UrHip PROPER MOTION CATALOG

ABSTRACT Proper motions are computed and collected in a catalog using the Hipparcos positions (epoch 1991.25) and URAT1 positions (epoch 2012.3-2014.6). The goal is to obtain a significant improvement on the proper motion accuracy of single stars in the northern hemisphere, and to identify new astro...

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Bibliographic Details
Published in:The Astronomical journal 2015-11, Vol.150 (5), p.141
Main Authors: Frouard, J., Dorland, B. N., Makarov, V. V., Zacharias, N., Finch, C. T.
Format: Article
Language:English
Subjects:
astrometry
binaries: general
proper motions
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Summary:ABSTRACT Proper motions are computed and collected in a catalog using the Hipparcos positions (epoch 1991.25) and URAT1 positions (epoch 2012.3-2014.6). The goal is to obtain a significant improvement on the proper motion accuracy of single stars in the northern hemisphere, and to identify new astrometric binaries perturbed by orbital motion. For binaries and multiple systems, the longer baseline of Tycho2 (∼100 years) makes it more reliable despite its larger formal uncertainties. The resulting proper motions obtained for 67,340 stars have a consequent gain in accuracy by a factor of ∼3 compared to Hipparcos. Comparison between UrHip and Hipparcos shows that they are reasonably close, but also reveals stars with large discrepant proper motions, a fraction of which are potential binary candidates.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/150/5/141