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SJ-21, 49330

Orbit data source: Space-Track

SJ-21, 49330 is a payload satellite owned by SAST (CN) in GEO that was launched on Sun, 24 Oct 2021 UTC via a CHANG ZHENG 3B launch vehicle from the Xichang Space Center, China (XSC). 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/49330?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/49330?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

49330, 2021-094A

Orbit

GEO

Last TLE update

12 hours ago

Origin

China Aerospace Science and Technology Corporation (CASC) (CN / PRC)

Manufacturer

SAST?

Mission

Operational Defense Technology

Bus & Motor

SJ21, Unknown motor

Mass

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

Launch date (UTC)

2021-10-24 (4 years ago)

Launch vehicle

CHANG ZHENG 3B

Launch site

Xichang Space Center, China (XSC)

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

TLE from 12 hours ago

0 SJ-21
1 49330U 21094A   25235.30576679 -.00000365  00000-0  00000-0 0  9990
2 49330   4.4344  62.8830 0055597 163.9582 342.1575  1.00281188  2358

Epoch: 2025-08-23T07:20Z

TLE epoch observation values (Epoch: 2025-08-23T07:20:18.25Z)

Latitude

2.50927°

Longitude

126.97752°

Altitude

35,561.075 km

Speed

3.091 km/s

True Right ascension

13h 55m 35s

True Declination

2° 30' 24"

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

10:19:30

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

36,019.435 km

Perigee altitude

35,550.606 km

Semi-major axis

42,163.157 km

Eccentricity

0.00556

Inclination

4.4344°

RAAN

62.883°

Arg. of periapsis

163.9582°

True anomaly

341.96099°

Mean anomaly

342.1575°

Eccentric anomaly

342.05938°

Mean motion

0.25069 °/min

Orbital period

1,436.02 mins

BSTAR

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Other satellites on launch #94 in the year 2021 (2021-10-24 UTC)

CZ-3B R/B, 49331

SJ-21 AKM, 49382

SJ-21 Visibility

Observer location: undefined°, undefined°
Set Observer location

SJ-21 is likely not visible in the next few days

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49330 neighbors

Authenticating...

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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Authenticating...

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Check out SJ-21, 49330 on other resources

View SJ-21, 49330 on NASA - NSSDCA Website

View SJ-21, 49330 on Heavens-Above

View SJ-21, 49330 on Keep Track

View SJ-21, 49330 on Celestrak

View SJ-21, 49330 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-21, 49330

Orbit data source: Space-Track

Expand to show TLE details & history

TLE from 12 hours ago

TLE epoch observation values (Epoch: 2025-08-23T07:20:18.25Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #94 in the year 2021 (2021-10-24 UTC)

SJ-21 Visibility

49330 neighbors

Co-orbital & Co-planar RSOs

Check out SJ-21, 49330 on other resources

Documentation