Payload
EXPLORER 18 (IMP-1)
DecayedPayloadHEO
Explorer 18, also called IMP-A, IMP-1, Interplanetary Monitoring Platform-1 and S-74, was a NASA satellite launched as part of the Explorer program. Explorer 18 was launched on 27 November 1963 from Cape Canaveral Air Force Station (CCAFS), Florida, with a Thor-Delta C launch vehicle. Explorer 18 was the first satellite of the Interplanetary Monitoring Platform (IMP). Explorer 21 (IMP-B) launched in October 1964 and Explorer 28 (IMP-C) launched in May 1965 also used the same general spacecraft design.
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Launch
- Launch date
- November 27, 1963 at 02:30 AM UTC
- Launch site
- Cape Canaveral SFS, USA
- Launched by
- Thor Delta C →
- Operator
- United States Air Force
- Mission
- Explorer 18
- Launch record
- View full launch →
Orbit
- Orbit regime
- HEO
- Apoapsis
- 192,044 km
- Periapsis
- 4,386 km
- Inclination
- 35.19°
- Orbital period
- 5610.65 min
Identity
- COSPAR (Int'l)
- 1963-046A
- NORAD catalog №
- 693
- Object type
- Payload
- Owner / operator
United States- Status
- Decayed
- Decay / reentry
- December 30, 1965
End of mission
- Last active / ended
- December 30, 1965
- Time in service
- 2.1 years
- Fate
- Reentered Earth's atmosphere and was destroyed.
- Final status
- Decayed