 Luna 16 | |
| Mission type | Lunar sample return |
|---|---|
| Operator | Soviet space program |
| COSPAR ID | 1970-072A |
| SATCATno. | 4527 |
| Mission duration | 12 days |
| Spacecraft properties | |
| Bus | Ye-8-5 |
| Manufacturer | GSMZ Lavochkin |
| Launch mass | 5,725 kg (12,621 lb)[1] |
| Landing mass | 1,880 kg (4,140 lb)[2] |
| Start of mission | |
| Launch date | 12 September 1970, 13:25:52 (1970-09-12UTC13:25:52Z) UTC[1] |
| Rocket | Proton-K/D |
| Launch site | Baikonur81/23 |
| End of mission | |
| Landing date | 24 September 1970, 05:25 (1970-09-24UTC05:26Z) UTC |
| Landing site | 47°24′N68°36′E / 47.400°N 68.600°E /47.400; 68.600[3] |
| Orbital parameters | |
| Reference system | Selenocentric |
| Semi-major axis | 6,488.8 km (4,032.0 mi) |
| Eccentricity | 0 |
| Periselene altitude | 111 km (69 mi) |
| Aposelene altitude | 111 km (69 mi) |
| Inclination | 70° |
| Period | 119 minutes |
| Epoch | 18 September 1970 |
| Lunar orbiter | |
| Orbital insertion | 17 September 1970 |
| Orbits | ~36 |
| Lunar lander | |
| Landing date | 20 September 1970, 05:18 UTC |
| Return launch | 21 September 1970, 07:43 UTC |
| Landing site | 0°30′49″S56°21′50″E / 0.5137°S 56.3638°E /-0.5137; 56.3638 |
| Sample mass | 101 grams (3.6 oz) |
| Instruments | |
| Stereo photographic imaging system Remote arm for sample collection Radiation detector | |
Luna 16 was anuncrewed 1970 space mission, part of theSovietLuna program. It was the firstrobotic probe to land on theMoon and return a sample oflunar soil to Earth.[4][5] The 101 grams (3.56 ounces) sample was returned fromMare Fecunditatis. It represented the first successfullunar sample return mission by theSoviet Union and was the third lunarsample return mission overall.
The spacecraft consisted of two attached stages, an ascent stage mounted on top of a descent stage. The descent stage was a cylindrical body with four protruding landing legs, fuel tanks, a landing radar, and a dual descent-engine complex.
A main descent engine was used to slow the craft until it reached a cutoff point, which was determined by the on-board computer based on altitude and velocity. After cutoff a bank of lower-thrust jets was used for the final landing. The descent stage also acted as a launch pad for the ascent stage.
The ascent stage was a smaller cylinder with a rounded top. It carried a cylindrical hermetically sealed soil-sample container inside a re-entry capsule.
The spacecraft descent stage was equipped with a television camera, radiation and temperature monitors, telecommunications equipment, and an extendable arm with a drilling rig for the collection of a lunar soil sample.
TheLuna 16 automated station was launched toward the Moon from a preliminary Earth orbit and after one mid-course correction on 13 September it entered a circular 111 km with 70° inclination lunar orbit on 17 September 1970.The lunar gravity was studied from this orbit. After two orbital adjustments were performed on 18 and 19 September theperilune was decreased to 15.1 km, as well as the inclination altered in preparation for landing. At perilune at 05:12 UTC on 20 September, the main braking engine was fired, initiating the descent to the lunar surface. Six minutes later, at 05:18 UT, the spacecraft safely soft-landed in its target area at 0°41' south latitude and 56°18' east longitude, in the northeast area ofMare Fecunditatis (Sea of Fertility) approximately 100 kilometers west ofWebb crater and 150 km north ofLangrenus crater.
This was the first landing made in lunar night, as the Sun had set about 60 hours earlier. The main descent engine cut off at an altitude of 20 m, and the landing jets cut off at 2 m height at a velocity less than 2.4 m/s, followed by vertical free fall. The mass of the spacecraft at landing was 1,880 kilograms. 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 seven minutes, the drill reached a stop at 35 centimeters depth and then withdrew its sample and lifted it in an arc to the top of the spacecraft, depositing the lunar material in a small spherical capsule mounted on the main spacecraft bus. The column ofregolith in the drill tube was then transferred to the soil sample container.[2]
After 26 hours and 25 minutes on the lunar surface, at 07:43 UT on 21 September, the spacecraft's upper stage lifted off from the Moon. The lower stage ofLuna 16 remained on the lunar surface and continued transmission of lunar temperature and radiation data. Three days later, on 24 September, after a direct ascent traverse with no mid-course corrections, the capsule, with its 101 grams of lunar soil, reentered Earth's atmosphere at a velocity of 11 kilometers per second. The capsule parachuted down 80 kilometers southeast of the town ofJezkazgan inKazakhstan at 05:25 UT on 24 September 1970. Analysis of the dark basalt material indicated a close resemblance to soil recovered by the AmericanApollo 12 mission.[2]
According to theBochum Observatory inGermany, strong and good-quality television pictures were returned by the spacecraft.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 an extraterrestrial body.
A 0.4825 g sample of material from a depth of 27 cm was sent to Britain.[6]
| Lunar Mission | Sample Returned | Year |
|---|---|---|
| Luna 16 | 101 g (3.6 oz)[7] | 1970 |
| Luna 20 | 30 g (1.1 oz)[8] | 1972 |
| Luna 24 | 170 g (6.0 oz)[9] | 1976 |
Three tiny samples (0.2 grams) of theLuna 16 soil were sold atSotheby's auction for $442,500 in 1993.[10] The samples were resold by Sotheby's forUS$855,000 on 29 November 2018.[11]
A series of 10-kopeckstamps was issued in 1970 to commemorate the flight ofLuna 16 lunar probe and depicted the main stages of the programme: soft landing on Moon, launch of the lunar soil sample return capsule, and parachute assisted landing back on Earth.
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Replicas of Luna 16 are on display at theMemorial Museum of Cosmonautics andTsiolkovsky State Museum of the History of Cosmonautics.
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