Key statistics
Satellite M-4S R/B at a glance.
Uptime
20031
Days in orbit
Revolutions
≈ 13.8
Per day
Orbit
LEO
Low Earth Orbit
Inclination
29.7
Latest
Satellite identification and parameters
Extended collection of information and parameters for M-4S R/B.
Object identification
Identified? True
Debris? False
Object name: M-4S R/B
International designator: 1971-011B
Object number (NORAD): 5126
Object ID (CCSDS): 5126
Country: JAPAN (JPN)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 104.629 minutes
Inclination: 29.6832 deg
SMA: 7355.225 km
Apoapsis: 986.166 km
Periapsis: 968.015 km
RAAN: 39.591 deg
Eccentricy: 0.0012339
Argument of periapsis: 335.7276 deg
Mean anomaly: 24.2719 deg
Mean motion: 13.76286293 rev/day
Mean motion (dot): 0.00000108 rev/day2
B* drag term: 0.00003991669 1/REarth
Two-line elements (TLE)
Creation date: Dec. 18, 2025, 8:02 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 18, 2025, 12:24 p.m. UTC
TLE line 0: 0 M-4S R/B
TLE line 1: 1 05126U 71011B 25352.51681908 .00000108 00000-0 39917-4 0 9991
TLE line 2: 2 05126 29.6832 39.5910 0012339 335.7276 24.2719 13.76286293758815
Live tracking on map
Real-time ground track for satellite M-4S R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object M-4S R/B.
Associated space launch
Japanese technological test satellite designed by the Institute of Space and Aeronautical Science, University of Tokyo.
M-4S R/B was lifted into orbit during the mission ‘Mu-4S | Tansei-1’, on board a Mu-4S space rocket.
The launch took place on Feb. 16, 1971, 4 a.m. from Mu Center.
For more information about the launch, click the button.
Mu-4S | Tansei-1
Agency: N/A
Status: Launch Successful
Launch date: Feb. 16, 1971, 4 a.m. UTC
Rocket: Mu-4S
Launch pad: Mu Center
Location: Uchinoura Space Center, Japan
...
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