COSMOS 1900, 18665
Orbit data source: Space-Track
COSMOS 1900, 18665 is a payload satellite owned by VMF (CIS) in LEO that was launched on Sat, 12 Dec 1987 UTC via a TSIKLON-2 launch vehicle from the Tyuratam Missile And Space Complex (TTMTR). 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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18665 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
KOMET/ARSL
Mission
Defense Sigint
Bus & Motor
US-A REACTOR, Unknown motor
Mass
4,300 kg wet, 1,154 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cone + Cyl, 2.9 m
Radar Cross Section
6.586 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 16 hours ago
TLE from 16 hours ago
0 COSMOS 1900
1 18665U 87101A 26080.87677754 .00000095 00000-0 45213-4 0 9993
2 18665 66.0824 270.4484 0031941 166.4706 193.7264 14.55629933 35772Epoch: 2026-03-21T21:02Z
TLE epoch observation values (Epoch: 2026-03-21T21:02:33.579Z)
Latitude
-0.00001°
Longitude
135.41729°
Altitude
731.395 km
Speed
7.478 km/s
True Right ascension
18h 01m 47s
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
18:02:20
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
728.376 km
Perigee altitude
683.122 km
Semi-major axis
7,083.886 km
Eccentricity
0.00319
Inclination
66.0824°
RAAN
270.4484°
Arg. of periapsis
166.4706°
True anomaly
193.63989°
Mean anomaly
193.7264°
Eccentric anomaly
193.68311°
Mean motion
3.64029 °/min
Orbital period
98.89 mins
BSTAR
0.000045213
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Other satellites on launch #101 in the year 1987 (1987-12-12 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 1900 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 | 2026-03-22 13:39:37.230Z | 177.378° S | 2026-03-22 13:43:37.230Z | 104.202° ESE | 32.937° | 2026-03-22 13:47:37.230Z | 46.042° ENE |
| 6 mins | 2026-03-22 15:22:37.230Z | 268.245° W | 2026-03-22 15:25:37.230Z | 320.455° NNW | 23.743° | 2026-03-22 15:28:37.230Z | 2.759° NNE |
| 6 mins | 2026-03-22 22:19:37.230Z | 6.278° NNE | 2026-03-22 22:21:37.230Z | 40.495° NE | 24.853° | 2026-03-22 22:25:37.230Z | 105.367° ESE |
| 7 mins | 2026-03-23 00:00:37.230Z | 304.723° NW | 2026-03-23 00:03:37.230Z | 251.675° W | 29.963° | 2026-03-23 00:07:37.230Z | 185.299° SSW |
| 5 mins | 2026-03-23 12:45:37.230Z | 135.763° SSE | 2026-03-23 12:47:37.230Z | 108.387° ESE | 16.594° | 2026-03-23 12:50:37.230Z | 69.565° E |
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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