Table information for 'ppmx.data'

General

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

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'

Further information

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.

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={http://dc.zah.uni-heidelberg.de/tableinfo/ppmx.data},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Fields

Sorted by DB column index. [Sort alphabetically]

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

Columns that are parts of indices are marked like this.

Other

The following services may use the data contained in this table:

VOResource

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More Information on the Base Resource

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.