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Distance-dependent Offsets between Parallaxes for Nearby Stars and Gaia DR1 Parallaxes

Jao, Wei-Chun and Henry, Todd J. and Riedel, Adric R. and Winters, Jennifer G. and Slatten, Kenneth J. and Gies, Douglas R. (2016) Distance-dependent Offsets between Parallaxes for Nearby Stars and Gaia DR1 Parallaxes. Astrophysical Journal Letters, 832 (1). Art. No. L18. ISSN 2041-8205.

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We use 612 single stars with previously published trigonometric parallaxes placing them within 25 pc to evaluate parallaxes released in Gaia's first data release (DR1). We find that the Gaia parallaxes are, on average, 0.24 ± 0.02 mas smaller than the weighted mean trigonometric parallax values for these stars in the solar neighborhood. We also find that the offset changes with distance out to 100 pc, in the sense that the closer the star, the larger the offset. We find no systematic trends in the parallax offsets with stellar V magnitude, V − K color, or proper motion. We do find that the offset is roughly twice as large for stars south of the ecliptic compared to those that are north.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Jao, Wei-Chun0000-0003-0193-2187
Riedel, Adric R.0000-0003-1645-8596
Winters, Jennifer G.0000-0001-6031-9513
Additional Information:© 2016. The American Astronomical Society. Received 2016 October 12; revised 2016 November 1; accepted 2016 November 2; published 2016 November 18. We thank the anonymous referee and N. Hambly for providing us with valuable comments that improved this manuscript. Work on constructing this 25 pc sample has been supported by National Science Foundation under grants AST-0507711, AST-0908402, AST-1109445, and AST-141206. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC; Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:astrometry – solar neighborhood – stars: distances
Issue or Number:1
Record Number:CaltechAUTHORS:20161117-132744421
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Official Citation:Wei-Chun Jao (饒惟君) et al 2016 ApJL 832 L18
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72132
Deposited By: George Porter
Deposited On:17 Nov 2016 21:47
Last Modified:09 Mar 2020 13:19

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