Table information for 'gps1.main'

General

Table Description: GPS1 main table with some deviations from the published paper. In particular note that Gaia and Pan-STARRS1 photometry results from blind crossmatching; see d_g and d_ps1 fields for the offsets in the respective crossmatches.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description:

This catalog combines Gaia DR1, Pan-STARRS 1, SDSS and 2MASS astrometry to compute proper motions for 350 million sources across three-fourths of the sky down to a magnitude of mr≈20. Positions of galaxies from Pan-STARRS 1 are used to build a reference frame for PS1, SDSS, and 2MASS data. Gaia DR1 is adapted to that reference frame by exploiting that locally, proper motions are linear.

GPS1 has a characteristic systematic error of less than 0.3 mas/yr, and a typical precision of 1.5−2.0 mas/yr. The proper motions have been validated using galaxies, open clusters, distant giant stars and QSOs. In comparison with other published faint proper motion catalogs, GPS1's systematic error (<0.3 mas/yr) is about 10 times better than that of PPMXL and UCAC4 (>2.0 mas/yr). Similarly, its precision (~1.5 mas/yr) is an improvement by ∼ 4 times relative to PPMXL and UCAC4 (∼6.0 mas/yr). For QSOs, the precision of GPS1 is found to be worse (∼2.0−3.0 mas/yr), possibly due to their particular differential chromatic refraction (DCR).

For a list of all services and tables belonging to this table's resource, see Information on resource 'The Gaia-PS1-SDSS (GPS1) Proper Motion Catalog'

Citing this table

@MISC{vo:gps1_main,
  year=2017,
  title={The Gaia-PS1-{SDSS} ({GPS1}) Proper Motion Catalog},
  author={Tian, H.-J. and Gupta, P. and Sesar, B. and Rix, H.-W. and Liu, C. and Goldman, B. and Platais, I. and Kudritzki, R-P. and Waters, C.Z.},
  url={http://dc.g-vo.org/tableinfo/gps1.main},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Columns

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Columns that are parts of indices are marked like this.

VOResource

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Notes

• Note c

  Pan-STARRS, 2MASS, and Gaia photometry was re-added to the objects via a blind crossmatch; it does not necessarily correspond to the photometry of the objects that were used to derive the astrometry, in particular in crowded fields.

• Note p

  The positions are SeasonAVGs from Pan-STARRS1 if unvailable from Gaia DR1. The errors are NULL in these cases.