Table information for 'gdr2mock.astrometric_performance2'

General

Table Description: This table gives numerical factors to be applied to the sky-averaged astrometric errors for the different astrometric parameters as function of ecliptic latitude β, including the effect of the variation of the number of transits over the sky. Source: https://www.cosmos.esa.int/web/gaia/table-2

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Resource Description: This catalogue is a simulation of the Gaia DR2 stellar content using Galaxia (a tool to sample stars from a Besancon-like Milky Way model), 3d dust extinction maps and the latest PARSEC Isochrones. It is mimicking the Gaia DR2 data model and an apparent magnitude limit of g=20,7. Extinctions and photometry in different bands have also been included in a supplementary table as well as uncertainty estimates using a scaled nominal error model.

For a list of all services and tables belonging to this table's resource, see Information on resource 'A Gaia DR2 mock stellar catalog'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2018PASP..130g4101R (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:gdr2mock_astrometric_performance2,
  year=2018,
  title={Gaia Astrometric Performance, Table 2},
  author={Rybizki, J. and Demleitner, M. and Fouesneau, M. and Bailer-Jones, C. and Rix, H.-W. and Andrae, R.},
  url={http://dc.zah.uni-heidelberg.de/tableinfo/gdr2mock.astrometric_performance2},
  howpublished={{VO} resource provided by the {GAVO} Data Center},
  doi = {10.21938/SYx.JVejuu66uzDiLcfRlA}
}

Fields

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
lat_index Index Bin index, starting at 0 N/A meta.id;meta.main
n_obs N_obs The sky averaged number of observations at eom for a specific bin in ecliptic latitude N/A meta.number;obs
alpha_ratio ra error factor The error factor to be multiplied with the nominal parallax error to derive ra error for a specific ecliptic latitude bin N/A arith.ratio
delta_ratio dec error factor The error factor to be multiplied with the nominal parallax error to derive dec error for a specific ecliptic latitude bin N/A arith.ratio
parallax_ratio parallax error factor The error factor to be multiplied with the nominal parallax error to derive parallax error for a specific ecliptic latitude bin N/A arith.ratio
pmra_ratio pmra error factor The error factor to be multiplied with the nominal parallax error to derive pmra error for a specific ecliptic latitude bin N/A arith.ratio
pmdec_ratio pmdec error factor The error factor to be multiplied with the nominal parallax error to derive pmdec error for a specific ecliptic latitude bin N/A arith.ratio

Columns that are parts of indices are marked like this.

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