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SJ-23, 55131

Orbit data source: Space-Track

SJ-23, 55131 is a payload satellite owned by PLA SSF (CN) in GEO that was launched on Sun, 08 Jan 2023 UTC via a CHANG ZHENG 7A launch vehicle from the Wenchang Satellite Launch Center (WSC). 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.

Not visible in the next 10 days

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Iframe URL

https://www.satcat.com/sats-embedded/55131?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

55131, 2023-002A

Orbit

GEO

Country

CN / PRC

Related business

Strategic Support Troops (CN)

Manufacturer

CAST?

Mission

Operational Civil Communications

Bus & Motor

DFH-4E?, DFH-4 LAE

Mass

~5,000 kg wet, ~2,500 kg dry

Launch date (UTC)

2023-01-08 (3 years ago)

Launch vehicle

CHANG ZHENG 7A

Launch site

Wenchang Satellite Launch Center (WSC)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 15.0 m

Radar Cross Section

34.063 m², Large (>1 m²)

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

TLE from 15 hours ago

0 SJ-23
1 55131U 23002A   25301.73183440  .00000165  00000-0  00000+0 0  9994
2 55131   3.1187  81.2543 0000450 293.7081 312.2897  1.00457577 10187

Epoch: 2025-10-28T17:33Z

TLE epoch observation values (Epoch: 2025-10-28T17:33:50.492Z)

Latitude

-2.83454°

Longitude

26.4075°

Altitude

35,733.23 km

Speed

3.077 km/s

True Right ascension

21h 48m 43s

True Declination

-2° 49' 54"

Sunlit

Object was in daylight 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

03:52:25

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,737.553 km

Perigee altitude

35,733.763 km

Semi-major axis

42,113.795 km

Eccentricity

0.00005

Inclination

3.1187°

RAAN

81.2543°

Arg. of periapsis

293.7081°

True anomaly

312.28589°

Mean anomaly

312.2897°

Eccentric anomaly

312.28779°

Mean motion

0.25113 °/min

Orbital period

1,433.49 mins

BSTAR

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Other satellites on launch #2 in the year 2023 (2023-01-08 UTC)

SJ-23 AKM, 55180

CZ-7A R/B, 55132

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SJ-23 Visibility

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SJ-23 is likely not visible in the next few days.

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55131 neighbors

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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 SJ-23, 55131 on other resources

View SJ-23, 55131 on NASA - NSSDCA Website

View SJ-23, 55131 on Heavens-Above

View SJ-23, 55131 on Keep Track

View SJ-23, 55131 on Celestrak

View SJ-23, 55131 on Gunter's Space Page

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

SJ-23, 55131

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: 2025-10-28T17:33:50.492Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #2 in the year 2023 (2023-01-08 UTC)

SJ-23 Visibility

55131 neighbors

Co-orbital & Co-planar RSOs

Check out SJ-23, 55131 on other resources

Documentation

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