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A CCD Modulation Detector for a Second Hipparcos Mission

Published online by Cambridge University Press:  07 August 2017

E. Høg  and
L. Lindegren
E. Høg
Affiliation:
University Observatory 1350 Copenhagen K, Denmark
L. Lindegren
Affiliation:
Lund Observatory 22100 Lund, Sweden

Abstract

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A CCD modulation detector for a possible Hipparcos-2 mission is described. It is at least 1000 times more light efficient than the image dissector tube system used in the current Hipparcos mission. A beam combiner telescope with 29 cm aperture diameter could measure all 15 million stars brighter than 14th magnitude, providing accurate multi-colour photometry in addition to the astrometric parameters. Using two telescopes with different basic angles will further improve the rigidity of the resulting system of positions and proper motions. An accuracy of 0.5 milli-arcsec up to 10th magnitude is expected for a 2.5 year mission. The modulating grid is imaged on a CCD performing a ‘cophased integration’ of nine separate images of the whole field of view, each image representing a different part of the modulation period.

Type
Space Optical Astrometry
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 31 - 36
Copyright
Copyright © Kluwer 

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