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<ri:Resource created="2015-10-07T13:11:32Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" 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/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.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:CatalogService"><title>Absolute Proper motions Outside the Plane (APOP)</title><shortName>I/331</shortName><identifier>ivo://CDS.VizieR/I/331</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Qi Z.X.</name></creator><creator><name>Yu Y.</name></creator><creator><name>Bucciasrelli B.</name></creator><creator><name>Lattanzi M.G.</name></creator><creator><name>Smart R.L.</name></creator><creator><name>Spagna A.,McLean B.J.</name></creator><creator><name>Tang Z.H.</name></creator><creator><name>Jones H.R.A.</name></creator><creator><name>Morbidelli R.</name></creator><creator><name>Nicastro L.,Vacchiato A.</name></creator><date role="Updated">2023-12-19T13:51:25Z</date><date role="Created">2015-10-07T13:11:32Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>astrometry</subject><subject>surveys</subject><subject>proper-motions</subject><description>We present a new catalog of absolute proper motions and updated positions derived from the same Space Telescope Science Institute digitized Schmidt survey plates utilized for the construction of the Guide Star Catalog II. As special attention was devoted to the absolutization process and removal of position, magnitude and color dependent systematic errors through the use of both stars and galaxies, this release is solely based on plate data outside the galactic plane, i.e. |b|&gt;=27{deg}. The resulting global zero point error is less than 0.6 mas/yr, and the precision better than 4.0mas/yr for objects brighter than R_F_=18.5, rising to 9.0mas/yr for objects with magnitude in the range 18.5&lt;R_F_&lt;20.0. The catalog covers 22,525 square degrees and lists 100,774,153 objects to the limiting magnitude of R_F_~20.8. Alignment with the International Celestial Reference System (ICRS) was made using 1288 objects common to the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths. As a result, the coordinate axes realized by our astrometric data are believed to be aligned with the extragalactic radio frame to within +/-0.2mas at the reference epoch J2000.0. This makes our compilation one of the deepest and densest ICRF-registered astrometric catalogs outside the galactic plane. Although the Gaia mission is poised to set the new standard in catalog astronomy and will in many ways supersede this catalog, the methods and procedures reported here will prove useful to remove astrometric magnitude- and color-dependent systematic errors from the next generation of ground-based surveys reaching significantly deeper than the Gaia catalog.</description><source format="bibcode">2015AJ....150..137Q</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/I/331</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource>http://gsss.stsci.edu/catalogs/gsc/gsc2/gsc2.htm : the GSC-II Home Page</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/254">I/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/271">I/271 : The Guide Star Catalog, Version 2.2 (GSC2.2) (STScI, 2001)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/305">I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/331</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/331</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/331</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL 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