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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Edit Public Description
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: 14 hours ago
TLE from 14 hours ago
0 SJ-5
1 25731U 99025B 25362.87403834 .00000059 00000-0 54828-4 0 9993
2 25731 98.7517 44.3696 0017839 118.7050 241.5918 14.12898010371273Epoch: 2025-12-28T20:58Z
TLE epoch observation values (Epoch: 2025-12-28T20:58:36.912Z)
Latitude
-0.00002°
Longitude
-7.86396°
Altitude
858.528 km
Speed
7.42 km/s
True Right ascension
02h 57m 28s
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
10:29:20
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
859.53 km
Perigee altitude
833.754 km
Semi-major axis
7,224.779 km
Eccentricity
0.00178
Inclination
98.7517°
RAAN
44.3696°
Arg. of periapsis
118.705°
True anomaly
241.41219°
Mean anomaly
241.5918°
Eccentric anomaly
241.50197°
Mean motion
3.53432 °/min
Orbital period
101.86 mins
BSTAR
0.000054828
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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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2025-12-29 14:35:11.673Z | 53.815° ENE | 2025-12-29 14:38:11.673Z | 89.261° E | 16.744° | 2025-12-29 14:41:11.673Z | 126.5° SE |
| 9 mins | 2025-12-29 16:15:11.673Z | 2.278° NNE | 2025-12-29 16:19:11.673Z | 298.95° NW | 39.95° | 2025-12-29 16:24:11.673Z | 211.925° SW |
| 8 mins | 2025-12-30 02:01:11.673Z | 117.76° SE | 2025-12-30 02:04:11.673Z | 74.544° E | 26.938° | 2025-12-30 02:09:11.673Z | 7.435° NNE |
| 7 mins | 2025-12-30 03:42:11.673Z | 212.71° SW | 2025-12-30 03:45:11.673Z | 264.459° W | 29.223° | 2025-12-30 03:49:11.673Z | 322.476° NNW |
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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