CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1975-0428
OPS 6381
OPS 6381 (NORAD 7918) was deorbited in a controlled re-entry on 5 November 1975, after 4 months in orbit.
Controlled re-entryOfficial date
NORAD number
7918
International designator
1975-051A
Object type
Spacecraft
Country
United States
Launched
8 Jun 1975Vandenberg
Re-entered (UTC)
5 Nov 1975UTC calendar day
Time in orbit
4 months150 days
How it ended
Deorbited (controlled re-entry)
Latitude range
83.7°N to 83.7°SFinal inclination 96.3°
Mass
7,624 kg
Operator
NRO / SAFSP
Built by
LMSC
Bus
KH-9
Programme
Hex II
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 96.3°, allowed a re-entry anywhere between 83.7°N and 83.7°S.
Life in orbit
4 monthsOPS 6381’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1975-051
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1975-0428
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1975-0428
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.