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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

Country

CN / PRC

Related business

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

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
Last TLE update: 4 hours ago

TLE from 4 hours ago

0 SJ-21
1 49330U 21094A   25286.66968155 -.00000357  00000-0  00000-0 0  9990
2 49330   4.5580  62.6456 0056000 167.5760 161.4100  1.00281794  2776

Epoch: 2025-10-13T16:04Z

TLE epoch observation values (Epoch: 2025-10-13T16:04:20.485Z)

Latitude

-2.33207°

Longitude

128.33915°

Altitude

36,008.193 km

Speed

3.058 km/s

True Right ascension

02h 07m 34s

True Declination

-2° 19' 47"

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

14:29:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

36,020.963 km

Perigee altitude

35,548.737 km

Semi-major axis

42,162.987 km

Eccentricity

0.0056

Inclination

4.558°

RAAN

62.6456°

Arg. of periapsis

167.576°

True anomaly

161.61322°

Mean anomaly

161.41°

Eccentric anomaly

161.51175°

Mean motion

0.2507 °/min

Orbital period

1,436.01 mins

BSTAR

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

SJ-21 AKM, 49382

CZ-3B R/B, 49331

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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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SJ-21 Visibility

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

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49330 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-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 & historyLast TLE update: 4 hours ago

TLE from 4 hours ago

TLE epoch observation values (Epoch: 2025-10-13T16:04:20.485Z)

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

Expand to show TLE details & history
Last TLE update: 4 hours ago