Lunokhod 2

Lunokhod 2 was the second of two successful robotic Lunokhod rovers landed on the Moon by the Soviet Union. Launched as part of the Luna programme, it significantly surpassed the achievements of its predecessor, Lunokhod 1, by traveling a much greater distance and conducting extensive scientific surveys. The rover was deployed into Le Monnier crater on the eastern edge of Mare Serenitatis, providing valuable data on the lunar surface. Its mission represented a major technological triumph for the Soviet space program during the latter stages of the Space Race.

Mission overview

The primary objective of the mission was to conduct detailed exploration of the lunar geology and surface conditions in a new region of the Moon. Launched aboard a Proton-K rocket from the Baikonur Cosmodrome, the spacecraft Luna 21 carried the rover to the Moon, successfully soft-landing on 15 January 1973. The deployment of the rover onto the surface was completed the following day, initiating a planned operational period of several months. The mission aimed to photograph the lunar terrain, analyze soil mechanics, and measure various environmental parameters like solar X-rays and cosmic rays.

Design and construction

The rover was constructed by the design bureau Lavochkin, building upon the proven engineering of Lunokhod 1. Its core was a pressurized, temperature-controlled instrument compartment mounted on an eight-wheeled chassis, providing robust mobility. For navigation, it utilized a suite of television cameras, including panoramic and stereoscopic systems, alongside gyroscopes and an odometer. Power was supplied by a hinged solar panel that charged chemical batteries, allowing operations during the lunar night. A sophisticated radioisotope heater unit maintained essential temperatures during the extreme cold.

Operational history and achievements

Operational control was conducted by a team of drivers and engineers at the Deep Space Communication Centre near Simferopol in the Crimea. The rover began traversing the rugged floor of Le Monnier crater immediately after deployment, navigating around impact craters and lunar regolith formations. During its four months of activity, it traveled approximately 42 kilometers, a record for extraterrestrial rovers that stood for decades until surpassed by missions like Opportunity. The rover transmitted over 86 panoramic images and 80,000 television pictures back to Earth, vastly improving the cartography of the region.

Scientific instruments and experiments

The rover was equipped with a sophisticated array of instruments. These included the RIFMA X-ray fluorescence spectrometer for soil composition analysis, a laser rangefinder for precise distance measurements, and an astrophotometer to study lunar horizon glow. A penetrometer, known as the PrOP, tested the physical properties of the regolith, while a magnetometer measured local magnetic fields. Additional devices detected solar wind particles and recorded levels of cosmic radiation, contributing to fundamental research in planetary science and space weather.

Legacy and current status

The mission concluded officially after the rover's interior was contaminated with lunar dust, causing overheating, with last contact on 11 May 1973. The precise location of the rover was lost for decades until identified in 2010 by the Lunar Reconnaissance Orbiter team, led by researchers at Arizona State University. This rediscovery allowed the Apache Point Observatory to successfully reflect laser pulses off its French-built corner reflector, making it an active tool for lunar laser ranging experiments. Lunokhod 2 remains a landmark achievement in robotic spacecraft engineering and a symbol of Soviet technological prowess during the Cold War.

Category:Luna programme Category:Spacecraft launched in 1973 Category:Robotic rovers