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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.]
Group: Platform_Details Entry_ID: OGO-3 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: OGO (Orbiting Geophysical Observatory) Short_Name: OGO-3 Long_Name: Orbiting Geophysical Observatory-3 End_Group Group: Synonymous_Platform_Names Short_Name: EOGO 3 Short_Name: OGO-B Short_Name: 02195 End_Group Group: Platform_Associated_Instruments Short_Name: GAMMA RAY SPECTROMETERS End_Group Group: Orbit 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 End_Group Creation_Date: 2007-02-13 Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1966-049A Sample_Image: http://heasarc.gsfc.nasa.gov/Images/ogo/ogo.gif Group: Platform_Logistics Launch_Date: 1966-06-07 Launch_Site: Cape Canaveral/Kennedy Space Center, USA Primary_Sponsor: NASA End_Group End_Group
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