ORBCOMM FM 31, 25981
Orbit data source: Space-Track
ORBCOMM FM 31, 25981 is a payload satellite owned by Orbcomm (US) in LEO that was launched on Sat, 04 Dec 1999 UTC via a PEGASUS XL/HAPS launch vehicle from the Air Force Eastern Test Range (AFETR). 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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25981 intel report (Beta)
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Identifier
Orbit
Country
US / ORBRelated business
Manufacturer
OSC-Germantown
Mission
Non-operational Commercial Communications
Bus & Motor
MICROSTAR, Unknown motor
Mass
44 kg wet, 44 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl + 2 Pan, 4.2 m
Radar Cross Section
1.484 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 ORBCOMM FM 31
1 25981U 99065B 26171.26966596 .00000441 00000-0 19079-3 0 9998
2 25981 45.0208 139.6256 0002674 44.4352 315.6711 14.38066839386974Epoch: 2026-06-20T06:28Z
TLE epoch observation values (Epoch: 2026-06-20T06:28:19.138Z)
Latitude
-0.00002°
Longitude
134.05913°
Altitude
763.528 km
Speed
7.475 km/s
True Right ascension
09h 18m 30s
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
23:09:10
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
768.346 km
Perigee altitude
764.525 km
Semi-major axis
7,144.572 km
Eccentricity
0.00027
Inclination
45.0208°
RAAN
139.6256°
Arg. of periapsis
44.4352°
True anomaly
315.64968°
Mean anomaly
315.6711°
Eccentric anomaly
315.66039°
Mean motion
3.59401 °/min
Orbital period
100.17 mins
BSTAR
0.00019079
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Other satellites on launch #65 in the year 1999 (1999-12-04 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.ORBCOMM FM 31 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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2026-06-22 23:39:52.924Z | 202.655° SW | 2026-06-22 23:43:52.924Z | 143.685° SSE | 29.744° | 2026-06-22 23:47:52.924Z | 82.92° E |
| 9 mins | 2026-06-23 01:24:52.924Z | 254.977° W | 2026-06-23 01:28:52.924Z | 336.149° NNW | 44.141° | 2026-06-23 01:33:52.924Z | 65.441° ENE |
| 8 mins | 2026-06-23 03:10:52.924Z | 290.425° WNW | 2026-06-23 03:14:52.924Z | 10.968° NNE | 36.669° | 2026-06-23 03:18:52.924Z | 70.968° E |
| 8 mins | 2026-06-23 04:56:52.924Z | 298.409° NW | 2026-06-23 04:59:52.924Z | 347.209° N | 42.814° | 2026-06-23 05:04:52.924Z | 102.218° ESE |
| 8 mins | 2026-06-23 06:41:52.924Z | 275.575° WNW | 2026-06-23 06:44:52.924Z | 228.125° WSW | 32.019° | 2026-06-23 06:49:52.924Z | 150.029° SSE |
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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