CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0090
OSO 6
OSO 6 (NORAD 4065) re-entered Earth’s atmosphere on 7 March 1981, after 11 years, 6 months in orbit.
Official date
NORAD number
4065
International designator
1969-068A
Object type
Spacecraft
Country
United States
Launched
9 Aug 1969Cape Canaveral
Re-entered (UTC)
7 Mar 1981UTC calendar day
Time in orbit
11 years, 6 months4,228 days
How it ended
Re-entered (natural decay)
Latitude range
32.9°N to 32.9°SFinal inclination 32.9°
Mass
290 kg
Operator
GSFC
Built by
Ball
Bus
OSO
Programme
OSO
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 32.9°, allowed a re-entry anywhere between 32.9°N and 32.9°S.
Life in orbit
11 years, 6 monthsOSO 6’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 7 Mar 1981
1 entryFrom the same launch
1969-068
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0090
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0090
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.