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: 17 hours ago
TLE from 17 hours ago
0 SJ-5
1 25731U 99025B 26300.04035714 .00000027 00000-0 37562-4 0 9994
2 25731 98.7113 339.0433 0016478 343.5265 16.5370 14.12947343413949Epoch: 2026-10-27T00:58Z
TLE epoch observation values (Epoch: 2026-10-27T00:58:06.856Z)
Latitude
-0.00006°
Longitude
-70.89446°
Altitude
840.791 km
Speed
7.438 km/s
True Right ascension
22h 36m 10s
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
13:19:47
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
858.376 km
Perigee altitude
834.567 km
Semi-major axis
7,224.609 km
Eccentricity
0.00165
Inclination
98.7113°
RAAN
339.0433°
Arg. of periapsis
343.5265°
True anomaly
16.59085°
Mean anomaly
16.537°
Eccentric anomaly
16.56392°
Mean motion
3.53445 °/min
Orbital period
101.85 mins
BSTAR
0.000037562
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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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2026-10-28 02:34:50.433Z | 159.561° S | 2026-10-28 02:38:50.433Z | 117.441° SE | 76.034° | 2026-10-28 02:43:50.433Z | 349.474° N |
| 8 mins | 2026-10-28 14:57:50.433Z | 39.086° NE | 2026-10-28 15:01:50.433Z | 107.437° ESE | 37.238° | 2026-10-28 15:05:50.433Z | 161.365° S |
| 7 mins | 2026-10-28 16:38:50.433Z | 340.13° N | 2026-10-28 16:41:50.433Z | 295.81° NW | 28.986° | 2026-10-28 16:45:50.433Z | 241.001° WSW |
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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