CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1968-0254
EXPLORER 24 (ADI-2)
EXPLORER 24 (ADI-2) (NORAD 931) re-entered Earth’s atmosphere on 18 October 1968, after 3 years, 10 months in orbit.
Official date
NORAD number
931
International designator
1964-076A
Object type
Spacecraft
Country
United States
Launched
21 Nov 1964Vandenberg
Re-entered (UTC)
18 Oct 1968UTC calendar day
Time in orbit
3 years, 10 months1,427 days
How it ended
Re-entered (natural decay)
Latitude range
81.3°N to 81.3°SFinal inclination 81.3°
Mass
8 kg
Operator
NASA LaRC
Built by
Schjeldahl
Bus
12' Sphere
Programme
Explorer AD
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 81.3°, allowed a re-entry anywhere between 81.3°N and 81.3°S.
Life in orbit
3 years, 10 monthsEXPLORER 24 (ADI-2)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 18 Oct 1968
2 entriesFrom the same launch
1964-076
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1968-0254
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1968-0254
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.