COSMOS 1261, 12376
Orbit data source: Space-Track
COSMOS 1261, 12376 is a payload satellite owned by PVO (CIS) in HEO that was launched on Tue, 31 Mar 1981 UTC via an MOLNIYA 8K78M 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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12376 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
CISRelated business
Manufacturer
NPOL/KOMET
Mission
Defense Early Warn
Bus & Motor
OKO, Unknown motor
Mass
~1,250 kg wet, ~1,150 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Irr + 6 Pan, 2.1 m
Radar Cross Section
15.540 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 22 hours ago
TLE from 22 hours ago
0 COSMOS 1261
1 12376U 81031A 25258.18722632 .00000585 00000-0 00000-0 0 9993
2 12376 68.5944 105.8018 6007516 357.7421 0.5867 2.00884885221952Epoch: 2025-09-15T04:29Z
TLE epoch observation values (Epoch: 2025-09-15T04:29:36.354Z)
Latitude
-0.00012°
Longitude
44.0073°
Altitude
4,230.859 km
Speed
7.754 km/s
True Right ascension
07h 03m 13s
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
19:08:48
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
36,091.503 km
Perigee altitude
4,214.347 km
Semi-major axis
26,531.062 km
Eccentricity
0.60075
Inclination
68.5944°
RAAN
105.8018°
Arg. of periapsis
357.7421°
True anomaly
2.94151°
Mean anomaly
0.5867°
Eccentric anomaly
1.46927°
Mean motion
0.50224 °/min
Orbital period
716.79 mins
BSTAR
0
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Other satellites on launch #31 in the year 1981 (1981-03-31 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 1261 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. |
|---|---|---|---|---|---|---|---|
| 110 mins | 2025-09-16 05:29:05.751Z | 333.838° NNW | 2025-09-16 06:11:05.751Z | 311.731° NW | 17.801° | 2025-09-16 07:19:05.751Z | 295.324° NW |
| 132 mins | 2025-09-16 16:24:05.751Z | 226.025° WSW | 2025-09-16 16:43:05.751Z | 312.72° NW | 42.984° | 2025-09-16 18:36:05.751Z | 53.031° ENE |
| 270 mins | 2025-09-16 20:28:05.751Z | 81.311° E | 2025-09-16 23:13:05.751Z | 123.853° SE | 16.574° | 2025-09-17 00:58:05.751Z | 150.741° 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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