Orbit Inclination: 31 degrees
Period: 2913.0 minutes
Perigee: 295.0 km
Apogee: 122219.0 km
Orbit Type: LEO > Low Earth Orbit > Polar Sun-Synchronous

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The Orbiting Geophysical Observatory 3 (OGO 3) was launched on 7 June 1966 and
put into orbit of 295 x 122,219 km at 31 degrees inclination. All 21
experiments returned good data. At the time, this ... was the largest experimental
complement ever put into orbit. There were 4 cosmic ray instruments (1 of which
included a gamma-ray spectrometer), 4 plasma, 2 trapped radiation, 2 magnetic
fields, 5 ionosphere, 3 radio/optical, and 1 micrometeoroid detectors. Again,
the GSFC positron search and gamma-ray spectrometer was included. The
experiment was essentially identical to what was flown on OGO 1, with the PMTs
being replaced by an improved variety. This time, the experiment was successful
in achieving all of its objectives. OGO 3 maintained 3-axis stabilization for
46 days. At that point, an attitude controller failed and the spacecraft was
put into a spin on 23 July 1966. The spin period varied from 90-125 seconds. By
June 1969, data acquisition was limited to 50% of the orbital path. Routine
operation was discontinued on 1 December 1969, and complete termination
occurred on 29 February 1972.

[Summary provided by NASA.]

http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1966-049A