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: 1 day ago
TLE from 1 day ago
0 SJ-5
1 25731U 99025B 26206.35348338 .00000031 00000-0 39541-4 0 9996
2 25731 98.7241 247.8010 0015891 244.7789 115.1737 14.12936432400710Epoch: 2026-07-25T08:29Z
TLE epoch observation values (Epoch: 2026-07-25T08:29:00.964Z)
Latitude
0.00006°
Longitude
177.47999°
Altitude
857.146 km
Speed
7.421 km/s
True Right ascension
16h 31m 12s
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
23:22:44
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
857.99 km
Perigee altitude
835.029 km
Semi-major axis
7,224.646 km
Eccentricity
0.00159
Inclination
98.7241°
RAAN
247.801°
Arg. of periapsis
244.7789°
True anomaly
115.33836°
Mean anomaly
115.1737°
Eccentric anomaly
115.25605°
Mean motion
3.53442 °/min
Orbital period
101.86 mins
BSTAR
0.000039541
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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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2026-07-26 15:38:43.736Z | 15.18° NNE | 2026-07-26 15:43:43.736Z | 42.783° NE | 44.026° | 2026-07-26 15:48:43.736Z | 191.357° SSW |
| 6 mins | 2026-07-27 01:26:43.736Z | 95.494° ESE | 2026-07-27 01:29:43.736Z | 57.468° ENE | 17.829° | 2026-07-27 01:32:43.736Z | 22.682° NE |
| 9 mins | 2026-07-27 03:05:43.736Z | 183.143° SSW | 2026-07-27 03:09:43.736Z | 268.386° W | 41.062° | 2026-07-27 03:14:43.736Z | 338.544° N |
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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