Mission type | Lunar sample return |
---|---|
COSPAR ID | 1971-073A |
SATCAT no. | 5448 |
Mission duration | 9 days (launch day to day of last contact) |
Spacecraft properties | |
Bus | Ye-8-5 |
Manufacturer | GSMZ Lavochkin |
Launch mass | 5,725 kilograms (12,621 lb) [1] |
Dry mass | 5,600 kilograms (12,300 lb)[ citation needed ] |
Start of mission | |
Launch date | 2 September 1971, 13:40:40 UTC [2] |
Rocket | Proton-K/D |
Launch site | Baikonur 81/24 |
End of mission | |
Last contact | 11 September 1971, 07:48 UTC |
Orbital parameters | |
Reference system | Selenocentric |
Eccentricity | 0.001361 |
Periselene altitude | 1,824.9 kilometres (1,133.9 mi) |
Aposelene altitude | 1,842.3 kilometres (1,144.8 mi) |
Inclination | 35 degrees |
Period | 119 minutes |
Epoch | 6 September 1971, 20:00:00 UTC [3] |
Lunar orbiter | |
Orbital insertion | 7 September 1971 |
Orbits | ~48 |
Lunar impact (failed landing) | |
Impact date | 11 September 1971 07:48 UTC |
Impact site | 3°34′N56°30′E / 3.567°N 56.500°E |
Instruments | |
Stereo photographic imaging system Remote arm for sample collection Radiation detector Radio altimeter | |
Luna 18, part of the Ye-8-5 series, was an uncrewed space mission of the Luna program.
Luna 18 was placed in an Earth parking orbit after it was launched and was then sent towards the Moon. On 7 September 1971, it entered lunar orbit. The spacecraft completed 85 communications sessions and 54 lunar orbits before it was sent towards the lunar surface by use of braking rockets. It impacted the Moon on 11 September 1971, at 3 degrees 34 minutes N, 56 degrees 30 minutes E (selenographic coordinates) in rugged mountainous terrain. Signals ceased at the moment of impact.
This mission was the seventh Soviet attempt to recover soil samples from the surface of the Moon and the first after the success of Luna 16. After two mid-course corrections on 4 September and 6 September 1971, Luna 18 entered a circular orbit around the Moon on 7 September at 100 kilometers altitude with an inclination of 35°. After several more orbital corrections, on 11 September, the vehicle began its descent to the lunar surface. Contact with the spacecraft was lost at 07:48 UT at the previously determined point of lunar landing. Impact coordinates were 3°34' north latitude and 56°30' east longitude, near the edge of the Mare Fecunditatis ("Sea of Fertility"). Officially, the Soviets announced that "the lunar landing in the complex mountainous conditions proved to be unfavorable." Later, in 1975, the Soviets published data from Luna 18's continuous-wave radio altimeter that determined the mean density of the lunar topsoil.
Luna 4, or E-6 No.4, sometimes known in the West as Sputnik 26, was a Soviet spacecraft launched as part of the Luna program to attempt the first soft landing on the Moon. Following a successful launch, the spacecraft failed to perform a course correction and as a result it missed the Moon, remaining instead in Earth orbit.
The Luna programme, occasionally called Lunik by western media, was a series of robotic spacecraft missions sent to the Moon by the Soviet Union between 1959 and 1976. The programme accomplished many firsts in space exploration, including first flyby of the Moon, first impact of the Moon and first photos of the far sise of the Moon. Each mission was designed as either an orbiter or lander. They also performed many experiments, studying the Moon's chemical composition, gravity, temperature, and radiation.
Luna 9 (Луна-9), internal designation Ye-6 No.13, was an uncrewed space mission of the Soviet Union's Luna programme. On 3 February 1966, the Luna 9 spacecraft became the first spacecraft to achieve a survivable landing on a celestial body.
Luna 10 was a 1966 Soviet lunar robotic spacecraft mission in the Luna program. It was the first artificial satellite of the Moon.
Luna 11 was an uncrewed space mission of the Soviet Union's Luna program. It was also called Lunik 11. Luna 11 was launched towards the Moon from an Earth-orbiting platform and entered lunar orbit on 27 August 1966.
Luna 12 was an unmanned space mission of the Luna program, also called Lunik 12.
Luna 13 was an uncrewed space mission of the Luna program by Soviet Union.
Luna 14 was an uncrewed space mission of the Luna program run by the Soviet Union. It was also called Lunik 14.
Luna 15 was a robotic space mission of the Soviet Luna programme, that was in lunar orbit together with the Apollo 11 Command module Columbia.
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. The 101 grams 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.
LOK Luna 17 was an uncrewed space mission of the Luna program, also called Lunik 17. It deployed the first robotic rover onto the surface of the Moon.
Luna 19, was an uncrewed space mission of the Luna program. Luna 19 extended the systematic study of lunar gravitational fields and location of mascons. It also studied the lunar radiation environment, the gamma-active lunar surface, and the solar wind. Photographic coverage via a television system was also obtained.
Luna 20 was the second of three successful Soviet lunar sample return missions. It was flown as part of the Luna program as a robotic competitor to the six successful Apollo lunar sample return missions.
Luna 21 was an uncrewed space mission, and its spacecraft, of the Luna program, also called Lunik 21, in 1973. The spacecraft landed on the Moon and deployed the second Soviet lunar rover, Lunokhod 2. The primary objectives of the mission were to collect images of the lunar surface, examine ambient light levels to determine the feasibility of astronomical observations from the Moon, perform laser ranging experiments from Earth, observe solar X-rays, measure local magnetic fields, and study mechanical properties of the lunar surface material.
Luna 22 was an uncrewed space mission, part of the Soviet Luna program, also called Lunik 22.
Luna 23 was an uncrewed space mission of the Luna program developed by the Soviet Union.
Luna 24 was a robotic probe of the Soviet Union's Luna programme. The 24th mission of the Luna series of spacecraft, the mission of the Luna 24 probe was the third Soviet mission to return lunar soil samples from the Moon. The probe landed in Mare Crisium. The mission returned 170.1 g (6.00 oz) of lunar samples to the Earth on 22 August 1976.
Zond 8, also known as L-1 No.14, was the last in the series of circumlunar spacecraft, a member of the Soviet Zond program, designed to rehearse a piloted circumlunar flight, an uncrewed version of Soyuz 7K-L1 crewed circumlunar flight spacecraft. The project was initiated in 1965 to compete with the Americans in the race to the Moon but lost its importance once three astronauts orbited the Moon on the Apollo 8 mission in December 1968.
The Lunar Orbiter 3 was a spacecraft launched by NASA in 1967 as part of the Lunar Orbiter Program. It was designed primarily to photograph areas of the lunar surface for confirmation of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data.
A Moon landing or lunar landing is the arrival of a spacecraft on the surface of the Moon. This includes both crewed and robotic missions. The first human-made object to touch the Moon was the Soviet Union's Luna 2, on 13 September 1959.