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<ri:Resource created="2004-06-12T22:03:09Z" 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>Positions and Proper Motions - North</title><shortName>I/146</shortName><identifier>ivo://CDS.VizieR/I/146</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Roeser S.</name></creator><creator><name>Bastian U.</name></creator><date role="Updated">2004-06-12T22:21:49Z</date><date role="Created">2004-06-12T22:03:09Z</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>proper-motions</subject><description>PPM North gives J2000 positions and proper motions of 181731 stars north of -2.5 degrees declination. Its main purpose is to provide a convenient, dense, and accurate net of astrometric reference stars that represents the new IAU (1976) coordinate system on the sky. The mean epoch is near 1931. The average mean errors of the positions and proper motions are 0.27" and 0.43"/cen. On the average six measured positions are available per star; 1064 stars do not have sufficient redundancies to resolve discrepancies. In addition to the positions and proper motions, the PPM (North) contains the BD number, the magnitude, the spectral type, the number of positions included, the mean error of each component of the position and proper motion, the weighted mean epoch in each coordinate, the numbers in the SAO, HD, and AGK3 catalogs, and various standard notes. In addition a number of individual notes are given in the introduction. See file desc.txt for complete explanations provided by the authors.</description><source format="bibcode">1988A&amp;AS...74..449R</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/I/146</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 ivo-id="ivo://CDS.VizieR/I/149">I/149 : Fifth Fundamental Catalogue (FK5)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/193">I/193 : PPM-South Catalogue</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/206">I/206 : Bright Star Supplement to PPM</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/208">I/208 : The 90000 stars Supplement to PPM</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/146</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/146</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/146</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL use="base">https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/146</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/votable?-source=I/146</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South 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49147</spatial><footprint ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/I/146?format=ascii</footprint><waveband>Optical</waveband></coverage><tableset><schema><name>default</name><table><name>I/146/ppm1</name><description>Catalogue PPM-North</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>PPM</name><description>[1/181731]+ PPM Designation</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>primary</flag><flag>indexed</flag></column><column><name>DM</name><description>Durchmusterung, BD or CD</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="9*">char</dataType></column><column><name>Mag</name><description>Magnitude, Visual if Flag5 is 'V'</description><unit>mag</unit><ucd>phot.mag;em.opt.V</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Sp</name><description>Spectral type</description><ucd>src.spType</ucd><dataType xsi:type="vs:VOTableType" arraysize="2*">char</dataType></column><column><name>RAJ2000</name><description>Right Ascension for the Equinox=J2000.0 and Epoch=J2000.0, on the system of FK5</description><ucd>pos.eq.ra;meta.main</ucd><flag>indexed</flag></column><column><name>DEJ2000</name><description>Declination for the equinox and epoch J2000.0, on the system of FK5</description><ucd>pos.eq.dec;meta.main</ucd><flag>indexed</flag></column><column><name>pmRA</name><description>Proper motion in RA, J2000</description><unit>s/yr</unit><ucd>pos.pm;pos.eq.ra</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>pmDE</name><description>Proper motion in DE, J2000</description><unit>arcsec/yr</unit><ucd>pos.pm;pos.eq.dec</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>Npos</name><description>Number of individual positions used</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_RAs</name><description>Mean error of RA</description><unit>10mas</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_DEs</name><description>Mean error of DE</description><unit>10mas</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>e_pmRA</name><description>Mean error of pmRA</description><unit>mas/yr</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_pmDE</name><description>Mean error of pmDE</description><unit>mas/yr</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>EpRA-1900</name><description>Weighted mean epoch, RA and pmRA</description><unit>yr</unit><ucd>time.epoch</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>EpDE-1900</name><description>Weighted mean epoch, DE and pmDE</description><unit>yr</unit><ucd>time.epoch</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>SAO</name><description>[1/258997]? SAO Designation</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>HD</name><description>[1/359083]? 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