CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1974-0187
OSO 7
OSO 7 (NORAD 5491) re-entered Earth’s atmosphere on 9 July 1974, after 2 years, 9 months in orbit.
Official date
NORAD number
5491
International designator
1971-083A
Object type
Spacecraft
Country
United States
Launched
29 Sep 1971Cape Canaveral
Re-entered (UTC)
9 Jul 1974UTC calendar day
Time in orbit
2 years, 9 months1,014 days
How it ended
Re-entered (natural decay)
Latitude range
33.1°N to 33.1°SFinal inclination 33.1°
Mass
642 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 33.1°, allowed a re-entry anywhere between 33.1°N and 33.1°S.
Life in orbit
2 years, 9 monthsOSO 7’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 9 Jul 1974
2 entriesFrom the same launch
1971-083
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1974-0187
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1974-0187
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.