COSMOS 1638, 15620
Orbit data source: Space-Track
COSMOS 1638, 15620 is a payload satellite owned by GUKOS (CIS) in LEO that was launched on Thu, 21 Mar 1985 UTC via a KOSMOS 11K65M 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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15620 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
CISRelated business
Manufacturer
NPO PM
Mission
Spacecraft
Bus & Motor
STRELA-1 11F625, Unknown motor
Mass
60 kg wet, 60 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 16 hours ago
TLE from 16 hours ago
0 COSMOS 1638
1 15620U 85023D 25348.93950302 -.00000018 00000-0 -18959-4 0 9992
2 15620 74.0562 280.5373 0014731 79.9444 345.5968 12.49211209857721Epoch: 2025-12-14T22:32Z
TLE epoch observation values (Epoch: 2025-12-14T22:32:53.060Z)
Latitude
61.13435°
Longitude
-110.48443°
Altitude
1,466.669 km
Speed
7.14 km/s
True Right ascension
20h 46m 19s
True Declination
61° 00' 07"
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
13:24:50
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,477.185 km
Perigee altitude
1,454.075 km
Semi-major axis
7,843.767 km
Eccentricity
0.00147
Inclination
74.0562°
RAAN
280.5373°
Arg. of periapsis
79.9444°
True anomaly
345.55474°
Mean anomaly
345.5968°
Eccentric anomaly
345.57578°
Mean motion
3.12432 °/min
Orbital period
115.22 mins
BSTAR
-0.000018959
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Other satellites on launch #23 in the year 1985 (1985-03-21 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 1638 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. |
|---|---|---|---|---|---|---|---|
| 13 mins | 2025-12-15 19:26:15.488Z | 148.542° SSE | 2025-12-15 19:33:15.488Z | 89.199° E | 26.538° | 2025-12-15 19:39:15.488Z | 41.307° NE |
| 15 mins | 2025-12-15 21:23:15.488Z | 219.543° SW | 2025-12-15 21:30:15.488Z | 304.774° NW | 40.258° | 2025-12-15 21:38:15.488Z | 12.327° NNE |
| 6 mins | 2025-12-15 23:27:15.488Z | 300.376° NW | 2025-12-15 23:29:15.488Z | 314.773° NW | 12.76° | 2025-12-15 23:33:15.488Z | 343.134° N |
| 13 mins | 2025-12-16 05:33:15.488Z | 4.454° NNE | 2025-12-16 05:39:15.488Z | 61.842° ENE | 28.902° | 2025-12-16 05:46:15.488Z | 118.942° SE |
| 15 mins | 2025-12-16 07:30:15.488Z | 329.635° NNW | 2025-12-16 07:37:15.488Z | 251.001° W | 39.672° | 2025-12-16 07:45:15.488Z | 183.567° SSW |
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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