EntityQ906164· pop 6· linked from 61 articlesDiscoverer 7Sign in to saveAmerican military reconnaissance satelliteConnectionsCoronaEntityUnited States Air ForceEntityThor-AgenaEntityInternational Standard Book NumberEntityorbital periodEntityapsisEntityOCLC, Inc.EntityGeneral ElectricCompanylow Earth orbitEntityLuna 1Entityorbital inclinationEntityUnited States Department of DefenseConceptLuna 2Entityorbital eccentricityEntityepochEntityLockheed U-2EntityDefense Advanced Research Projects AgencyEntityLuna 3Entityreconnaissance satelliteEntityLockheed CorporationEntityCategoriesSpacecraft launched in 1959Spacecraft which reentered in 1959