Information on Service 'PPMX query'

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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 service's resource, see Information on resource 'The PPM-Extended (PPMX) catalogue of positions and proper motions'

Service 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.

Overview

You can access this service using:

This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
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
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
deltaFloat Dec Main value of declination deg pos.eq.dec;meta.main
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
localid Identifier Name (IAU convention HHMMSS.s+DDMMSS), p or f appended to desambiguate N/A meta.id;meta.main
MAXREC Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
n_obs #obs in fit number of observations in LSQ fit N/A meta.number;obs
pm_total PM Total proper motion arcsec/yr pos.pm
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
RESPONSEFORMAT Output Format File format requested for output. N/A meta.code.mime
Rmag m_R calculated Ru magnitude from source mag phot.mag;em.opt.R
SR Search Radius Search radius deg N/A
VERB Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A
Vmag m_V V magnitude in Johnson system mag phot.mag;em.opt.V

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
aladin Aladin View in Aladin N/A N/A
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
Cmag Cat. mag. Catalogue magnitude from source mag phot.mag
deltaFloat Dec Main value of declination deg pos.eq.dec;meta.main
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
pm_total PM Total proper motion arcsec/yr pos.pm
PMDEErr Err. PM (delta) Mean error in pmDE arcsec/yr stat.error;pos.pm;pos.eq.ra
PMRAErr Err. PM (alpha) Mean error in pmRA*cos(DEmas) arcsec/yr stat.error;pos.pm;pos.eq.ra

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
localid Identifier Name (IAU convention HHMMSS.s+DDMMSS), p or f appended to desambiguate N/A meta.id;meta.main 1
alphaFloat RA Main value of right ascension deg pos.eq.ra;meta.main 1
deltaFloat Dec Main value of declination deg pos.eq.dec;meta.main 1
Cmag Cat. mag. Catalogue magnitude from source mag phot.mag 9
pmRA PM (alpha) Proper Motion in RA*cos(delta) arcsec/yr pos.pm;pos.eq.ra 9
pmDE PM (delta) Proper Motion in Dec arcsec/yr pos.pm;pos.eq.dec 9
_r Dist. Distance to cone center deg pos.distance 10
epRA Mean Ep. RA Mean Epoch (RA) yr time.epoch;pos.eq.ra 11
epDE Mean Ep. DE Mean Epoch (Dec) yr time.epoch;pos.eq.dec 11
pm_total PM Total proper motion arcsec/yr pos.pm 15
angle_pm PA of PM Position angle of total proper motion deg pos.posAng;pos.pm 15
RAErr Err. alpha Mean error in RA*cos(DEmas) at epRA mas stat.error;pos.eq.ra 15
DecErr Err. delta Mean error in DE at epDE mas stat.error;pos.eq.dec 15
sub_flag Subset flag Subset flag N/A meta.code 20
srccat Source catalogue Source catalogue N/A meta.ref 20
srcId Id in source Star identifier in the source catalogue N/A meta.ref;meta.id 20
PMRAErr Err. PM (alpha) Mean error in pmRA*cos(DEmas) arcsec/yr stat.error;pos.pm;pos.eq.ra 21
PMDEErr Err. PM (delta) Mean error in pmDE arcsec/yr stat.error;pos.pm;pos.eq.ra 21
Rmag m_R calculated Ru magnitude from source mag phot.mag;em.opt.R 23
Bmag m_B B magnitude in Johnson system mag phot.mag;em.opt.B 23
Vmag m_V V magnitude in Johnson system mag phot.mag;em.opt.V 23
Jmag m_J J magnitude in Johnson system mag phot.mag;em.IR.J 23
Hmag m_H H magnitude in Johnson system mag phot.mag;em.IR.H 23
Kmag m_K K magnitude in Johnson system mag phot.mag;em.IR.K 23
n_obs #obs in fit number of observations in LSQ fit N/A meta.number;obs 25
p_flag LSQ fit bad? True if LSQ fit is bad N/A meta.code.qual 25
e_Bmag Err(m_B) Standard error on B magnitude mag stat.error;phot.mag;em.opt.B 29
e_Vmag Err(m_V) Standard error on V magnitude mag stat.error;phot.mag;em.opt.V 29
e_Jmag Err(m_J) Standard error on J magnitude mag stat.error;phot.mag;em.IR.J 29
e_Hmag Err(m_H) Standard error on H magnitude mag stat.error;phot.mag;em.IR.H 29
e_Kmag Err(m_K) Standard error on K magnitude mag stat.error;phot.mag;em.IR.K 29
c_x c_x x coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.x 30
c_y c_y y coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.y 30
c_z c_z z coordinate of intersection of radius vector and unit sphere N/A pos.cartesian.z 30

VOResource XML (that's something exclusively for VO nerds)