You can manage bookmarks using lists, please log in to your user account for this.
Media type:
E-Article
Title:
Astrometry and Photometry of 400 Million Stars Brighter than 18 Mag
Contributor:
Høg, E.
Published:
Cambridge University Press (CUP), 1993
Published in:
Symposium - International Astronomical Union, 156 (1993), Seite 37-45
Language:
English
DOI:
10.1017/s0074180900172900
ISSN:
0074-1809
Origination:
Footnote:
Description:
A satellite mission for accurate astrometry and multi-colour photometry is discussed, similar in principle to the ESA Hipparcos mission and here called theRoemer mission.The limiting magnitude will be aboutV= 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.