CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1991-0372
DELTA 1 DEB
DELTA 1 DEB (NORAD 21539) re-entered Earth’s atmosphere on 31 August 1991.
Official dateFragment record
NORAD number
21539
International designator
1975-052GV
Object type
Fragment
Country
United States
Parent launched
12 Jun 1975Vandenberg
Re-entered (UTC)
31 Aug 1991UTC calendar day
Time since launch
16 years, 2 months5,924 days
How it ended
Re-entered (natural decay)
Latitude range
79.1°N to 79.1°SFinal inclination 100.9°
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 100.9°, allowed a re-entry anywhere between 79.1°N and 79.1°S.
Life in orbit
DELTA 1 DEB’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 31 Aug 1991
3 entries
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1991-0372
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1991-0372
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.