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On the Project of a New Fourfold Coverage of the Northern Hemisphere

Published online by Cambridge University Press:  14 August 2015

Chr. de Vegt
Chr. de Vegt*
Affiliation:
Hamburger Sternwarte, F.R. Germany

Abstract

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The fully inherent information of the AGK 2 plate material, covering the northern hemisphere down to δ= −2.5° with homogeneous epoch and limiting magnitude has not been used to establish the AGK2 catalogue. A new measurement will provide positions for all stars with at least mpg=2 in the FK4 system, yielding an estimated accuracy of σ = 0″.14.

In March 1973 a newly developed zone astrograph for the yellow spectral-region has been set in operation at the Hamburg observatory which would be available about 1975 for a new fourfold coverage of the northern hemisphere. A technical description of the instrument is given. Details of the fourfold plate coverage and the observing program are discussed. As a suitable reference star system the AGK3R catalogue, updated with recently derived proper motions to that epoch, is adopted. A final positional accuracy σ = 0″.11 of the new catalogue is expected. The available epoch difference of 45 years up to that date will then provide proper motions in the FK 4 system with an estimated accuracy of at least 0″.005/a for all stars of the northern hemisphere down to mpg=2.

Type
Session E: Proper Motions and Galactic Problems
Information
Symposium - International Astronomical Union , Volume 61: New Problems in Astrometry , 1974 , pp. 209 - 215
Copyright
Copyright © Reidel 1974 

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