J/A+AS/118/277ivo://CDS.VizieR/J/A+AS/118/277CDSGeffert M.Bonnefond P.Maintz G.Guibert J.1997-12-09T18:12:38Z1997-12-09T19:12:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fropen-star-clustersproper-motionsThe astrometric accuracy of triple image Carte du Ciel plates has been analysed using plates of the open cluster NGC 1647. A new multithreshold technique was used for the treatment of the triple image plates. Accuracies ranging from 100mas to 200mas were found. We determined proper motions with a median accuracy of 1.6mas/a for 2220 stars in the field of NGC 1647. The membership probabilities of stars in the cluster region agree very well with the data of Francic (1989). Due to a significant difference of the proper motions of SZ Tau and the cluster members, SZ Tau seems not to be a member of NGC 1647.1996A&AS..118..277Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/118/277CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/118/277https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/118/277http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/118/277https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/118/277https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/118/277http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/118/277GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/118/277/table7 (Positions and proper motions of 2220 stars in the region of NGC 1647.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/118/277/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/118/277/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/118/277/table7?GETtext/xml+votable180.050000true70.1377458319.564602780.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/118/277?format=asciiOpticaldefaultJ/A+AS/118/277/table7Positions and proper motions of 2220 stars in the region of NGC 1647.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNRInternal star numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination signpos.eq.dec;meta.mainnullablepmRAProper motion in right ascensionmas/apos.pm;pos.eq.radoublepmDEProper motion in declinationmas/apos.pm;pos.eq.decdouble