The launch of Roscosmos Proton-K took place on 11 May 1973, launching the Kosmos 557 (DOS-3) mission. The launch site was Baikonur, Kyzylorda Province, Kazakhstan. The payload was deployed in a LEO orbit.
DATE AND TIME
12:20 AM UTC
OPERATOR
LAUNCH SITE
Kyzylorda Province, Kazakhstan
VEHICLE
LEO