COSMOS 2508, 40921
Orbit data source: Space-Track
COSMOS 2508, 40921 is a payload satellite owned by VVKO VKS (CIS) in LEO that was launched on Wed, 23 Sep 2015 UTC via an ROKOT launch vehicle from the Plesetsk Missile And Space Complex (PKMTR). 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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40921 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
CISRelated business
Manufacturer
Resehetnev ISS
Mission
Operational Defense Communications
Bus & Motor
STRELA-3M, Unknown motor
Mass
280 kg wet, 280 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl + 1 Ant, 3.5 m
Radar Cross Section
1.583 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 11 hours ago
TLE from 11 hours ago
0 COSMOS 2508
1 40921U 15050B 26023.61735118 -.00000034 00000-0 -31741-3 0 9990
2 40921 82.4894 168.2249 0013428 341.0824 18.9755 12.42908179468887Epoch: 2026-01-23T14:48Z
TLE epoch observation values (Epoch: 2026-01-23T14:48:59.141Z)
Latitude
-0.00006°
Longitude
-176.97512°
Altitude
1,487.002 km
Speed
7.125 km/s
True Right ascension
11h 12m 53s
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
03:10:00
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,502.218 km
Perigee altitude
1,481.083 km
Semi-major axis
7,869.788 km
Eccentricity
0.00134
Inclination
82.4894°
RAAN
168.2249°
Arg. of periapsis
341.0824°
True anomaly
19.02561°
Mean anomaly
18.9755°
Eccentric anomaly
19.00055°
Mean motion
3.10884 °/min
Orbital period
115.8 mins
BSTAR
-0.00031741
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Other satellites on launch #50 in the year 2015 (2015-09-23 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.COSMOS 2508 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 | 2026-01-24 08:20:50.632Z | 111.242° ESE | 2026-01-24 08:25:50.632Z | 74.734° E | 16.103° | 2026-01-24 08:29:50.632Z | 45.544° ENE |
| 15 mins | 2026-01-24 10:13:50.632Z | 184.954° SSW | 2026-01-24 10:20:50.632Z | 176.561° S | 44.952° | 2026-01-24 10:28:50.632Z | 7.891° NNE |
| 9 mins | 2026-01-24 12:14:50.632Z | 264.151° W | 2026-01-24 12:18:50.632Z | 294.977° NW | 17.654° | 2026-01-24 12:23:50.632Z | 333.179° NNW |
| 15 mins | 2026-01-24 20:24:50.632Z | 7.643° NNE | 2026-01-24 20:31:50.632Z | 72.394° E | 34.668° | 2026-01-24 20:39:50.632Z | 143.312° SSE |
| 14 mins | 2026-01-24 22:21:50.632Z | 334.658° NNW | 2026-01-24 22:28:50.632Z | 270.305° WNW | 32.808° | 2026-01-24 22:35:50.632Z | 210.618° SW |
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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