The Luna 8 reference article from the English Wikipedia on 24-Jul-2004
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Luna 8

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Luna 8 was an unmanned space mission of the Luna program, also called Lunik 8. Luna 8 was launched with the probable mission of achieving a soft landing on the Moon. However, the retrofire was late, and the spacecraft impacted the lunar surface in the Sea of Storms. The mission did complete the experimental development of the star-orientation system and ground control of radio equipment, flight trajectory, and other instrumentation.

Preceded by :
Luna 7
Luna program Followed by :
Luna 9