Explorer 41

Explorer 41
	Explorer 41 satellite
Names	IMP-G; IMP-5; Interplanetary Monitoring Platform-5
Mission type	Space physics
Operator	NASA
COSPAR ID	1969-053A
SATCAT no.	03990
Mission duration	3.5 years (achieved)
Spacecraft properties
Spacecraft	Explorer XLI
Spacecraft type	Interplanetary Monitoring Platform
Bus	IMP
Manufacturer	Goddard Space Flight Center
Launch mass	175 kg (386 lb)
Start of mission
Launch date	21 June 1969, 08:47:58 GMT
Rocket	Thor-Delta E1 (Thor 482 / Delta 069)
Launch site	Vandenberg, SLC-2W
Contractor	Douglas Aircraft Company
Entered service	21 June 1969
End of mission
Last contact	23 December 1972
Decay date	23 December 1972
Orbital parameters
Reference system	Geocentric orbit
Regime	Highly elliptical orbit
Perigee altitude	3,920 km (2,440 mi)
Apogee altitude	172,912 km (107,443 mi)
Inclination	85.10°
Period	4840.90 minutes
Instruments
Instruments
	Channeltron Electron Detector
	Cosmic-Ray Anisotropy
	Cosmic-Ray Energy versus Energy Loss
	Cosmic-Ray Proton (R vs DE/DX)
	Electrostatic Analyzer
	Ion Chamber
	Low-Energy Proton and Alpha Detector
	Low-Energy Proton and Electron Differential Energy Analyzer (LEPEDEA)
	Low-Energy Proton and Electron Differential Energy Analyzer (LEPEDEA 2)
	Low-Energy Solid-State Telescope
	Solar Proton Monitoring Experiment
	Triaxial Fluxgate Magnetometer
	Explorer program

Explorer 41, also called as IMP-G and IMP-5, was a NASA satellite launched as part of Explorer program. Explorer 41 as launched on 21 June 1969 on Vandenberg AFB, California, with a Thor-Delta E1 launch vehicle. Explorer 41 was the seventh satellite launched as part of the overall Interplanetary Monitoring Platform series, though it received the post-launch designation "IMP-5" because two previous flights had used the "AIMP" ("Anchored IMP") designation instead. It was preceded by the second of those flights, Explorer 35 ([A]IMP-E / AIMP-2), launched in July 1967. Its predecessor in the strict IMP series of launches was Explorer 34, launched in May 1967, which shared a similar design to Explorer 41. The next launch was of an IMP satellite was Explorer 43 (IMP-I / IMP-6) in 1971.

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