Luna 22
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| Organization: | Soviet Union |
| Major Contractors: | GSMZ Lavochkin |
| Mission Type: | Planetary Science Lunar orbiter |
| Satellite of: | Moon |
| Launch: | May 29, 1974 at 08:57:00 UTC |
| Launch Vehicle: | Proton 8K82K + Blok D |
| Mission Highlight: | Entered lunar orbit on June 2, 1974 |
| Mission Duration: | ~521-days ~November 1, 1975 |
| Mass: | 5,700 kg |
| NSSDC ID: | 1974-037A |
| Webpage: | NASA NSSDC Master Catalog |
| Orbital elements | |
|---|---|
| Semimajor Axis: | 6,598.3 km |
| Eccentricity: | .18 |
| Inclination: | 19.35° |
| Orbital Period: | 130 minutes |
| Apogee: | 222 km |
| Perigee: | 219 km |
| Orbits: | ~3,875 |
| Instruments | |
| Imaging system : | Lunar photography |
| Gamma-ray spectrometer : | |
| Radio altimeter : | Lunar soil composition |
| Meteoroid detectors : | |
| Magnetometer : | Lunar magnetic field |
| Cosmic-ray detectors : | |
| Radiation detectors : | Lunar radiation environment |
Luna 22 (Ye-8-LS series) was an unmanned space mission, part of the Soviet Luna program, also called Lunik 22. Luna 22 was a lunar orbiter mission. The spacecraft carried imaging cameras and also had the objectives of studying the Moon's magnetic field, surface gamma ray emissions and composition of lunar surface rocks, and the gravitational field, as well as micrometeorites and cosmic rays. Luna 22 was launched into Earth parking orbit and then to the moon. It was inserted into a circular lunar orbit on 2 June 1974. The spacecraft made many orbit adjustments over its 18 month lifetime in order to optimize the operation of various experiments, lowering the perilune to as little as 25 km. Maneuvering fuel was exhausted on 2 September and the mission was ended in early November.
Luna 22 was the second of two “advanced” lunar orbiters (the first being Luna 19) designed to conduct extensive scientific surveys from orbit. Launched about a year after the termination of Lunokhod 2 operations on the lunar surface, Luna 20 performed a single midcourse correction en route the Moon on 30 May before entering lunar orbit on 2 June 1974. Initial orbital parameters were 219 x 222 kilometers at 19°35' inclination. In addition to its primary mission of surface photography, Luna 22 also performed investigations to determine the chemical composition of the lunar surface, recorded meteoroid activity, searched for a lunar magnetic field, measured solar and cosmic radiation flux, and continued studies of the irregular magnetic field. Through various orbital changes, Luna 22 performed without any problems and continued to return photos fifteen months into the mission, although its primary mission had ended by 2 April 1975. The spacecraft’s maneuvering propellant was finally depleted on 2 September, and the highly successful mission was formally terminated in early November 1975. Luna 22 remains the final Soviet or Russian lunar orbiter.
- Launch Date/Time: 1974-05-29 at 08:57:00 UTC
- On-orbit dry mass: 4000 kg
| Preceded by: Luna 21 |
Luna programme | Succeeded by: Luna 23 |
| Luna programme |
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| Luna 1958A | Luna 1958B | Luna 1958C | Luna 1 | Luna 1959A | Luna 2 | Luna 3 | Luna 1960A | Luna 1960B | Sputnik 25 | Luna 1963B | Luna 4 | Luna 1964A | Luna 1964B | Cosmos 60 | Luna 1965A | Luna 5 | Luna 6 | Luna 7 | Luna 8 | Luna 9 | Cosmos 111 | Luna 10 | Luna 1966A | Luna 11 | Luna 12 | Luna 13 | Luna 1968A | Luna 14 | Luna 1969A | Luna 1969B | Luna 1969C | Luna 15 | Cosmos 300 | Cosmos 305 | Luna 1970A | Luna 1970B | Luna 16 | Luna 17 | Luna 18 | Luna 19 | Luna 20 | Luna 21 | Luna 22 | Luna 23 | Luna 1975A | Luna 24 | ||||
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