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: 11 hours ago
TLE from 11 hours ago
0 COSMOS 1900
1 18665U 87101A 26261.09100487 .00000009 00000-0 25695-4 0 9999
2 18665 66.0829 126.8685 0030180 25.0337 335.2225 14.55686830 62003Epoch: 2026-09-18T02:11Z
TLE epoch observation values (Epoch: 2026-09-18T02:11:02.820Z)
Latitude
0.00002°
Longitude
97.08788°
Altitude
689.812 km
Speed
7.522 km/s
True Right ascension
08h 27m 28s
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
05:39:22
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
726.943 km
Perigee altitude
684.186 km
Semi-major axis
7,083.701 km
Eccentricity
0.00302
Inclination
66.0829°
RAAN
126.8685°
Arg. of periapsis
25.0337°
True anomaly
335.07706°
Mean anomaly
335.2225°
Eccentric anomaly
335.14983°
Mean motion
3.64043 °/min
Orbital period
98.89 mins
BSTAR
0.000025695
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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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-09-18 15:31:01.419Z | 130.908° SE | 2026-09-18 15:33:01.419Z | 104.572° ESE | 14.218° | 2026-09-18 15:35:01.419Z | 78.785° E |
| 7 mins | 2026-09-18 17:11:01.419Z | 225.771° WSW | 2026-09-18 17:14:01.419Z | 301.913° NW | 63.76° | 2026-09-18 17:18:01.419Z | 22.067° NNE |
| 8 mins | 2026-09-19 01:50:01.419Z | 333.901° NNW | 2026-09-19 01:53:01.419Z | 47.75° ENE | 81.457° | 2026-09-19 01:58:01.419Z | 147.982° 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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