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: 2025-072B
Object number (NORAD): 63521
Object ID (CCSDS): 63521
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Decay date: April 10, 2025
Period: 87.708 minutes
Inclination: 51.6521 deg
SMA: 6539.148 km
Apoapsis: 165.653 km
Periapsis: 156.374 km
RAAN: 283.9113 deg
Eccentricy: 0.0007095
Argument of periapsis: 81.8811 deg
Mean anomaly: 43.3667 deg
Mean motion: 16.41802781 rev/day
Mean motion (dot): 0.11558378 rev/day2
B* drag term: 0.0006607 1/REarth
Two-line elements (TLE)
Creation date: April 10, 2025, 3:46 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: April 9, 2025, 11:17 p.m. UTC
TLE line 0: 0 SL-4 R/B
TLE line 1: 1 63521U 25072B 25099.97072997 .11558378 12466-4 66070-3 0 9991
TLE line 2: 2 63521 51.6521 283.9113 0007095 81.8811 43.3667 16.41802781 281
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-27 will carry two 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 Sergey Ryzhikov, Alexey Zubritsky, and NASA astronaut Jonathan "Jonny" Kim.
SL-4 R/B was lifted into orbit during the mission ‘Soyuz 2.1a | Soyuz MS-27’, on board a Soyuz 2.1a space rocket.
The launch took place on April 8, 2025, 5:47 a.m. from 31/6.
For more information about the launch, click the button.
Soyuz 2.1a | Soyuz MS-27
Agency: National Aeronautics and Space Administration
Status: Launch Successful
Launch date: April 8, 2025, 5:47 a.m. UTC
Rocket: Soyuz 2.1a
Launch pad: 31/6
Location: Baikonur Cosmodrome, Republic of Kazakhstan
...
Latest news about this satellite
Expedition 73 Crew Launches to International Space Station
A Soyuz rocket launches to the International Space Station with Expedition 73 crew members including NASA astronaut Jonny Kim on Tuesday, April 8, 2025, at the Baikonur Cosmodrome in Kazakhstan. The crew arrived at the space station the same day, bringing...
New International Crew Arrives at ISS on Soyuz MS-27
The Soyuz MS-27 crew arrived at the International Space Station this morning to replace Soyuz MS-26, continuing the 24-year pattern of maintaining permanent human presence through regular crew rotations. Soyuz […]
NASA Astronaut, Crewmates Arrive Safely at Space Station
NASA astronaut Jonny Kim, accompanied by Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky, arrived at the International Space Station on Tuesday, bringing the number of residents to 10 for the next two weeks. The Soyuz MS-27 spacecraft carrying K...
Newsletter sign-up
Weekly statistics, charts and insights to help you stay on top of the space industry.
