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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
25731 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Create New Watchlist
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: 6 hours ago
TLE from 6 hours ago
0 SJ-5
1 25731U 99025B 26123.14650137 .00000041 00000-0 45215-4 0 9990
2 25731 98.7294 166.6827 0017968 121.9068 238.3855 14.12924135388963Epoch: 2026-05-03T03:30Z
TLE epoch observation values (Epoch: 2026-05-03T03:30:57.718Z)
Latitude
-0.00004°
Longitude
-107.11202°
Altitude
859.113 km
Speed
7.419 km/s
True Right ascension
11h 06m 43s
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
17:26:14
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
859.533 km
Perigee altitude
833.57 km
Semi-major axis
7,224.689 km
Eccentricity
0.0018
Inclination
98.7294°
RAAN
166.6827°
Arg. of periapsis
121.9068°
True anomaly
238.21036°
Mean anomaly
238.3855°
Eccentric anomaly
238.29791°
Mean motion
3.53439 °/min
Orbital period
101.86 mins
BSTAR
0.000045215
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #25 in the year 1999 (1999-05-10 UTC)
Did you know?
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
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-05-03 14:20:28.987Z | 63.374° ENE | 2026-05-03 14:22:28.987Z | 85.873° E | 13.274° | 2026-05-03 14:24:28.987Z | 109.588° ESE |
| 8 mins | 2026-05-03 16:00:28.987Z | 6.089° NNE | 2026-05-03 16:04:28.987Z | 249.414° W | 42.744° | 2026-05-03 16:08:28.987Z | 204.451° SW |
| 7 mins | 2026-05-04 01:46:28.987Z | 105.072° ESE | 2026-05-04 01:49:28.987Z | 60.587° ENE | 22.958° | 2026-05-04 01:53:28.987Z | 12.45° NNE |
| 9 mins | 2026-05-04 03:25:28.987Z | 195.032° SSW | 2026-05-04 03:29:28.987Z | 256.757° W | 34.087° | 2026-05-04 03:34:28.987Z | 331.046° 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 |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|