| Risultati della ricerca nelle immagini - "LeMonnier" |
Luna21-Horz01.jpgThe first picture of the Moon, from Luna-21: LeMonnier Crater117 visiteScientific instruments included a soil mechanics tester, solar X-ray experiment, an astrophotometer to measure visible and UV light levels, a magnetometer deployed in front of the Rover on the end of a 2,5 mt boom, a radiometer, a photodetector (Rubin-1) for laser detection experiments, and a French-supplied laser corner-reflector. The Lander and Rover together weighed 1814 Kg.
Mission Profile
The SL-12/D-1-e launcher put the spacecraft into Earth parking orbit followed by Translunar Injection. On 12 January 1973, Luna 21 was braked into a 90x100 Km orbit around the Moon. On 13 and 14 January, the perilune was lowered to 16 Km altitude. On 15 January, after 40 orbits, the braking rocket was fired at 16 Km altitude, and the craft went into free fall.
At an altitude of 750 mt, the main thrusters began firing, slowing the fall until a height of 22 mt was reached.
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Luna21-Horz05-1.jpgRover tracks and the far distant walls of LeMonnier Crater134 visiteAfter landing, the Lunokhod-2 took TV images of the surrounding area, then rolled down a ramp to the surface at 01:14 UT on 16 January and took pictures of the Luna 21 Lander and Landing Site. It stopped and charged batteries until 18 January, took more images of the Lander and Landing Site, and then set out over the Moon. The Rover would run during the Lunar Day, stopping occasionally to recharge its batteries via the solar panels. At night the Rover would hibernate until the next sunrise, heated by the radioactive source. Lunokhod-2 operated for about 4 months, covered 37 Km of terrain, including hilly upland areas and rilles, and sent back 86 panoramic images and over 80.000 TV pictures.
Many mechanical tests of the surface, laser ranging measurements and other experiments were completed during this time.
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Luna21-Horz10.jpgThe walls of LeMonnier Crater108 visiteOn June 4, 1973, the Soviet Authorities announced that the Program was completed, leading to speculation that the vehicle probably failed in mid-May or could not be revived after the lunar night of May-June.
The Lunokhod-2 was not left in a position such that the laser retro-reflector could be used, thus indicating that the failure may have happened suddenly.
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Luna21-Horz12-1.jpgRover tracks and the far distant walls of LeMonnier Crater108 visitenessun commento
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Luna21-Video02.jpgThe floor of LeMonnier Crater (video frames) - (2)116 visitenessun commento
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Luna21-Video03.jpgThe floor of LeMonnier Crater (video frames) - (3)86 visitenessun commento
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Luna21-Video04-1.jpgRover tracks - video frame (1)103 visitenessun commento
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Luna21-Video04-2.jpgRover tracks - video frame (2)100 visitenessun commento
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