CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1961-0033
EXPLORER 13
EXPLORER 13 (NORAD 180) came down while still attached to its host on 28 August 1961, after 3 days in orbit.
Official date
NORAD number
180
International designator
1961-022A
Object type
Spacecraft
Country
United States
Launched
25 Aug 1961Wallops
Re-entered (UTC)
28 Aug 1961UTC calendar day
Time in orbit
3 days3 days
How it ended
Came down attached to its host
Latitude range
36.4°N to 36.4°SFinal inclination 36.4°
Mass
62 kg
Operator
NASA LaRC
Built by
NASA LaRC
Bus
S-55
Programme
Explorer MME
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 36.4°, allowed a re-entry anywhere between 36.4°N and 36.4°S.
Life in orbit
3 days
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1961-0033
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1961-0033
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.