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- Helios 2 was launched into a solar orbit on 15 January 1976. It had a perihelion of 0.29 AU and an aphelion of 1 AU. Its orbit made it an ideal platform for making long baseline time-of-arrival measurements to obtain source direction. The satellite rotated with a ~ 1-s spin period. The mission ended in 1981. Information provided by http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/helios2.html Group: Platform_Details Entry_ID: HELIOS 2 Group: Platform_Identification Platform_Category: Solar/Space Observation Satellites Short_Name: HELIOS 2 End_Group Group: Synonymous_Platform_Names Short_Name: HELIOS 2 Short_Name: 08582 End_Group Group: Platform_Associated_Instruments Short_Name: SCINTILLATION COUNTERS End_Group Group: Orbit Orbit_Inclination: 0.0° Period: 185.6 days End_Group Creation_Date: 2007-08-13 Online_Resource: http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/helios2.html Online_Resource: http://www.cnes.fr/web/CNES-en/2743-helios-ii-a-new-generation-of-military-satellites.php Sample_Image: http://heasarc.gsfc.nasa.gov/Images/misc_missions/helios2.gif Group: Platform_Logistics Launch_Date: 1976-01-15 Launch_Site: Cape Canaveral/Kennedy Space Center, USA Primary_Sponsor: USA/NASA Primary_Sponsor: Germany End_Group End_Group
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