Thor DM-21 Ablestar | Transit 1B
Launch Successful
L - -- : -- : -- : --
Instantaneous launch window.
Launch Window
April 13, 1960, 12:02 p.m. - April 13, 1960, 12:02 p.m.
Instantaneous launch window.
April 13, 1960, 12:02 p.m. - April 13, 1960, 12:02 p.m.
The Transit system was the first satellite navigation system to be used operationally. The system was primarily used by the U.S. Navy to provide accurate location information to its Polaris ballistic missile submarines, and it was also used as a navigation system by the Navy's surface ships, as well as for hydrographic survey and geodetic surveying.
The Thor-Ablestar, or Thor Able-Star, also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile, with an Ablestar upper stage. It was a member of the Thor family of rockets, and was derived from the Thor-Able.
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