Luna 16
Luna 16
Mission typeLunar sample return
COSPAR ID1970-072A
SATCAT no.4527
Mission duration12 days
Spacecraft properties
BusYe-8-5
ManufacturerGSMZ Lavochkin
Launch mass5,725 kg (12,621 lb)[1]
Landing mass1,880 kg (4,140 lb) [2]
Start of mission
Launch date12 September 1970, 13:25:52 (1970-09-12UTC13:25:52Z) UTC[3]
RocketProton-K/D
Launch siteBaikonur 81/23
End of mission
Landing date24 September 1970, 05:25 (1970-09-24UTC05:26Z) UTC
Landing site47°24′N 68°36′E / 47.400°N 68.600°E / 47.400; 68.600[4]
Orbital parameters
Reference systemSelenocentric
Semi-major axis6,488.8 km (4,032.0 mi)
Eccentricity0
Periselene altitude111 km (69 mi)
Aposelene altitude111 km (69 mi)
Inclination70°
Period119 minutes
Epoch18 September 1970
Lunar orbiter
Orbital insertion17 September 1970
Orbits~36
Lunar lander
Landing date20 September 1970, 05:18 UTC
Return launch21 September 1970, 07:43 UTC
Landing site0°30′49″S 56°21′50″E / 0.5137°S 56.3638°E / -0.5137; 56.3638
Sample mass101 grams (3.6 oz)
Instruments
Stereo photographic imaging system
Remote arm for sample collection
Radiation detector
 

Luna 16 was an uncrewed 1970 space mission, part of the Soviet Luna program. It was the first robotic probe to land on the Moon and return a sample of lunar soil to Earth.[5][6] The 101 grams (3.56 ounces) sample was returned from Mare Fecunditatis. It represented the first successful lunar sample return mission by the Soviet Union and was the third lunar sample return mission overall.

Overview

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.

Mission summary

The Luna 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 the perilune 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 of Mare Fecunditatis (Sea of Fertility) approximately 100 kilometers west of Webb crater and 150 km north of Langrenus crater.

This was the first landing made in the lunar night side, 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 of regolith 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 of Luna 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 of Jezkazgan 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.[2]

According to the Bochum Observatory in Germany, 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.[7]

Legacy

Lunar
Mission		 Sample
Returned		 Year
Luna 16 101 g (3.6 oz)[8] 1970
Luna 20 30 g (1.1 oz)[9] 1972
Luna 24 170 g (6.0 oz)[10] 1976

Three tiny samples (0.2 grams) of the Luna 16 soil were sold at Sotheby's auction for $442,500 in 1993.[11] The samples were resold by Sotheby's for US$855,000 on 29 November 2018.[12]

A series of 10-kopeck stamps was issued in 1970 to commemorate the flight of Luna 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.

Replicas of Luna 16 are on display at the Memorial Museum of Cosmonautics and Tsiolkovsky State Museum of the History of Cosmonautics.

See also

References

  1. ↑ Siddiqi, Asif (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (PDF) (second ed.). NASA History Program Office.
  2. 1 2 3 Solar System Log by Andrew Wilson (pp.60–63), Jane's Publishing Company Limited, 1987, ISBN 0 7106 0444 0
  3. ↑ Siddiqi, Asif (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (PDF) (second ed.). NASA History Program Office.
  4. ↑ "Soviet and Russian Lunar Exploration" (PDF). p. 314. Archived (PDF) from the original on 2019-07-29.
  5. ↑ Burrows, William E. (1999). This New Ocean: The Story of the First Space Age. Modern Library. p. 432. ISBN 0-375-75485-7.
  6. ↑ Siddiqi, Asif A. (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (PDF). The NASA history series (second ed.). Washington, DC: NASA History Program Office. p. 1. ISBN 9781626830424. LCCN 2017059404. SP2018-4041.
  7. ↑ Pillinger, Colin Trevor; Gowar, A.P (4 January 1977). "The separation and subdivision of two 0.5g samples of lunar soil collected by the Luna 16 and 20 missions". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 284 (1319): 137–143. Bibcode:1977RSPTA.284..137P. doi:10.1098/rsta.1977.0003. S2CID 119730403.
  8. ↑ "NASA - NSSDC - Spacecraft – Details". nssdc.gsfc.nasa.gov. Retrieved 2015-11-08.
  9. ↑ "NASA – NSSDC – Spacecraft – Details". nssdc.gsfc.nasa.gov. Retrieved 2015-11-08.
  10. ↑ "NASA – NSSDC – Spacecraft – Details". nssdc.gsfc.nasa.gov. Retrieved 2015-11-08.
  11. ↑ NY Times story, "F.B.I. Revisits Earthly Theft of Moon Rock
  12. ↑ "THE ONLY KNOWN DOCUMENTED SAMPLES OF THE MOON AVAILABLE FOR PRIVATE OWNERSHIP". Sothebys.com. 29 November 2018.
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