40143U 14053A   25338.73545641  .00014375  00000-0  60321-3 0  9996
2 40143  97.1769  22.3970 0010195  66.1435 294.0870 15.23526770625323

Epoch: 2025-12-04T17:39Z

TLE epoch observation values (Epoch: 2025-12-04T17:39:03.433Z)

Latitude

-0.00005°

Longitude

43.84507°

Altitude

495.46 km

Speed

7.619 km/s

True Right ascension

01h 29m 35s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

06:53:40

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

499.169 km

Perigee altitude

485.16 km

Semi-major axis

6,870.301 km

Eccentricity

0.00102

Inclination

97.1769°

RAAN

22.397°

Arg. of periapsis

66.1435°

True anomaly

293.98029°

Mean anomaly

294.087°

Eccentric anomaly

294.03365°

Mean motion

3.81136 °/min

Orbital period

94.45 mins

BSTAR

0.00060321

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Other satellites on launch #53 in the year 2014 (2014-09-08 UTC)

CZ-4B R/B, 40145 (Decayed)

TIANTUO 2, 40144 (Decayed)

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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.

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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.
6 mins	2025-12-05 16:16:28.619Z	356.855° N	2025-12-05 16:19:28.619Z	287.281° WNW	35.655°	2025-12-05 16:22:28.619Z	214.405° SW
5 mins	2025-12-06 02:53:28.619Z	148.593° SSE	2025-12-06 02:55:28.619Z	105.054° ESE	37.984°	2025-12-06 02:58:28.619Z	1.303° NNE

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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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Check out YAOGAN 21, 40143 on other resources

View YAOGAN 21, 40143 on NASA - NSSDCA Website

View YAOGAN 21, 40143 on Heavens-Above

View YAOGAN 21, 40143 on Keep Track

View YAOGAN 21, 40143 on Celestrak

View YAOGAN 21, 40143 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

YAOGAN 21, 40143

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2025-12-04T17:39:03.433Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #53 in the year 2014 (2014-09-08 UTC)

YAOGAN 21 Visibility forecast

Co-orbital & Co-planar RSOs

Check out YAOGAN 21, 40143 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago