Accession Number : AD0292741

Title :   RESEARCH STUDY AND DEVELOPMENT OF 1 METRE-MIRROR FOR MOON TRACKING AND PHOTOGRAPHY

Corporate Author : MANCHESTER UNIV (ENGLAND)

Personal Author(s) : KOPAL,ZDENEK

Report Date : MAR 1962

Pagination or Media Count : 1

Abstract : The optical equipment for the 43-inch telescope was delivered and installed at the Observatoire du Pic-du-Midi in November 1961. Extensive optical tests on the 43-inch mirror revealed the optical surface to be correct within ! lambda/20 over 90% of its effective arc; slightly larger deviations were encountered only within the last 7-cm of its free aperture. The first photographs of the Moon, secured with the aid of this mirror in a f/15 Cassegrain combination are of excellent quality and augur well for the future. The Secasi oscillator to control the drive of the 43-inch telescope was delivered and functions to specifications. The infra-red pyrometer for measurements of the lunar and planetary temperatures was designed and built in our laboratories t Manchester, and used during winter months for the studies of lunar temper ture distribution in the neighbourhood of certain ray craters. The results revealed the crater floors to be cooler in daytime that their surroundings by several degrees. (Author)

Descriptors :   *ASTRONOMY, *MIRRORS, *OPTICAL TRACKING, *PHOTOGRAPHY, *TELESCOPES, CRYSTAL OSCILLATORS, INFRARED RADIATION, MOON, QUARTZ, RADIOMETERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE