Luna E-6 No.3, also identified as No.2 and sometimes by NASA as Luna 1963B, was a Soviet spacecraft which was lost in a launch failure in 1963. It was a 1,422-kilogram (3,135 lb) Luna E-6 spacecraft, the second of twelve to be launched, and the second consecutive launch failure. It was intended to be the first spacecraft to perform a soft landing on the Moon, a goal which would eventually be accomplished by the final E-6 spacecraft, Luna 9. With the failure of the first E-6 attempt on 4 January 1963, the backup spacecraft and booster G103-10 were stacked atop LC-1 at Baikonur. Luna E-6 No.3 was launched at 09:26:14 UTC on 3 February 1963, atop a Molniya-L 8K78L carrier rocket, flying from Site 1/5 at the Baikonur Cosmodrome.

Wikipedia: https://en.wikipedia.org/wiki/Luna_1963B. Original timeline Wikipedia link: https://en.wikipedia.org/wiki/Luna_program. Related NASA reference: https://nssdc.gsfc.nasa.gov/planetary/tent_launch.html#luna1963b. Description adapted from Wikipedia contributors (CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/).