CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1971-0117
OPS 7899
OPS 7899 (NORAD 5171) came down while still attached to its host on 13 May 1971, after 21 days in orbit.
Official date
NORAD number
5171
International designator
1971-033A
Object type
Spacecraft
Country
United States
Launched
22 Apr 1971Vandenberg
Re-entered (UTC)
13 May 1971UTC calendar day
Time in orbit
21 days21 days
How it ended
Came down attached to its host
Latitude range
69.1°N to 69.1°SFinal inclination 110.9°
Mass
2,400 kg
Operator
NRO / SAFSP
Built by
LMSC
Bus
KH-8
Programme
KH8B
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 110.9°, allowed a re-entry anywhere between 69.1°N and 69.1°S.
Life in orbit
21 daysOPS 7899’s lowest and highest points above Earth, week by week, from its tracking history.
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1971-0117
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1971-0117
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.