Names | IMP-F IMP-4 Interplanetary Monitoring Platform-4 | ||||||||||||||||||||||||
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Mission type | Space physics | ||||||||||||||||||||||||
Operator | NASA | ||||||||||||||||||||||||
COSPAR ID | 1967-051A | ||||||||||||||||||||||||
SATCAT no. | 02817 | ||||||||||||||||||||||||
Mission duration | 2 years (achieved) | ||||||||||||||||||||||||
Spacecraft properties | |||||||||||||||||||||||||
Spacecraft | Explorer XXXIV | ||||||||||||||||||||||||
Spacecraft type | Interplanetary Monitoring Platform | ||||||||||||||||||||||||
Bus | IMP | ||||||||||||||||||||||||
Manufacturer | Goddard Space Flight Center | ||||||||||||||||||||||||
Launch mass | 163 kg (359 lb) | ||||||||||||||||||||||||
Dimensions | 71 × 20.3 cm (28.0 × 8.0 in) | ||||||||||||||||||||||||
Power | 4 deployable solar arrays and batteries | ||||||||||||||||||||||||
Start of mission | |||||||||||||||||||||||||
Launch date | 24 May 1967, 14:05:54 GMT[1] | ||||||||||||||||||||||||
Rocket | Delta E1 (Thor 486 / Delta 049) | ||||||||||||||||||||||||
Launch site | Vandenberg, SLC-2E[2] | ||||||||||||||||||||||||
Entered service | 24 May 1967 | ||||||||||||||||||||||||
End of mission | |||||||||||||||||||||||||
Last contact | 3 May 1969 | ||||||||||||||||||||||||
Decay date | 3 May 1969 [3] | ||||||||||||||||||||||||
Orbital parameters | |||||||||||||||||||||||||
Reference system | Geocentric orbit[4] | ||||||||||||||||||||||||
Regime | Highly elliptical orbit | ||||||||||||||||||||||||
Perigee altitude | 2,031 km (1,262 mi) | ||||||||||||||||||||||||
Apogee altitude | 209,242 km (130,017 mi) | ||||||||||||||||||||||||
Inclination | 68.50° | ||||||||||||||||||||||||
Period | 6218.30 minutes | ||||||||||||||||||||||||
Instruments | |||||||||||||||||||||||||
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Explorer 34 (IMP-F, IMP-4), was a NASA satellite launched as part of Explorer program. Explorer 34 as launched on 24 May 1967 from Vandenberg Air Force Base, California, with Thor-Delta E1 launch vehicle. Explorer 34 was the fifth satellite launched as part of the Interplanetary Monitoring Platform program, but was known as "IMP-4" because the preceding launch was more specifically part of the "Anchored IMP" sub-program.[5] The spacecraft was put into space between the launches of Explorer 33 (IMP-D / AIMP-1) in 1966 and Explorer 35 (IMP-E / AIMP-2) in July 1967, but the next satellite to use Explorer 34's general design was Explorer 41 (IMP-G / IMP-5), which flew in 1969.[6]