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Context. The Hundred-Thousand-Proper-Motion (HTPM) project will determine the proper motions of ~113 500 stars using a ~23-year baseline. The proper motions will be based on space-based measurements exclusively, with the Hipparcos data, with epoch 1991.25, as first epoch and with the first intermediate-release Gaia astrometry, with epoch ~2014.5, as second epoch. The expected HTPM proper-motion standard errors are 30−190 μas yr-1, depending on stellar magnitude.
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J. H. J. de Bruijne
Anna–Christina Eilers
Astronomy and Astrophysics
European Space Research and Technology Centre
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Bruijne et al. (Mon,) studied this question.
www.synapsesocial.com/papers/6a0fce5496ccf432805fc828 — DOI: https://doi.org/10.1051/0004-6361/201219219