SJ-5, 25731
Orbit data source: Space-Track
SJ-5, 25731 is a payload satellite owned by CASC (CN) in SSO that was launched on Mon, 10 May 1999 UTC via a CHANG ZHENG 4B launch vehicle from the Taiyaun Space Center, China (TSC). 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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25731 intel report (Beta)
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Identifier
Orbit
Country
CN / PRCRelated business
Manufacturer
DFH
Mission
Civil Science
Bus & Motor
CAST-968, Unknown motor
Mass
258 kg wet, 258 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box + 1 Pan, 2.0 m
Radar Cross Section
2.313 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 15 hours ago
TLE from 15 hours ago
0 SJ-5
1 25731U 99025B 26255.07363381 .00000005 00000-0 25590-4 0 9994
2 25731 98.7191 295.2701 0018021 107.3203 252.9942 14.12942098407597Epoch: 2026-09-12T01:46Z
TLE epoch observation values (Epoch: 2026-09-12T01:46:01.961Z)
Latitude
-0.00007°
Longitude
-82.32593°
Altitude
856.057 km
Speed
7.423 km/s
True Right ascension
19h 41m 04s
True Declination
0° 00' 00"
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
08:48:55
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
859.509 km
Perigee altitude
833.47 km
Semi-major axis
7,224.627 km
Eccentricity
0.0018
Inclination
98.7191°
RAAN
295.2701°
Arg. of periapsis
107.3203°
True anomaly
252.79685°
Mean anomaly
252.9942°
Eccentric anomaly
252.89551°
Mean motion
3.53444 °/min
Orbital period
101.86 mins
BSTAR
0.00002559
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Other satellites on launch #25 in the year 1999 (1999-05-10 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-5 Visibility forecast
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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. |
|---|---|---|---|---|---|---|---|
| 7 mins | 2026-09-13 01:42:39.060Z | 113.702° SE | 2026-09-13 01:46:39.060Z | 56.622° ENE | 26.079° | 2026-09-13 01:49:39.060Z | 17.454° NNE |
| 9 mins | 2026-09-13 03:22:39.060Z | 198.236° SSW | 2026-09-13 03:26:39.060Z | 263.05° W | 40.39° | 2026-09-13 03:31:39.060Z | 330.964° NNW |
| 9 mins | 2026-09-13 15:44:39.060Z | 12.362° NNE | 2026-09-13 15:48:39.060Z | 336.265° NNW | 83.933° | 2026-09-13 15:53:39.060Z | 196.864° SSW |
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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