<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2009-10-15T14:01:23Z" status="active" updated="2025-12-01T15:30:51Z" version="1.2" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/RegistryInterface/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/RegistryInterface.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:DataService"><title>Download Guard for the PPMXL Dump</title><identifier>ivo://org.gavo.dc/ppmxl/q/download</identifier><altIdentifier>doi:10.21938/puTViqDkMGcQZu8LSDZ5Sg</altIdentifier><curation><publisher>The GAVO DC team</publisher><creator><name>Röser, S.</name></creator><creator><name>Demleitner, M.</name></creator><creator><name>Schilbach, E.</name></creator><creator><name>Vickers, J. J.</name></creator><date role="Updated">2016-04-14T00:00:00Z</date><date role="Updated">2011-06-08</date><date role="Updated">2016-04-20</date><date role="Updated">2017-12-15</date><contact><name>GAVO Data Centre Team</name><address>Mönchhofstrasse 12-14, D-69120 Heidelberg</address><email>gavo@ari.uni-heidelberg.de</email><telephone>+49 6221 54 1837</telephone></contact></curation><content><subject>stars</subject><subject>surveys</subject><subject>astrometry</subject><subject>proper-motions</subject><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
(:bibcode:`2016AJ....151...99V`).</description><source format="bibcode">2010AJ....139.2440R</source><referenceURL>https://dc.g-vo.org/ppmxl/q/download/info</referenceURL></content><rights rightsURI="https://spdx.org/licenses/CC0-1.0.html">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 &lt;http://creativecommons.org/publicdomain/zero/1.0/&gt;`_.  Of course, you should still give proper credit when using this data as required by good scientific practice.

.. image:: /static/img/cc0.png
   :alt: [CC0]

</rights><coverage><spatial>0/0-11</spatial><spectral>8.332e-20 5.369e-19</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">https://dc.g-vo.org/ppmxl/q/download/coverage</footprint></coverage></ri:Resource>