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.
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Edit Public Description
Identifier
Orbit
Country
CN / PRCRelated business
Manufacturer
SAST?
Mission
Operational Defense Technology
Bus & Motor
SJ21, Unknown motor
Mass
~5,000 kg wet, ~2,500 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 2 Pan, 15.0 m
Radar Cross Section
34.063 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 21 hours ago
TLE from 21 hours ago
0 SJ-21
1 49330U 21094A 25338.48201005 -.00000340 00000-0 00000-0 0 9994
2 49330 4.6817 62.4331 0057032 170.4883 141.2924 1.00241547 3408Epoch: 2025-12-04T11:34Z
TLE epoch observation values (Epoch: 2025-12-04T11:34:05.668Z)
Latitude
-3.45412°
Longitude
127.64265°
Altitude
35,983.623 km
Speed
3.061 km/s
True Right ascension
00h 58m 48s
True Declination
-3° 27' 02"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
06:56:49
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
36,036.662 km
Perigee altitude
35,555.605 km
Semi-major axis
42,174.271 km
Eccentricity
0.0057
Inclination
4.6817°
RAAN
62.4331°
Arg. of periapsis
170.4883°
True anomaly
141.69882°
Mean anomaly
141.2924°
Eccentric anomaly
141.49584°
Mean motion
0.25059 °/min
Orbital period
1,436.58 mins
BSTAR
0
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Other satellites on launch #94 in the year 2021 (2021-10-24 UTC)
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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.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
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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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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 descending order |
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