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Astrometry and Photometry of 400 Million Stars Brighter than 18 Mag

Published online by Cambridge University Press:  07 August 2017

E. Høg
E. Høg*
Affiliation:
University Observatory, østervoldgade 3, 1350 Copenhagen K, Denmark

Abstract

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A satellite mission for accurate astrometry and multi-colour photometry is discussed, similar in principle to the ESA Hipparcos mission and here called the Roemer mission. The limiting magnitude will be about V = 18 mag while 13 mag is the limit of the present Hipparcos mission. Luminosities of stars up to 2 kpc away can be obtained, corresponding to a volume 10000 times larger than with Hipparcos. A mission of 5 years will provide an accuracy of 0.1 milli-arcsec at 12th magnitude for positions and parallaxes and 0.05 milli-arcsec for annual proper motions. This is achieved by a satellite using a mosaic of CCD detectors in the focal planes of two beam-combiner telescopes of 0.29 m aperture. The instrument is described and the expected performance with an input catalog of 400 million program stars is given.

Type
Space Optical Astrometry
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 37 - 45
Copyright
Copyright © Kluwer 

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