CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0191
M-4S R/B
M-4S R/B (NORAD 6332) re-entered Earth’s atmosphere on 28 April 1981, after 8 years, 8 months in orbit.
Official date
NORAD number
6332
International designator
1972-064B
Object type
Rocket body
Country
Japan
Launched
19 Aug 1972Uchinoura
Re-entered (UTC)
28 Apr 1981UTC calendar day
Time in orbit
8 years, 8 months3,174 days
How it ended
Re-entered (natural decay)
Latitude range
30.9°N to 30.9°SFinal inclination 30.9°
Mass
310 kg
Where it came down
Latitude band its orbit allowedExact position not recorded
No position was recorded for this re-entry. Its final orbit, inclined at 30.9°, allowed a re-entry anywhere between 30.9°N and 30.9°S.
Life in orbit
8 years, 8 monthsM-4S R/B’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 28 Apr 1981
3 entriesFrom the same launch
1972-064
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0191
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0191
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.