Arkady Ilyich Ostashev (Russian: ??????? ????? ???????); September 30, 1925, village Maly Vasilyev, Noginsky District, Moscow Oblast, USSR – July 12, 1998, Moscow, Russian Federation was an engineer-mechanic, Soviet, Russian scientist, participant in the launch of the first artificial Earth satellite and the first cosmonaut, Candidate of Technical Sciences, Docent, laureate of the Lenin and state prizes of the, senior test pilot of missiles and space-rocket complexes of OKB-1, the disciple and companion of Sergei Pavlovich Korolev.