AIMP-1 (also known as AIMP-D or IMP-D or Explorer 33, NSSDC ID: 66-058A) was launched into a lunar orbit in order to 'anchor' it to the lunar distance from the earth. AIMP-1 was a spin-stabilized spacecraft with spin axis parallel to the ecliptic plane, and spin period varying between 2.2 sec and 3.6 sec. The spacecraft was instrumented for studies of interplanetary plasma, energetic charged particles [electrons, protons and helium ions (alpha particles)], magnetic fields, and solar X-rays at lunar distances. Unfortunately, the spacecraft failed to achieve lunar orbit but did achieve major mission objectives. The initial AIMP-1 apogee occurred at about 16:00 hour local time. Over the first 3-year period, perigee varied between 6 earth radii and 44 earth radii and apogee varied between 70 earth radii and 135 earth radii. The inclination with respect to the equatorial plane of the earth varied between 7 degrees and 60 degrees.
Group: Platform_Details
Entry_ID: EXPLORER-33
Group: Platform_Identification
Platform_Category: Solar/Space Observation Satellites
Platform_Series_or_Entity: EXPLORER
Short_Name: EXPLORER-33
Long_Name: Interplanetary Monitoring Platform D (IMP-D)
End_Group
Group: Synonymous_Platform_Names
Short_Name: Explorer 33
Short_Name: AIMP-D
Short_Name: IMP-D
End_Group
Group: Orbit
Orbit_Inclination: 24.4 degrees
Period: 3879 min
Perigee: 2657 km
Apogee: 4808 km
End_Group
Creation_Date: 2007-12-14
Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1966-058A
Sample_Image: http://nssdc.gsfc.nasa.gov/image/spacecraft/explorer33.jpg
Group: Platform_Logistics
Launch_Date: 1966-07-01
Launch_Site: Cape Canaveral/Kennedy Space Center, USA
Primary_Sponsor: NASA
End_Group
End_Group (en)