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Explorer 28
Explorer 21 IMP-B.jpg
COSPAR ID1965-042A
SATCAT no.01388Edit this on Wikidata
Mission duration~2 Years
Spacecraft properties
Dry mass58 kilograms (128 lb)
PowerSolar Panels
Start of mission
Launch date29 May 1965 (1965-05-29)
Launch siteCape Canaveral
End of mission
Last contact12 May 1967 (1967-05-13)
Decay date4 July 1968[1]
Orbital parameters
Reference systemGeocentric
Perigee altitude32,290 km (20,060 mi)
Apogee altitude227,456 km (141,335 mi)
Period107.6 minutes
Radio Beacon, Langmuir probe

Explorer 28 (or IMP-C) was a satellite launched in May 1965 to study Space physics. It was powered by chemical batteries and Solar panels. There were 7 experiments on board, all devoted to particle studies. Performance was normal until mid-April 1967, when intermittent problems began. It stayed in contact until May 12, 1967, when contact was lost. The orbit kept going lower and lower until it re-entered on July 4, 1968.[2]


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This page was last edited on 6 March 2021, at 17:08
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