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**Resource Description:**

This catalogue provides distances estimates (and uncertainties therein) for 1.33 billion stars over the whole sky brighter than about G=20.7. These have been estimated using the parallaxes (and their uncertainties) from Gaia DR2. A Bayesian procedure was used involving a prior with a single parameter L(l,b), which varies smoothly with Galactic longitude and latitude according to a Galaxy model. The posterior is summarized with a point estimate (usually the mode) and a confidence interval (usually the 68% highest density interval). The estimation procedure is described in detail in the accompanying paper, which also analyses the catalogue content.

For a list of **all services and tables** belonging
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resource, see Information on resource 'Estimated distances to 1.33 billion stars in Gaia DR2'

This table has an **associated publication**. If you use data from it,
it may be appropriate to reference
2018AJ....156...58B
(ADS BibTeX entry for the publication) either
in addition to or instead of the service reference.

To cite the **table as such**, we suggest the following
BibTeX entry:

@MISC{vo:gdr2dist_main, year=2018, title={Estimated distances to 1.33 billion stars in Gaia DR2}, author={Bailer-Jones, C.A.L. and Rybizki, J. and Fouesneau, M. and Mantelet, G. and Andrae, R.}, url={https://dc.zah.uni-heidelberg.de/tableinfo/gdr2dist.main}, howpublished={{VO} resource provided by the {GAVO} Data Center} }

Sorted by DB column index. [Sort alphabetically]

Name | Table Head | Description | Unit | UCD |
---|---|---|---|---|

source_id | Source Id | Unique source identifier. Note that this *cannot* be matched against the DR1 source_id. [Note id] | N/A | meta.id;meta.main |

r_est | Dist | Estimated distance | pc | pos.distance |

r_lo | Min. Dist. | Lower bound on the 1 σ confidence interval | pc | pos.distance;stat.min |

r_hi | Max. Dist. | Upper bound on the 1 σ confidence interval | pc | pos.distance;stat.max |

r_len | Prior scale | Length scale used in the prior for the distance estimation. | pc | stat.fit.param;pos.distance |

result_flag | Res. Code | Type of result. [Note rc] | N/A | meta.code.qual |

modality_flag | #modes | Result regime flag: number of modes in the posterior (1 or 2). | N/A | meta.code |

Columns that are parts of indices are marked like this.

The following services *may* use the data contained in this
table:

VO nerds may sometimes need VOResource XML for this table.

result_flag has three possible values:

0: failed estimate (r_est, r_lo, r_hi are all NaN) 1: _est is the mode (highest if the posterior is bimodal); r_lo/r_hi define the lower/upper limits of the highest density interval (HDI) containing 68% of the posterior probability 2: r_est is the median; r_lo/r_hi define the lower/upper limits of the equal-tailed interval (ETI), containing 68% of the posterior probability."

99.9% of the rows have result_code=1.