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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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: 20 hours ago
TLE from 20 hours ago
0 SJ-21
1 49330U 21094A 26305.89472063 -.00000352 00000-0 00000-0 0 9991
2 49330 5.4366 60.2508 0053640 174.3871 256.3964 1.00279743 6740Epoch: 2026-11-01T21:28Z
TLE epoch observation values (Epoch: 2026-11-01T21:28:23.862Z)
Latitude
5.10729°
Longitude
127.05385°
Altitude
35,837.547 km
Speed
3.071 km/s
True Right ascension
08h 41m 19s
True Declination
5° 06' 08"
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
13:13:23
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
36,011.586 km
Perigee altitude
35,559.255 km
Semi-major axis
42,163.558 km
Eccentricity
0.00536
Inclination
5.4366°
RAAN
60.2508°
Arg. of periapsis
174.3871°
True anomaly
255.79993°
Mean anomaly
256.3964°
Eccentric anomaly
256.09807°
Mean motion
0.25069 °/min
Orbital period
1,436.04 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. |
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| 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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