CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1991-0347
THOR ABLESTAR DEB
THOR ABLESTAR DEB (NORAD 540) re-entered Earth’s atmosphere on 20 August 1991.
Official dateFragment record
NORAD number
540
International designator
1961-015FZ
Object type
Fragment
Country
United States
Parent launched
29 Jun 1961Cape Canaveral
Re-entered (UTC)
20 Aug 1991UTC calendar day
Time since launch
30 years, 1 month11,009 days
How it ended
Re-entered (natural decay)
Latitude range
66.8°N to 66.8°SFinal inclination 66.8°
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 66.8°, allowed a re-entry anywhere between 66.8°N and 66.8°S.
Life in orbit
THOR ABLESTAR DEB’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 20 Aug 1991
1 entry
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1991-0347
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1991-0347
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.