Information on resource 'UCAC3 nocross'

Services defined within this resource descriptor

• Corrections between UCAC3 and PPMXL

  Differences between UCAC3 and PPMXL in positions and proper motions, on an all-sky one-degree grid. At each gridpoint we give the differences X(PPMXL)- X(UCAC3) averaged over all stars in a sqrt(2)/2-degrees environment around the gridpoint given. The corrections given here should bring UCAC3 based astrometry to the ICRS.

Tables defined within this resource descriptor

• ucac3.icrscorr – queryable through TAP and ADQL

  Corrections between UCAC3 and the ICRS as represented by PPMXL on a grid of degrees, obtained by substracting UCAC3 from PPMXL in cones of radius sqrt(2)/2 degrees around the given center position.

• ucac3.main – queryable through TAP and ADQL

  The UCAC3 all-sky CCD astrograph catalogue, minus the fields from 2MASS and SuperCosmos and matching/object flags (which can be recovered with a local crossmatch).

• ucac3.ppmxlcross – queryable through TAP and ADQL

  A crossmatch between UCAC3 and PPMXL, created solely based on positions with a window of 1.5 arcsec radius.

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