CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0234
EXPLORER 19 (ADI-1)
EXPLORER 19 (ADI-1) (NORAD 714) re-entered Earth’s atmosphere on 10 May 1981, after 17 years, 4 months in orbit.
Official date
NORAD number
714
International designator
1963-053A
Object type
Spacecraft
Country
United States
Launched
19 Dec 1963Vandenberg
Re-entered (UTC)
10 May 1981UTC calendar day
Time in orbit
17 years, 4 months6,352 days
How it ended
Re-entered (natural decay)
Latitude range
78.7°N to 78.7°SFinal inclination 78.7°
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 78.7°, allowed a re-entry anywhere between 78.7°N and 78.7°S.
Life in orbit
17 years, 4 monthsEXPLORER 19 (ADI-1)’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/1981-0234
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0234
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.