 Following launch, Pegasus 1 was given the COSPAR designation 1965-009A, while NORAD assigned it the Satellite Catalog Number 01085.

Pegasus 1 was a secondary payload of Apollo program mission AS-103, which also carried a boilerplate Apollo spacecraft BP-16.The Apollo boilerplate acted as a payload fairing for the Pegasus spacecraft, which was stored inside what would have been the Service Module of a functional spacecraft.Upon reaching orbit, the boilerplate Command and Service modules were jettisoned.