CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1964-0004
THOR AGENA D
THOR AGENA D (NORAD 681) came down while still attached to its host on 21 January 1964, after 2 months in orbit.
Official date
NORAD number
681
International designator
1963-042A
Object type
Spacecraft
Country
United States
Launched
29 Oct 1963Vandenberg
Re-entered (UTC)
21 Jan 1964UTC calendar day
Time in orbit
2 months84 days
How it ended
Came down attached to its host
Latitude range
89.9°N to 89.9°SFinal inclination 89.9°
Mass
480 kg
Operator
NRO / USA ACE
Built by
LMSC
Bus
CORONA ARGON
Programme
CORONA ARGON
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 89.9°, allowed a re-entry anywhere between 89.9°N and 89.9°S.
Life in orbit
2 monthsTHOR AGENA D’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1963-042
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1964-0004
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1964-0004
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.