Information on Service 'Download Guard for the PPMXL Dump'

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Further access options are discussed below

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 service's resource, see Information on resource 'The PPMXL Catalog'

Service Documentation

To query this data, you can use

You can retrieve also the whole data set as a gzipped text file (43.5 GiB) from the download service. 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.

Overview

You can access this service using:

Coverage

0.520043 3.35107 eV

This resource is not (directly) published. This can mean that it was deemed too unimportant, for internal use only, or is just a helper for a published service. Equally likely, however, it is under development, abandoned in development or otherwise unfinished. Exercise some caution.

Other services provided on the underlying data include:

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
input I read the warning Type in 'yes' here to pull the data N/A N/A

Citation Info

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