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Luna 4
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Luna 4, or E-6 No.4 was a Soviet spacecraft launched as part of the Luna program to attempt the first soft landing on the Moon. Following a successful launch, the spacecraft failed to perform a course correction and as a result it missed the moon, remaining instead in Earth orbit.
==Mission==
Luna 4 was launched by a Molniya-L carrier rocket at 08:16:37 UTC on 2 April 1963. Launch occurred from Site 1/5 at the Baikonur Cosmodrome. After reaching an initial parking orbit of , the rocket's upper stage restarted to place Luna 4 onto a translunar trajectory.
The spacecraft did not perform a required midcourse correction manoeuvre, which resulted in it missing the Moon by at 13:25 UT on April 5, 1963. It then entered a barycentric 90,000 × 700,000 km Earth orbit. A lecture program entitled "Hitting the Moon" was scheduled to be broadcast on Radio Moscow at 7:45 p.m. the evening of April 5 but was cancelled. The spacecraft transmitted at 183.6 MHz at least until April 6.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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