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I/347 Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
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Estimating distances from parallaxes.
IV. Distances to 1.33 billion stars in Gaia data release 2.
Bailer-Jones C.A.L., Rybizki J., Fouesneau M., Mantelet G., Andrae R.
<Astron. J. 156, 58 (2018)>
=2018AJ....156...58B
=2018yCat.1347....0B
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ADC_Keywords: Surveys ; Stars, distances
Keywords: catalogs - Galaxy: structure - methods: statistical - stars: distances
Abstract:
For the majority of stars in the second Gaia data release, reliable
distances cannot be obtained by inverting the parallax. A correct
inference procedure must instead be used to account for the
nonlinearity of the transformation and the asymmetry of the resulting
probability distribution. Here we infer distances to almost all 1.33
billion stars with parallaxes published in the second Gaia data
release. This is done using a weak distance prior that varies smoothly
as a function of Galactic longitude and latitude according to a Galaxy
model. The irreducible uncertainty in the distance estimate is
characterized by the lower and upper bounds of an asymmetric
confidence interval. Although more precise distances can be estimated
for a subset of the stars using additional data (such as photometry),
our goal is to provide purely geometric distance estimates,
independent of assumptions about the physical properties of, or
interstellar extinction towards, individual stars. We analyze the
characteristics of the catalog and validate it using clusters.
Description:
The catalog can be queried using ADQL at
http://gaia.ari.uni-heidelberg.de/tap.html (which also hosts the Gaia
catalog) and downloaded from
http://www.mpia.de/~calj/gdr2_distances.html. Each file contains
200000 sources (except the last one) with a single header line. Total
size of all files is 114GB.