CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1961-0044
SRV 520
SRV
SRV 520 (NORAD 90) re-entered Earth’s atmosphere on 31 October 1961, after 8 months in orbit.
Official dateIdentified from the historical record
NORAD number
90
International designator
1961-005D
Object type
Spacecraft
Official listing
DISCOVERER 20 DEBListed as a fragment
Country
United States
Launched
17 Feb 1961Vandenberg
Re-entered (UTC)
31 Oct 1961UTC calendar day
Time in orbit
8 months256 days
How it ended
Re-entered (natural decay)
Latitude range
80.7°N to 80.7°SFinal inclination 80.7°
Mass
127 kg
Operator
USAF BMD / CIA
Built by
GE/RSD
Bus
SRV Mk V
Programme
SRV
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 80.7°, allowed a re-entry anywhere between 80.7°N and 80.7°S.
Life in orbit
8 monthsSRV 520’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1961-005
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1961-0044
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1961-0044
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.