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UrHip PROPER MOTION CATALOG
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DOI：10.1088/0004-6256/150/5/141.png)
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摘要
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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 (similar to 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 similar to 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.
Keyword:
astrometry
binaries: general
catalogs
proper motions
期刊
IF:
5.1
论文数:
1.4W
被引数:
5.0W
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