\<COLOUR 1> SIZE: \<COLOUR 0> Sphere, 91 cm diameter
\<COLOUR 1> WEIGHT: \<COLOUR 0> 121 kg
\<COLOUR 1> COUNTRY: \<COLOUR 0> USA
\<COLOUR 1> COMMENTS: \<COLOUR 0> The first navigation-satellite; more than 30 satellites are launched with this name; Transit 5A-1 (launched December 19, 1962, by Scout launch vehicle from Vandenberg Air Force Base) is the first to become operational; satellites sometimes termed Oscar, causing confusion with Oscar amateur radio satellites.