Key statistics
Satellite SL-8 R/B at a glance.
Uptime
20408
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: 98.221 minutes
Inclination: 74.0301 deg
SMA: 7051.727 km
Apoapsis: 677.077 km
Periapsis: 670.108 km
RAAN: 104.8958 deg
Eccentricy: 0.00049418
Argument of periapsis: 164.7484 deg
Mean anomaly: 195.3834 deg
Mean motion: 14.6608614 rev/day
Mean motion (dot): 0.00000993 rev/day2
B* drag term: 0.00018646805 1/REarth
Two-line elements (TLE)
Creation date: Sept. 4, 2025, 10:13 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 4, 2025, 12:49 a.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 04139U 69091B 25247.03462431 .00000993 00000-0 18647-3 0 9995
TLE line 2: 2 04139 74.0301 104.8958 0004942 164.7484 195.3834 14.66086140967777
Live tracking on map
Real-time ground track for satellite SL-8 R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object 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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