Mission
Luna 15 was capable of studying circumlunar space, the lunar gravitational field, and the chemical composition of lunar rocks. It was also capable of providing lunar surface photography. Luna 15 was placed in an intermediate Earth orbit after launch and was then sent toward the Moon. After a mid-course correction the day after launch, Luna 15 entered lunar orbit at 10:00 UT on 17 July 1969. The spacecraft remained in lunar orbit for two days while controllers checked all on-board systems and performed two orbital maneuvers.
After completing 86 communications sessions and 52 orbits of the Moon at various inclinations and altitudes, it began its descent. Astronauts Armstrong and Aldrin had already set foot on the Moon when Luna 15 fired its main retrorocket engine to initiate descent to the surface at 15:47 UT on 21 July 1969. Transmissions ceased 4 minutes after de-orbit, at a calculated altitude of 3 kilometers. The spacecraft struck the lunar surface on July 21, 1969. The spacecraft had probably crashed into the side of a mountain. Impact coordinates were 17° north latitude and 60° east longitude, in Mare Crisium.
A recording of the minutes in which British technicians at the radio telescope facility in Jodrell Bank observed Luna 15's descent was first made available to the public on 3 July 2009.
Read more about this topic: Luna 15
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