|Mission type||Lunar orbiter|
|Mission duration||60 days|
|Launch mass||1582 kg|
|Dry mass||540 kg|
|Start of mission|
|Launch date||31 March 1966, 10:48:00 GMT|
|Launch site||Baikonur, Site 31/6|
|End of mission|
|Last contact||30 May 1966|
|Periselene altitude||2088 km|
|Aposelene altitude||2738 km|
|Orbital insertion||3 April 1966, 18:44 GMT|
Five gas-discharge counters
Two ion traps/charged particle trap
Piezoelectric micrometeorite detector
Low-energy x-ray photon counters
Scientific instruments included a gamma-ray spectrometer for energies between 0.3–3 MeV (50–500 pJ), a triaxial magnetometer, a meteorite detector, instruments for solar-plasma studies, and devices for measuring infrared emissions from the Moon and radiation conditions of the lunar environment. Gravitational studies were also conducted.
Luna 10 conducted extensive research in lunar orbit, gathering important data on the strength of the Moon's magnetic field, its radiation belts, and the nature of lunar rocks (which were found to be comparable to terrestrial basalt rocks), cosmic radiation, and micrometeoroid density. Perhaps its most important finding was the first evidence of mass concentrations (called "mascons") — areas of high density below the mare basins that distort lunar orbital trajectories. Their discovery has usually been credited to the American Lunar Orbiter series.
The Luna 10 spacecraft was launched towards the Moon from an Earth-orbiting platform on 31 March 1966. The spacecraft entered lunar orbit on 3 April 1966 and completed its first orbit 3 hours later (on 4 April Moscow time). After a midcourse correction on 1 April, Luna 10, the second of two hastily prepared Soviet Ye-6S probes (that is, the backup), successfully entered lunar orbit two days later at 18:44 GMT. A 245-kilogram instrument compartment separated from the main bus, which was in a 350 x 1,000-kilometer orbit inclined at 71.9° to the lunar equator.
Luna 10 was battery powered and operated for 460 lunar orbits and 219 active data transmissions before radio signals were discontinued on 30 May 1966.
The spacecraft carried a set of solid-state oscillators that had been programmed to reproduce the notes of "The Internationale", so that it could be broadcast live to the 23rd Congress of the Communist Party of the Soviet Union. During a rehearsal on the night of 3 April, the playback went well, but the following morning, controllers discovered a missing note and played the previous night's tape to the assembled gathering at the Congress — claiming it was a live broadcast from the Moon.
|Luna programme||Succeeded by|