CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1975-0407
DELTA 1 R/B(1)
DELTA 1 R/B(1) (NORAD 6438) re-entered Earth’s atmosphere on 18 October 1975, after 2 years, 5 months in orbit.
Official date
NORAD number
6438
International designator
1973-023B
Object type
Rocket body
Country
United States
Launched
20 Apr 1973Cape Canaveral
Re-entered (UTC)
18 Oct 1975UTC calendar day
Time in orbit
2 years, 5 months911 days
How it ended
Re-entered (natural decay)
Latitude range
29.4°N to 29.4°SFinal inclination 29.4°
Mass
756 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 29.4°, allowed a re-entry anywhere between 29.4°N and 29.4°S.
Life in orbit
2 years, 5 monthsDELTA 1 R/B(1)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 18 Oct 1975
1 entryFrom the same launch
1973-023
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1975-0407
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1975-0407
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.