Accession Number : AD0698809

Title :   ANNUAL REPORT NUMBER 2, 1 JULY 1968-30 JUNE 1969,

Corporate Author : YERKES OBSERVATORY WILLIAMS BAY WIS

Personal Author(s) : VAN Altena,William F.

Report Date : 30 JUN 1969

Pagination or Media Count : 9

Abstract : The progress of the Yerkes Observatory astrometric program is described. The principal result is an increase in accuracy of trigonometric parallaxes of a factor of three. A photoelectric image bisector developed at Yerkes Observatory is described, which has made part of the increase in accuracy possible. Membership determination for several open clusters, presenitization of photographic plates and photometry with the Palomar Observatory Sky Survey prints are also discussed. (Author)

Descriptors :   (*ASTRONOMY, MEASUREMENT), STARS, PHOTOMETERS, PHOTOGRAPHIC EQUIPMENT, PHOTOGRAPHIC ANALYSIS

Subject Categories : Astronomy
      Celestial Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE