Query : 2008A&A...488..401R

2008A&A...488..401R - Astronomy and Astrophysics, volume 488, 401-408 (2008/9-2)

PPM-Extended (PPMX) - a catalogue of positions and proper motions.


Abstract (from CDS):

We build a catalogue PPM-Extended (PPMX) on the ICRS system which is complete down to a well-defined limiting magnitude and contains the best presently available proper motions suited for kinematic studies in the Galaxy. We perform a rigorous weighted least-squares adjustment of individual observations, spread over more than a century, to determine mean positions and proper motions. The stellar content of PPMX is taken from GSC 1.2 supplemented by catalogues like ARIHIP, PPM and Tycho-2 at the bright end. All observations have been weighted according to their individual accuracy. The catalogue has been screened towards rejecting false entries in the various source catalogues. PPM-Extended (PPMX) is a catalogue of 18088919 stars containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system. PPMX consists of three parts: a) a survey complete down to RU=12.8 in the magnitude system of UCAC2; b) additional stars of high-precision proper motions, and c) all other stars from GSC 1.2 identified in 2MASS. The typical accuracy of the proper motions is 2mas/y for 66 percent of the survey stars (a) and the high-precision stars (b), and about 10mas/y for all other stars. PPMX contains photometric information from ASCC-2.5 and 2MASS.

Abstract Copyright:

Journal keyword(s): catalogs - astrometry

VizieR on-line data: <CDS Catalogue: I/312>

Nomenclature: Catalog: PPMX JHHMMSS.s+DDMMSS N=18088919.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 0

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