Key statistics
Satellite SL-8 R/B at a glance.
Uptime
20348
Days in orbit
Revolutions
≈ 14.7
Per day
Orbit
LEO
Low Earth Orbit
Inclination
74.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-8 R/B.
Object identification
Identified? True
Debris? False
Object name: SL-8 R/B
International designator: 1969-091B
Object number (NORAD): 4139
Object ID (CCSDS): 4139
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 98.226 minutes
Inclination: 74.0297 deg
SMA: 7051.988 km
Apoapsis: 678.522 km
Periapsis: 669.183 km
RAAN: 219.5643 deg
Eccentricy: 0.0006622
Argument of periapsis: 280.8026 deg
Mean anomaly: 79.2397 deg
Mean motion: 14.66005004 rev/day
Mean motion (dot): 0.00000431 rev/day2
B* drag term: 0.000084405 1/REarth
Two-line elements (TLE)
Creation date: July 6, 2025, 6:05 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 6, 2025, 12:43 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 04139U 69091B 25187.53018752 .00000431 00000-0 84405-4 0 9999
TLE line 2: 2 04139 74.0297 219.5643 0006622 280.8026 79.2397 14.66005004959051
Live tracking on map
Real-time ground track for satellite SL-8 R/B.
Associated space launch
The first soviet navigation system called Tsiklon consisted of Zaliv satellites in low earth orbit.
SL-8 R/B was lifted into orbit during the mission ‘Kosmos-3M | Zaliv 4’, on board a Kosmos-3M space rocket.
The launch took place on Oct. 21, 1969, 12:49 p.m. from 132/1 (132L).
For more information about the launch, click the button.
Kosmos-3M | Zaliv 4
Agency: N/A
Status: Launch Successful
Launch date: Oct. 21, 1969, 12:49 p.m. UTC
Rocket: Kosmos-3M
Launch pad: 132/1 (132L)
Location: Plesetsk Cosmodrome, Russian Federation
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