CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1971-0112
OFO 1
OFO 1 (NORAD 4690) re-entered Earth’s atmosphere on 9 May 1971, after 6 months in orbit.
Official date
NORAD number
4690
International designator
1970-094A
Object type
Spacecraft
Country
United States
Launched
9 Nov 1970Wallops
Re-entered (UTC)
9 May 1971UTC calendar day
Time in orbit
6 months181 days
How it ended
Re-entered (natural decay)
Latitude range
37.4°N to 37.4°SFinal inclination 37.4°
Mass
133 kg
Operator
ARC / NASA WS
Built by
Space General
Bus
OV3
Programme
NASA Small
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 37.4°, allowed a re-entry anywhere between 37.4°N and 37.4°S.
Life in orbit
6 monthsOFO 1’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1970-094
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1971-0112
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1971-0112
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.