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<ri:Resource created="2018-10-16T08:09:54Z" status="active" updated="2025-06-13T15:25:00Z" 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>Astrometric classification of 647 VLBI sources</title><shortName>J/A+A/618/A80</shortName><identifier>ivo://CDS.VizieR/J/A+A/618/A80</identifier><altIdentifier>doi:10.26093/cds/vizier.36180080</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Gattano C.</name></creator><creator><name>Lambert S.</name></creator><creator><name>Le Bail K.</name></creator><date role="Updated">2020-01-13T12:07:18Z</date><date role="Created">2018-10-16T08:09:54Z</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>optical-observation</subject><subject>catalogs</subject><subject>active-galactic-nuclei</subject><subject>astrometry</subject><subject>interferometry</subject><subject>redshifted</subject><subject>radio-sources</subject><description>We present the result of our Allan standard deviation based classification according to their astrometric stability. The classification is divided into three categories (stable sources, intermediate sources, unstable sources). Stability of sources is qualified by the astrometric behavior of the source. This determines in which category the source falls into. Then, stability of the source is also quantified by a stability index (two are proposed in the table). Those indexes enable to order sources in each category of the classification.</description><source format="bibcode">2018A&amp;A...618A..80G</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A80</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/323">I/323 : International Celestial Reference Frame 2, ICRF2 (Ma+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/I/345">I/345 : Gaia DR2 (Gaia Collaboration, 2018)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/614/A140">J/A+A/614/A140 : Large Quasar Astrometric Catalogue 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