Orbit Inclination: 81.4 degrees
Period: 116.3 minutes
Perigee: 525 km
Apogee: 2498 km
Orbit Type: LEO > Low Earth Orbit > Polar Sun-Synchronous

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Explorer 24 was placed in orbit together with Explorer 25 from a single launch vehicle. Explorer 24 was identical in configuration to the previously launched balloon satellites Explorer 9 and 19. ... The spacecraft was 3.6 m in diameter, was built of alternating layers of aluminum foil and plastic film, and was covered uniformly with 5.1-cm white dots for thermal control. It was designed to yield atmospheric density near perigee as a function of space and time from sequential observations of the sphere's position in orbit. To facilitate ground tracking, the satellite carried a 136-MHz tracking beacon. The satellite reentered the earth's atmosphere on October 18, 1968.

http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1964-076A

http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1964-076A