The Castor A was an Argentine sounding rocket designed in 1969 by the Instituto de Investigaciones Aeronáuticas y Espaciales (IIAE).

[1][2] The rocket featured a two-stage configuration, utilizing five Canopus II rockets (four in the first stage and one in the second).

[1][2] It was capable of placing a 75 kg (165 lb) payload at a 400 km altitude.

[1] Throughout its operational lifespan, the Castor A was launched seven times.

[1][3] It experienced one failure during one of its launches, thus achieving a success rate of approximately 83.3%.