I/347ivo://CDS.VizieR/I/347CDSBailer-Jones C.A.L.Rybizki J.Fouesneau M.Mantelet G.Andrae R.2024-01-08T12:50:07Z2018-06-29T13:12:20ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysstellar-distanceFor 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.2018AJ....156...58Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/347CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/833/119 : Distances of Gaia DR1 TGAS sources (Astraatmadja+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/347https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/347http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/347https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/347https://vizier.iucaa.in/viz-bin/votable?-source=I/347http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/347GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/347/gaia2dis (Estimating distances from parallaxes (1331909727 sources))https://vizier.cds.unistra.fr/viz-bin/conesearch/I/347/gaia2dis?https://vizier.iucaa.in/viz-bin/conesearch/I/347/gaia2dis?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/347/gaia2dis?GETtext/xml+votable180.050000true44.99615368415960.00561580621070.0055555555555555566/0https://cdsarc.cds.unistra.fr/viz-bin/moc/I/347?format=asciidefaultI/347/gaia2disEstimating distances from parallaxes (1331909727 sources)SourceSource identifier, identical to the Gaia-DR2 source_id (id)meta.id;meta.mainindexedRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec)degpos.eq.dec;meta.mainrest? Estimated distance (r_est)pcpos.distance;stat.meandoublenullableb_rest? Lower bound on the confidence interval of the estimated distance (r_lo)pcpos.distance;stat.mindoublenullableB_rest? Upper bound on the confidence interval of the estimated distance (r_hi)pcpos.distance;stat.maxdoublenullablerlenLength scale used in the prior for the distance estimation (r_len)pcstat.valuedoubleResFlag[0-2] Result flag (result_flag) (1)meta.codecharModFlag[1/2] Number of modes in the posterior (modality_flag)meta.codeint