Key statistics
Satellite SL-12 R/B(2) at a glance.
Uptime
13903
Days in orbit
Revolutions
≈ 1.0
Per day
Orbit
OTHER
Other
Inclination
11.3
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-12 R/B(2).
Object identification
Identified? True
Debris? False
Object name: SL-12 R/B(2)
International designator: 1987-084D
Object number (NORAD): 18387
Object ID (CCSDS): 18387
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 1439.32 minutes
Inclination: 11.283 deg
SMA: 42227.793 km
Apoapsis: 35980.866 km
Periapsis: 35718.449 km
RAAN: 328.189 deg
Eccentricy: 0.00310715
Argument of periapsis: 244.6413 deg
Mean anomaly: 115.1677 deg
Mean motion: 1.00047259 rev/day
Mean motion (dot): -0.00000298 rev/day2
B* drag term: 0.0 1/REarth
Two-line elements (TLE)
Creation date: Oct. 23, 2025, 6:40 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 22, 2025, 11:13 p.m. UTC
TLE line 0: 0 SL-12 R/B(2)
TLE line 1: 1 18387U 87084D 25295.96753543 -.00000298 00000-0 00000-0 0 9999
TLE line 2: 2 18387 11.2830 328.1890 0031072 244.6413 115.1677 1.00047259146391
Live tracking on map
Real-time ground track for satellite SL-12 R/B(2).
Associated space launch
Geostationary military relay satellite
SL-12 R/B(2) was lifted into orbit during the mission ‘Proton | Potok 4’, on board a Proton space rocket.
The launch took place on Oct. 1, 1987, 5:09 p.m. from 200/39 (200L).
For more information about the launch, click the button.
Proton | Potok 4
Agency: N/A
Status: Launch Successful
Launch date: Oct. 1, 1987, 5:09 p.m. UTC
Rocket: Proton
Launch pad: 200/39 (200L)
Location: Baikonur Cosmodrome, Republic of Kazakhstan
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