Key statistics
Satellite SL-4 R/B at a glance.
Uptime
2
Days in orbit
Revolutions
≈ 16.4
Per day
Orbit
LEO
Low Earth Orbit
Inclination
51.7
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-4 R/B.
Object identification
Identified? True
Debris? False
Object name: SL-4 R/B
International designator: 2025-275B
Object number (NORAD): 66665
Object ID (CCSDS): 66665
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
Orbital parameters
Decay date: Nov. 29, 2025
Period: 87.639 minutes
Inclination: 51.6501 deg
SMA: 6535.72 km
Apoapsis: 160.579 km
Periapsis: 154.591 km
RAAN: 207.6669 deg
Eccentricy: 0.0004581
Argument of periapsis: 68.9636 deg
Mean anomaly: 291.1882 deg
Mean motion: 16.43094745 rev/day
Mean motion (dot): 0.08397088 rev/day2
B* drag term: 0.00039285 1/REarth
Two-line elements (TLE)
Creation date: Nov. 29, 2025, 12:26 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Nov. 29, 2025, 8:19 a.m. UTC
TLE line 0: 0 SL-4 R/B
TLE line 1: 1 66665U 25275B 25333.34681791 .08397088 12512-4 39285-3 0 9993
TLE line 2: 2 66665 51.6501 207.6669 0004581 68.9636 291.1882 16.43094745 331
Live tracking on map
Satellite SL-4 R/B has decayed and is no longer in orbit. No tracking available.
In-orbit conjunctions
Satellite SL-4 R/B has decayed and is no longer in orbit. No conjunctions available.
Associated space launch
Soyuz MS-28 will carry three cosmonauts and one astronaut to the International Space Station aboard the Soyuz spacecraft from the Baikonur Cosmodrome in Kazakhstan. The crew consists of Roscosmos cosmonauts Sergei Kud-Sverchkov, Sergei Mikayev and Oleg Platonov.
SL-4 R/B was lifted into orbit during the mission ‘Soyuz 2.1a | Soyuz MS-28’, on board a Soyuz 2.1a space rocket.
The launch took place on Nov. 27, 2025, 9:27 a.m. from 31/6.
For more information about the launch, click the button.
Soyuz 2.1a | Soyuz MS-28
Agency: Russian Federal Space Agency (ROSCOSMOS)
Status: Launch Successful
Launch date: Nov. 27, 2025, 9:27 a.m. UTC
Rocket: Soyuz 2.1a
Launch pad: 31/6
Location: Baikonur Cosmodrome, Republic of Kazakhstan
...
Latest news about this satellite
All eight ISS docking ports occupied for the first time, Expedition 74 begins
After the arrival of the MS-28 spacecraft on Nov. 27, all eight docking ports on… The post All eight ISS docking ports occupied for the first time, Expedition 74 begins appeared first on NASASpaceFlight.com.
After key Russian launch site is damaged, NASA accelerates Dragon supply missions
It is by no means certain that Russia will be able to fix Site 31 soon.
Baikonur pad damaged in Soyuz launch to ISS
The Baiknour pad used for the launch of the latest crew to the ISS has sustained damage, raising questions about its ability to support upcoming missions to the station. The post Baikonur pad damaged in Soyuz launch to ISS appeared first on SpaceNews.
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