CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0493
EXPLORER 37 (SE-B)
EXPLORER 37 (SE-B) (NORAD 3141) re-entered Earth’s atmosphere on 16 November 1990, after 22 years, 8 months in orbit.
Official date
NORAD number
3141
International designator
1968-017A
Object type
Spacecraft
Country
United States
Launched
5 Mar 1968Wallops
Re-entered (UTC)
16 Nov 1990UTC calendar day
Time in orbit
22 years, 8 months8,291 days
How it ended
Re-entered (natural decay)
Latitude range
59.3°N to 59.3°SFinal inclination 59.3°
Mass
119 kg
Operator
NRL
Built by
NRL
Bus
SR 9
Programme
Solrad
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 59.3°, allowed a re-entry anywhere between 59.3°N and 59.3°S.
Life in orbit
22 years, 8 monthsEXPLORER 37 (SE-B)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 16 Nov 1990
2 entriesFrom the same launch
1968-017
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0493
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0493
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.