Date: 12 Sep 1970
Luna 16 was a landmark success for the Soviets in their deep space exploration program; the mission accomplished the first fully automatic recovery of soil samples from the surface of the moon. (The success came after five failures.)
On 17 September 1970, after a successful coast to the moon (which included one mid-course correction), Luna 16 entered circular lunar orbit (at 110 km with a a 70 degree inclination). Two further orbital adjustments on 18 and 19 September altered both altitude and inclination in preparation for descent to the moon.
At perilune at 05:12 UT on 20 September, Luna 16 fired its main engine to begin its descent to the surface. Six minutes later, the spacecraft safely soft-landed in its target area at 0 degree, 41' south latitude and 56 degree, 18' east longitude, in the northeast area of the Sea of Fertility, approximately 100 km east of Webb crater.
The mass of the spacecraft at landing was 1,880 kg. Less than an hour after landing, at 06:03 UT, an automatic drill penetrated the lunar surface to collect a soil sample. After drilling for 7 minutes, the drill reached a stop at 35 mm depth and then withdrew its sample and lifted it in an arc to the top of the spacecraft, depositing the precious cargo in a small spherical capsule mounted on the main spacecraft bus.
Finally, at 07:43 UT on 21 September, the spacecraft's upper stage lifted off from the moon. Three days later, after a direct ascent traverse with no mid-course corrections, the capsule, with its 105 grams of lunar soil, reentered Earth's atmosphere at a velocity of 11 km per second.
The capsule parachuted down 80 km southeast of the town of Dzhezkazgan in Kazakhstan at 05:25 UT on 24 September 1970. Analysis of the dark basalt material indicated a close resemblance to soil recovered by the American Apollo 12 mission.
Credit: NSSDC Photo Gallery