ORBCOMM FM 21, 25475
Orbit data source: Space-Track
ORBCOMM FM 21, 25475 is a payload satellite owned by Orbcomm (US) in LEO that was launched on Wed, 23 Sep 1998 UTC via a PEGASUS XL/HAPS launch vehicle from the Pegasus Launch, Eastern Range Air Space (ERAS). 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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25475 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
US / ORBRelated business
Manufacturer
OSC-Germantown
Mission
Non-operational Commercial Communications
Bus & Motor
MICROSTAR, Unknown motor
Mass
42 kg wet, 42 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: 18 hours ago
TLE from 18 hours ago
0 ORBCOMM FM 21
1 25475U 98053A 25348.84867886 .00001033 00000-0 38651-3 0 9998
2 25475 45.0069 133.6800 0001259 101.7725 258.3264 14.37798137423245Epoch: 2025-12-14T20:22Z
TLE epoch observation values (Epoch: 2025-12-14T20:22:05.853Z)
Latitude
-0.00005°
Longitude
104.39986°
Altitude
765.964 km
Speed
7.473 km/s
True Right ascension
08h 54m 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
13:22:47
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
768.227 km
Perigee altitude
766.428 km
Semi-major axis
7,145.464 km
Eccentricity
0.00013
Inclination
45.0069°
RAAN
133.68°
Arg. of periapsis
101.7725°
True anomaly
258.31227°
Mean anomaly
258.3264°
Eccentric anomaly
258.31934°
Mean motion
3.59333 °/min
Orbital period
100.19 mins
BSTAR
0.00038651
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Other satellites on launch #53 in the year 1998 (1998-09-23 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 21 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 | 2025-12-15 15:00:13.143Z | 273.655° WNW | 2025-12-15 15:04:13.143Z | 330.958° NNW | 38.844° | 2025-12-15 15:09:13.143Z | 65.557° ENE |
| 9 mins | 2025-12-15 16:46:13.143Z | 295.333° NW | 2025-12-15 16:50:13.143Z | 0.455° NNE | 38.647° | 2025-12-15 16:55:13.143Z | 85.429° E |
| 8 mins | 2025-12-15 18:32:13.143Z | 289.101° WNW | 2025-12-15 18:36:13.143Z | 175.134° S | 43.214° | 2025-12-15 18:40:13.143Z | 125.634° SE |
| 5 mins | 2025-12-15 20:18:13.143Z | 254.449° W | 2025-12-15 20:20:13.143Z | 227.964° WSW | 18.066° | 2025-12-15 20:23:13.143Z | 188.463° SSW |
| 9 mins | 2025-12-16 12:35:13.143Z | 220.511° SW | 2025-12-16 12:39:13.143Z | 146.696° SSE | 39.269° | 2025-12-16 12:44:13.143Z | 72.002° E |
| 9 mins | 2025-12-16 14:20:13.143Z | 268.448° W | 2025-12-16 14:24:13.143Z | 332.206° NNW | 40.684° | 2025-12-16 14:29:13.143Z | 65.072° ENE |
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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