Hipparcos – Tycho: Photometry & Astrometry for more than 500 000 Stars
نویسندگان
چکیده
منابع مشابه
Comparing Tycho–2 Astrometry with Ucac1
The Tycho–2 Catalogue, released in February 2000, is based on the ESA Hipparcos space mission data and various ground–based catalogs for proper motions. An external comparison of the Tycho–2 astrometry is presented here using the first U.S. Naval Observatory CCD As-trograph Catalog (UCAC1). The UCAC1 data were obtained from observations performed at CTIO between February 1998 and November 1999,...
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We carried out a search for companions to B stars using the adaptive optics system of the Advanced ElectroOptical System 3.6 m telescope. We observed 70 B stars in the I band, finding 16 companions, 10 of which are newly discovered companions. For each system with a detected companion we give its measured astrometry and differential magnitude. We then put the observation in context of the syste...
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A summary of the photometric data obtained by the Hipparcos and Tycho missions is presented. The photometric signals and their reduction to magnitudes are described, as well as the passbands and their evolution. The main mission photometry provided on average 110 observations for each of the 118 000 stars observed during the mission. The accuracies for this epoch photometry range from a few mil...
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We outline the construction of an updated version of the New Luyten TwoTenths (NLTT) catalog of high proper motion stars, which will contain improved astrometry and photometry for the vast majority of the ∼ 59, 000 stars in NLTT. The bright end is constructed by matching NLTT stars to Hipparcos, Tycho2, and Starnet; the faint end by matching to USNO-A and 2MASS. In this first paper, we detail t...
متن کاملCCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue I. Presentation of the large scale project
A description is given of the activities of an international working group created with the aim of obtaining both photometric and astrometric observations of visual double and multiple stars with angular separations in the range of one to fifteen arcseconds, that formed part of the HIPPARCOS Input Catalogue. The scientific aims and realisations of this European network are given. About 50 obser...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1986
ISSN: 1539-2996
DOI: 10.1017/s1539299600007164