Key statistics
Satellite SL-4 R/B at a glance.
Uptime
24
Days in orbit
Revolutions
≈ 15.6
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
98.0
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: 2025-310B
Object number (NORAD): 67235
Object ID (CCSDS): 67235
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
Orbital parameters
Period: 92.255 minutes
Inclination: 97.9616 deg
SMA: 6763.234 km
Apoapsis: 560.911 km
Periapsis: 209.287 km
RAAN: 29.7443 deg
Eccentricy: 0.02599524
Argument of periapsis: 353.0296 deg
Mean anomaly: 6.7368 deg
Mean motion: 15.60885906 rev/day
Mean motion (dot): 0.00298558 rev/day2
B* drag term: 0.00058848405 1/REarth
Two-line elements (TLE)
Creation date: Jan. 17, 2026, 5:49 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Jan. 17, 2026, 3:13 p.m. UTC
TLE line 0: 0 SL-4 R/B
TLE line 1: 1 67235U 25310B 26017.63468168 .00298558 24573-5 58848-3 0 9991
TLE line 2: 2 67235 97.9616 29.7443 0259952 353.0296 6.7368 15.60885906 3586
Live tracking on map
Real-time ground track for satellite SL-4 R/B.
In-orbit conjunctions
There are no conjunctions computed for SL-4 R/B, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
Note: Assignment of payloads to this launch is uncertain. The Russian Obzor-R satellite is a planned X-band radar earth observation satellite designed by TsSKB-Progress. In 2012, the development of the Arkon-2M radar satellite was stopped and instead the development of the Obzor-R was initiated. The satellite features the BRLK X-band Synthetic Aperture Radar as the imaging instrument with a ground resolution of 500 m.
SL-4 R/B was lifted into orbit during the mission ‘Soyuz 2.1a | Obzor-R No.1’, on board a Soyuz 2.1a space rocket.
The launch took place on Dec. 25, 2025, 2:11 p.m. from 43/4 (43R).
For more information about the launch, click the button.
Soyuz 2.1a | Obzor-R No.1
Agency: N/A
Status: Launch Successful
Launch date: Dec. 25, 2025, 2:11 p.m. UTC
Rocket: Soyuz 2.1a
Launch pad: 43/4 (43R)
Location: Plesetsk Cosmodrome, Russian Federation
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Latest news about this satellite
Launch Roundup: International launches fill manifest during last full week of 2025
The last full week of 2025 will be a busy one, with nine launches scheduled… The post Launch Roundup: International launches fill manifest during last full week of 2025 appeared first on NASASpaceFlight.com.
Launch Roundup: China, Russia, Rocket Lab, ULA join SpaceX in flying this week
The upcoming launch week, starting on Monday, Dec. 8, is a very busy one as… The post Launch Roundup: China, Russia, Rocket Lab, ULA join SpaceX in flying this week appeared first on NASASpaceFlight.com.
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