Table information for 'ppmxl.main'

General

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

Resource Description:

PPMXL is a catalog of positions, proper motions, 2MASS- and optical photometry of 900 million stars and galaxies, aiming to be complete down to about V=20 full-sky. It is the result of a re-reduction of USNO-B1 together with 2MASS to the ICRS as represented by PPMX. This service additionally provides improved proper motions computed according to Vickers et al, 2016 (2016AJ....151...99V).

For a list of all services and tables belonging to this table's resource, see Information on resource 'The PPMXL Catalog'

Further information

To query this data, you can use

You can retrieve also the whole data set as a gzipped text file from http://vo.ari.uni-heidelberg.de/ppmxl (43.5 GiB). The columns in the text file are in database order as documented in the table info in DB order with columns separated by vertical bars ("|").

If you run DaCHS yourself, you can use a C booster kindly provided by Hailong Zhang. Instructions on usage are at the head of the file.

David Tholen kindly provided code to convert this into a collection of files for easy consumption by FORTRAN programs.

In 2016, John Vickers provided a global correction of the PPMXL proper motions based on extragalactic objects (2016AJ....151...99V). The results are given in the vickers_pmra and vickers_pmde columns. The coefficients we used are available at pmr-coefficients.csv and pmd-coefficients.csv. When used with the Code we actually used to compute the corrected values (adding healpix interpolation to the upstream from https://github.com/johnjvickers/PPMXL_Correction), these files have to be renamed pmr.csv and pmd.csv, respectively.

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2010AJ....139.2440R (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:ppmxl_main,
  year=2009,
  title={The {PPMXL} Catalog},
  author={Röser, S. and Demleitner, M. and Schilbach, E. and Vickers, J. J.},
  url={http://dc.zah.uni-heidelberg.de/tableinfo/ppmxl.main},
  howpublished={{VO} resource provided by the {GAVO} Data Center},
  doi = {10.21938/puTViqDkMGcQZu8LSDZ5Sg}
}

Fields

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
ipix Id Identifier (Q3C ipix of the USNO-B 1.0 object) N/A meta.id;meta.main
raj2000 RA Right Ascension J2000.0, epoch 2000.0 deg pos.eq.ra;meta.main
dej2000 Dec Declination J2000.0, epoch 2000.0 deg pos.eq.dec;meta.main
e_raepRA E_raepra Mean error in RA*cos(delta) at mean epoch deg stat.error;pos.eq.ra;meta.main
e_deepDE E_deepde Mean error in Dec at mean epoch deg stat.error;pos.eq.dec;meta.main
pmRA PM(RA) Proper Motion in RA*cos(delta) deg/yr pos.pm;pos.eq.ra
pmDE PM(Dec) Proper Motion in Dec deg/yr pos.pm;pos.eq.dec
e_pmRA Err. PM(RA) Mean error in pmRA*cos(delta) deg/yr stat.error;pos.pm;pos.eq.ra
e_pmDE Err. PM(Dec) Mean error in pmDE deg/yr stat.error;pos.pm;pos.eq.dec
nobs #obs Number of observations used [Note 4] N/A meta.number;obs
epRA Epra Mean Epoch (RA) yr time.epoch;pos.eq.ra
epDE Epde Mean Epoch (Dec) yr time.epoch;pos.eq.dec
Jmag m_J J selected default magnitude from 2MASS mag phot.mag;em.IR.J
e_Jmag Err(m_J) J total magnitude uncertainty mag stat.error;phot.mag;em.IR.J
Hmag m_H H selected default magnitude from 2MASS mag phot.mag;em.IR.H
e_Hmag Err(m_H) H total magnitude uncertainty mag stat.error;phot.mag;em.IR.H
Kmag m_K_s K_s selected default magnitude from 2MASS mag phot.mag;em.IR.K
e_Kmag Err(m_K_s) K_s total magnitude uncertainty mag stat.error;phot.mag;em.IR.K
b1mag USNO mag (B1) B mag from USNO-B, first epoch [Note 1] mag phot.mag;em.opt.B
b2mag USNO mag (B2) B mag from USNO-B, second epoch [Note 1] mag phot.mag;em.opt.B
r1mag USNO mag (R1) R mag from USNO-B, first epoch [Note 1] mag phot.mag;em.opt.R
r2mag USNO mag (R2) R mag from USNO-B, second epoch [Note 1] mag phot.mag;em.opt.R
imag USNO mag (I) I mag from USNO-B [Note 1] mag phot.mag;em.opt.I
magSurveys USNO Mag src. Surveys the USNO-B magnitudes are taken from [Note 2] N/A meta.code
flags Flags Flags [Note 3] N/A meta.code
vickers_pmra PM'(RA) Proper motion in RA as re-corrected according to 2016AJ....151...99V, cos(delta) applied. This is only available for objects with 2MASS J magnitudes. e_pmRA still is suitable as an error estimate. deg/yr pos.pm;pos.eq.ra
vickers_pmde PM'(Dec) Proper motion in Dec as re-corrected according to 2016AJ....151...99V. This is only available for objects with 2MASS J magnitudes. e_pmDE still is suitable as an error estimate. deg/yr pos.pm;pos.eq.dec

Columns that are parts of indices are marked like this.

Other

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

VOResource

VO nerds may sometimes need VOResource XML for this table.

Notes

More Information on the Base Resource

To query this data, you can use

You can retrieve also the whole data set as a gzipped text file from http://vo.ari.uni-heidelberg.de/ppmxl (43.5 GiB). The columns in the text file are in database order as documented in the table info in DB order with columns separated by vertical bars ("|").

If you run DaCHS yourself, you can use a C booster kindly provided by Hailong Zhang. Instructions on usage are at the head of the file.

David Tholen kindly provided code to convert this into a collection of files for easy consumption by FORTRAN programs.

In 2016, John Vickers provided a global correction of the PPMXL proper motions based on extragalactic objects (2016AJ....151...99V). The results are given in the vickers_pmra and vickers_pmde columns. The coefficients we used are available at pmr-coefficients.csv and pmd-coefficients.csv. When used with the Code we actually used to compute the corrected values (adding healpix interpolation to the upstream from https://github.com/johnjvickers/PPMXL_Correction), these files have to be renamed pmr.csv and pmd.csv, respectively.

Copyright and such:

To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to PPMXL. For details, see the Creative Commons CC0 1.0 Public Domain dedication. Of course, you should still give proper credit when using this data as required by good scientific practice.

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