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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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ISO8601 Format

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: 13 hours ago

TLE from 13 hours ago

0 YAOGAN 21
1 40143U 14053A   25241.93758166  .00010709  00000-0  44518-3 0  9996
2 40143  97.1927 289.6784 0012732  88.6713 271.5984 15.23889413610581

Epoch: 2025-08-29T22:30Z

TLE epoch observation values (Epoch: 2025-08-29T22:30:07.055Z)

Latitude

0.00005°

Longitude

-26.23006°

Altitude

496.991 km

Speed

7.616 km/s

True Right ascension

19h 18m 42s

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

03:08:55

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

499.82 km

Perigee altitude

482.328 km

Semi-major axis

6,869.211 km

Eccentricity

0.00127

Inclination

97.1927°

RAAN

289.6784°

Arg. of periapsis

88.6713°

True anomaly

271.45255°

Mean anomaly

271.5984°

Eccentric anomaly

271.52548°

Mean motion

3.81226 °/min

Orbital period

94.43 mins

BSTAR

0.00044518

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

TIANTUO 2, 40144 (Decayed)

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

YAOGAN 21 Visibility forecast

Observer location: undefined°, undefined°
Set Observer location

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	2025-08-30 16:23:43.779Z	358.7° N	2025-08-30 16:26:43.779Z	277.409° WNW	37.968°	2025-08-30 16:29:43.779Z	209.988° SW
5 mins	2025-08-31 03:00:43.779Z	141.797° SSE	2025-08-31 03:02:43.779Z	83.696° E	36.786°	2025-08-31 03:05:43.779Z	2.646° NNE