CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0306
OPS 1166
OPS 1166 (NORAD 12315) came down while still attached to its host on 20 June 1981, after 3 months in orbit.
Official date
NORAD number
12315
International designator
1981-019A
Object type
Spacecraft
Country
United States
Launched
28 Feb 1981Vandenberg
Re-entered (UTC)
20 Jun 1981UTC calendar day
Time in orbit
3 months112 days
How it ended
Came down attached to its host
Latitude range
83.7°N to 83.7°SFinal inclination 96.3°
Mass
2,400 kg
Operator
NRO / SAFSP
Built by
LMSC
Bus
KH-8
Programme
KH8E
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
3 monthsOPS 1166’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 20 Jun 1981
4 entries
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0306
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0306
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.