Key statistics
Satellite COSMOS 1638 at a glance.
Uptime
14877
Days in orbit
Revolutions
≈ 12.5
Per day
Orbit
LEO
Low Earth Orbit
Inclination
74.1
Latest
Satellite identification and parameters
Extended collection of information and parameters for COSMOS 1638.
Object identification
Identified? True
Debris? False
Object name: COSMOS 1638
International designator: 1985-023D
Object number (NORAD): 15620
Object ID (CCSDS): 15620
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 115.273 minutes
Inclination: 74.0562 deg
SMA: 7845.933 km
Apoapsis: 1479.335 km
Periapsis: 1456.261 km
RAAN: 284.0237 deg
Eccentricy: 0.00147045
Argument of periapsis: 84.1074 deg
Mean anomaly: 30.5315 deg
Mean motion: 12.49211182 rev/day
Mean motion (dot): 0.00000005 rev/day2
B* drag term: 0.00013871353 1/REarth
Two-line elements (TLE)
Creation date: Dec. 12, 2025, 10:14 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 12, 2025, 7:23 a.m. UTC
TLE line 0: 0 COSMOS 1638
TLE line 1: 1 15620U 85023D 25346.30787367 .00000005 00000-0 13871-3 0 9991
TLE line 2: 2 15620 74.0562 284.0237 0014705 84.1074 30.5315 12.49211182857397
Live tracking on map
Real-time ground track for satellite COSMOS 1638.
Associated space launch
Military communications satellites
COSMOS 1638 was lifted into orbit during the mission ‘Kosmos-3M | Strela-1M 289-296’, on board a Kosmos-3M space rocket.
The launch took place on March 21, 1985, 12:08 a.m. from 132/2.
For more information about the launch, click the button.
Kosmos-3M | Strela-1M 289-296
Agency: N/A
Status: Launch Successful
Launch date: March 21, 1985, 12:08 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 132/2
Location: Plesetsk Cosmodrome, Russian Federation
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