Key statistics
Satellite SL-3 R/B at a glance.
Uptime
16147
Days in orbit
Revolutions
≈ 14.2
Per day
Orbit
LEO
Low Earth Orbit
Inclination
81.2
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-3 R/B.
Object identification
Identified? True
Debris? False
Object name: SL-3 R/B
International designator: 1981-075B
Object number (NORAD): 12646
Object ID (CCSDS): 12646
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 101.668 minutes
Inclination: 81.2251 deg
SMA: 7215.79 km
Apoapsis: 885.32 km
Periapsis: 789.991 km
RAAN: 148.9019 deg
Eccentricy: 0.0066056
Argument of periapsis: 282.4632 deg
Mean anomaly: 148.8927 deg
Mean motion: 14.1637066 rev/day
Mean motion (dot): 0.00000116 rev/day2
B* drag term: 0.00005153 1/REarth
Two-line elements (TLE)
Creation date: Oct. 21, 2025, 11:56 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 21, 2025, 6 p.m. UTC
TLE line 0: 0 SL-3 R/B
TLE line 1: 1 12646U 81075B 25294.75025786 .00000116 00000-0 51530-4 0 9998
TLE line 2: 2 12646 81.2251 148.9019 0066056 282.4632 148.8927 14.16370660282951
Live tracking on map
Real-time ground track for satellite SL-3 R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object SL-3 R/B.
Associated space launch
Interkosmos satellite research satellite carrying scientific experiments designed and built in Bulgaria
SL-3 R/B was lifted into orbit during the mission ‘Vostok 8A92M | Bulgaria 1300’, on board a Vostok 8A92M space rocket.
The launch took place on Aug. 7, 1981, 1:35 p.m. from 43/3 (43L).
For more information about the launch, click the button.
Vostok 8A92M | Bulgaria 1300
Agency: N/A
Status: Launch Successful
Launch date: Aug. 7, 1981, 1:35 p.m. UTC
Rocket: Vostok 8A92M
Launch pad: 43/3 (43L)
Location: Plesetsk Cosmodrome, Russian Federation
...
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