Showing default

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

Iframe embed code

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

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

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: 1 week ago

TLE from 1 week ago

0 SJ-23
1 55131U 23002A   25254.73801546  .00000147  00000-0  00000+0 0  9995
2 55131   2.9964  81.8770 0002239 133.2312  83.5112  1.00072467  9713

Epoch: 2025-09-11T17:42Z

TLE epoch observation values (Epoch: 2025-09-11T17:42:44.535Z)

Latitude

-1.77617°

Longitude

41.91134°

Altitude

35,841.281 km

Speed

3.073 km/s

True Right ascension

19h 54m 22s

True Declination

-1° 46' 28"

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

00:23:50

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,853.082 km

Perigee altitude

35,834.175 km

Semi-major axis

42,221.766 km

Eccentricity

0.00022

Inclination

2.9964°

RAAN

81.877°

Arg. of periapsis

133.2312°

True anomaly

83.53669°

Mean anomaly

83.5112°

Eccentric anomaly

83.52395°

Mean motion

0.25017 °/min

Orbital period

1,439.01 mins

BSTAR

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

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

CZ-7A R/B, 55132

SJ-23 AKM, 55180

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

Click here to try in Sandbox

SJ-23 Visibility

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

Loading historical data...

55131 neighbors

Authenticating...

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Please sign-in to view Co-orbital & Co-planar RSOs.

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in ascending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in ascending order

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: 1 week ago

TLE from 1 week ago

TLE epoch observation values (Epoch: 2025-09-11T17:42:44.535Z)

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: 1 week ago