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, Unknown HBR
Radar Cross Section
2.313 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 13 hours ago
TLE from 13 hours ago
0 SJ-5
1 25731U 99025B 26044.68324839 .00000056 00000-0 53482-4 0 9999
2 25731 98.7445 90.1037 0016548 350.4079 9.6775 14.12909285377887Epoch: 2026-02-13T16:23Z
TLE epoch observation values (Epoch: 2026-02-13T16:23:52.660Z)
Latitude
-0.00006°
Longitude
60.41716°
Altitude
840.545 km
Speed
7.439 km/s
True Right ascension
06h 00m 24s
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
07:40:36
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
858.558 km
Perigee altitude
834.647 km
Semi-major axis
7,224.74 km
Eccentricity
0.00165
Inclination
98.7445°
RAAN
90.1037°
Arg. of periapsis
350.4079°
True anomaly
9.70944°
Mean anomaly
9.6775°
Eccentric anomaly
9.69346°
Mean motion
3.53435 °/min
Orbital period
101.86 mins
BSTAR
0.000053482
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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 | 2026-02-14 15:05:08.172Z | 35.403° NE | 2026-02-14 15:09:08.172Z | 89.018° E | 29.759° | 2026-02-14 15:14:08.172Z | 160.669° S |
| 7 mins | 2026-02-14 16:47:08.172Z | 339.239° N | 2026-02-14 16:50:08.172Z | 291.169° WNW | 26.99° | 2026-02-14 16:54:08.172Z | 237.574° WSW |
| 9 mins | 2026-02-15 02:31:08.172Z | 146.155° SSE | 2026-02-15 02:35:08.172Z | 69.596° E | 40.487° | 2026-02-15 02:40:08.172Z | 355.086° N |
| 5 mins | 2026-02-15 04:14:08.172Z | 242.603° WSW | 2026-02-15 04:16:08.172Z | 268.309° W | 16.561° | 2026-02-15 04:19:08.172Z | 304.254° NW |
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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