Table information for 'ppmx.data'

General

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Resource Description: PPM-Extended (PPMX) is a catalogue of 18 088 919 stars on the ICRS system containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system.

For a list of all services and tables belonging to this table's resource, see Information on resource 'The PPM-Extended (PPMX) catalogue of positions and proper motions'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2008A&A...488..401R (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:ppmx_data,
  year=2007,
  title={The {PPM}-Extended ({PPMX}) catalogue of positions and proper motions},
  author={Röser, S. and Schilbach, E. and Schwan, H. and Kharchenko, N.V. and Piskunov, A. and Scholz, R.},
  url={https://dc.zah.uni-heidelberg.de/tableinfo/ppmx.data},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Resource Documentation

PPM-Extended (PPMX) is a catalogue of 18 088 919 stars on the ICRS system containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system. PPMX consists of three parts:

  1. a survey complete down to RU = 12.8 in the magnitude system of UCAC2;
  2. additional stars of high-precision proper motions, and
  3. all other stars from GSC 1.2 identified in 2MASS.

The typical accuracy of the proper motions is 2 mas/y for 66 percent of the survey stars (1) and the high-precision stars (2), and about 10 mas/y for all other stars. PPMX contains photometric information from ASCC-2.5 and 2MASS.

We performed 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.

Columns

Sorted alphabetically. [Sort by DB column index]

NameTable Head DescriptionUnitUCD
alphaFloat RA Main value of right ascension deg pos.eq.ra;meta.main
angle_pm PA of PM Position angle of total proper motion deg pos.posAng;pos.pm
Bmag m_B B magnitude in Johnson system mag phot.mag;em.opt.B
c_x c_x x coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.x
c_y c_y y coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.y
c_z c_z z coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.z
Cmag Cat. mag. Catalogue magnitude from source mag phot.mag
DecErr Err. delta Mean error in DE at epDE mas stat.error;pos.eq.dec
deltaFloat Dec Main value of declination deg pos.eq.dec;meta.main
e_Bmag Err(m_B) Standard error on B magnitude mag stat.error;phot.mag;em.opt.B
e_Hmag Err(m_H) Standard error on H magnitude mag stat.error;phot.mag;em.IR.H
e_Jmag Err(m_J) Standard error on J magnitude mag stat.error;phot.mag;em.IR.J
e_Kmag Err(m_K) Standard error on K magnitude mag stat.error;phot.mag;em.IR.K
e_Vmag Err(m_V) Standard error on V magnitude mag stat.error;phot.mag;em.opt.V
epDE Mean Ep. DE Mean Epoch (Dec) yr time.epoch;pos.eq.dec
epRA Mean Ep. RA Mean Epoch (RA) yr time.epoch;pos.eq.ra
Hmag m_H H magnitude in Johnson system mag phot.mag;em.IR.H
Jmag m_J J magnitude in Johnson system mag phot.mag;em.IR.J
Kmag m_K K magnitude in Johnson system mag phot.mag;em.IR.K
localid Identifier Name (IAU convention HHMMSS.s+DDMMSS), p or f appended to desambiguate N/A meta.id;meta.main
n_obs #obs in fit number of observations in LSQ fit N/A meta.number;obs
p_flag LSQ fit bad? True if LSQ fit is bad N/A meta.code.qual
pm_total PM Total proper motion arcsec/yr pos.pm
pmDE PM (delta) Proper Motion in Dec arcsec/yr pos.pm;pos.eq.dec
PMDEErr Err. PM (delta) Mean error in pmDE arcsec/yr stat.error;pos.pm;pos.eq.ra
pmRA PM (alpha) Proper Motion in RA*cos(delta) arcsec/yr pos.pm;pos.eq.ra
PMRAErr Err. PM (alpha) Mean error in pmRA*cos(DEmas) arcsec/yr stat.error;pos.pm;pos.eq.ra
RAErr Err. alpha Mean error in RA*cos(DEmas) at epRA mas stat.error;pos.eq.ra
Rmag m_R calculated Ru magnitude from source mag phot.mag;em.opt.R
srccat Source catalogue Source catalogue N/A meta.ref
srcId Id in source Star identifier in the source catalogue N/A meta.id.cross
sub_flag Subset flag Subset flag N/A meta.code
Vmag m_V V magnitude in Johnson system mag phot.mag;em.opt.V

Columns that are parts of indices are marked like this.

Other

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