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<ri:Resource created="1997-12-09T23:23:25Z" 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>Lynds' Catalogue of Dark Nebulae (LDN)</title><shortName>VII/7A</shortName><identifier>ivo://CDS.VizieR/VII/7A</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Lynds B.T.</name></creator><date role="Updated">2013-02-26T12:40:26Z</date><date role="Created">1997-12-09T23:23:25Z</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>nebulae</subject><description>This catalog is an updated version from the published version. The catalog was based on the red and blue prints of the National Geographic - Palomar Observatory Sky Atlas. The catalog contains positions, both equatorial and galactic for the centers of dark nebulae. Values for the cloud sizes are given in square degrees, and estimates of their opacity are given. The updated catalog is ordered by galactic longitude and includes cross references to the published catalog and Barnard Object numbers associated with the clouds.</description><source format="bibcode">1962ApJS....7....1L</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/7A</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/VII/191">VII/191 : Catalogue of Southern Dark Clouds (Hartley+ 1986)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+AS/113/325">J/A+AS/113/325 : Distance measurements of some Lynds nebulae (Hilton+ 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Opacity class</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>ID</name><description>[0/416] Identification Number.</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Seq</name><description>[1/1791] Running Number in this version of the Catalogue (ordered by GLON)</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Lynds2</name><description>Number that B. Lynds assigned when the updated catalogue was created.</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Barn</name><description>Cross-identifications with Barnard Objects. 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