CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0134
DELTA 1 R/B
DELTA 1 R/B (NORAD 7971) re-entered Earth’s atmosphere on 9 April 1981, after 5 years, 9 months in orbit.
Official date
NORAD number
7971
International designator
1975-057B
Object type
Rocket body
Country
United States
Launched
21 Jun 1975Cape Canaveral
Re-entered (UTC)
9 Apr 1981UTC calendar day
Time in orbit
5 years, 9 months2,119 days
How it ended
Re-entered (natural decay)
Latitude range
32.9°N to 32.9°SFinal inclination 32.9°
Mass
845 kg
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 32.9°, allowed a re-entry anywhere between 32.9°N and 32.9°S.
Life in orbit
5 years, 9 monthsDELTA 1 R/B’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 9 Apr 1981
1 entryFrom the same launch
1975-057
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0134
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0134
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.