COSMOS 1877, 18336
Orbit data source: Space-Track
COSMOS 1877, 18336 is a payload satellite owned by UNKS (CIS) in LEO that was launched on Mon, 07 Sep 1987 UTC via a TSIKLON-3 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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18336 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
NPO PM
Mission
Defense Communications
Bus & Motor
STRELA-3, Unknown motor
Mass
225 kg wet, 225 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl, 0.8 m
Radar Cross Section
1.257 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 8 hours ago
TLE from 8 hours ago
0 COSMOS 1877
1 18336U 87074C 26061.81166148 .00000014 00000-0 19076-4 0 9999
2 18336 82.5686 5.8664 0000536 291.0597 129.5938 12.63661898774807Epoch: 2026-03-02T19:28Z
TLE epoch observation values (Epoch: 2026-03-02T19:28:47.551Z)
Latitude
59.90146°
Longitude
-73.99243°
Altitude
1,418.271 km
Speed
7.157 km/s
True Right ascension
01h 15m 13s
True Declination
59° 45' 53"
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
07:10:42
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,405.603 km
Perigee altitude
1,404.768 km
Semi-major axis
7,783.322 km
Eccentricity
0.00005
Inclination
82.5686°
RAAN
5.8664°
Arg. of periapsis
291.0597°
True anomaly
129.59853°
Mean anomaly
129.5938°
Eccentric anomaly
129.59617°
Mean motion
3.16079 °/min
Orbital period
113.9 mins
BSTAR
0.000019076
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Other satellites on launch #74 in the year 1987 (1987-09-07 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 1877 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. |
|---|---|---|---|---|---|---|---|
| 15 mins | 2026-03-03 07:09:28.666Z | 5.038° NNE | 2026-03-03 07:17:28.666Z | 78.56° E | 33.865° | 2026-03-03 07:24:28.666Z | 141.883° SSE |
| 13 mins | 2026-03-03 09:06:28.666Z | 330.319° NNW | 2026-03-03 09:12:28.666Z | 265.58° W | 32.264° | 2026-03-03 09:19:28.666Z | 208.427° SW |
| 13 mins | 2026-03-03 19:58:28.666Z | 147.947° SSE | 2026-03-03 20:04:28.666Z | 85.94° E | 33.615° | 2026-03-03 20:11:28.666Z | 22.7° NE |
| 13 mins | 2026-03-03 21:53:28.666Z | 226.249° WSW | 2026-03-03 21:59:28.666Z | 290.289° WNW | 32.722° | 2026-03-03 22:06:28.666Z | 352.583° N |
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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