Relay 2 was launched atop a Delta B rocket on January 21, 1964 from LC-17B at Cape Canaveral Air Force Station, and was physically similar to Relay 1. Design changes in this satellite improved its performance to the point where response to spurious commands was essentially eliminated. One of the two onboard transponders operated normally until November 20, 1966. From that time until its failure on January 20, 1967, it required a longer time than normal to come on. The other transponder continued to operate until June 9, 1967, when it too failed to operate normally.
COSPAR satellite ID: Relay 2 1964-003A
Read more about this topic: Relay Program