J/A+A/312/1031ivo://CDS.VizieR/J/A+A/312/1031doi:10.26093/cds/vizier.33121031CDSArgyle R.W.Einicke O.H.Pilkington J.D.H.Morrison L.V.,Fabricius C.Helmer L.1998-02-18T06:32:36Z1998-02-18T07:32:30ZCDS support team

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

cds-question@unistra.frnebulaeastrometryThe optical positions of 63 extragalactic nebulae measured in the frame defined by the annual series of Carlsberg Meridian Catalogues Nos 1-8 are compared with their VLBI radio positions in the International Celestial Reference Frame. The differences between these radio and optical positions are interpreted as showing the global distortion of the Carlsberg optical frame, which is linked to that of the FK5. North of the equator the Carlsberg optical frame is within 0.05" of the ICRF; but south of the equator it deviates by 0.07" in right ascension and 0.10" in declination. The general form of the deviations follow those of the FK5, which are revealed in a recent comparison of FK5 with a preliminary version of the Hipparcos catalogue (H30).1996A&A...312.1031Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/312/1031CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/213 : CMC8 (8th Carlsberg Meridian Catalog, 1994)I/205 : CMC7 (7th Carlsberg Meridian Catalogue, 1993)I/189 : CMC6 (6th Carlsberg Meridian Catalogue, 1992)I/170 : CMC5 (5th Carlsberg Meridian Catalogue, 1991)I/147 : CMC4 (4th Carlsberg Meridian Catalogue, 1989)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/312/1031https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/312/1031http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/312/1031https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/312/1031https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/312/1031http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/312/1031GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/312/1031/table2 (Carlsberg optical positions of ICRF sources and differences, radio minus optical)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/312/1031/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/312/1031/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/312/1031/table2?GETtext/xml+votable180.050000true1.557875-6.3931750.005555555555555556Cone search capability for table J/A+A/312/1031/table3 (Carlsberg optical positions and proper motions of radio stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/312/1031/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/312/1031/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/312/1031/table3?GETtext/xml+votable180.050000true40.1319416761.229330560.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/312/1031?format=asciiOpticaldefaultJ/A+A/312/1031/table2Carlsberg optical positions of ICRF sources and differences, radio minus opticalNplate? Number of platesmeta.numberintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of radio source (IAU nomenclature)meta.id;meta.maincharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination signpos.eq.dec;meta.mainDRADelta RA (radio-optical)arcsecpos.eq.ra;arith.difffloatDDEDelta DE (radio-optical)arcsecpos.eq.dec;arith.difffloatJ/A+A/312/1031/table3Carlsberg optical positions and proper motions of radio starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of radio starmeta.id;meta.maincharRA2000Right ascension (2000)pos.eq.ra;meta.mainpmRAProper motion in right ascensions/yrpos.pm;pos.eq.rafloatEpRA-1900Epoch of RA (1900+)yrtime.epochfloatDE2000Declination signpos.eq.dec;meta.mainpmDEProper motion in declinationarcsec/yrpos.pm;pos.eq.decfloatEpDE-1900Epoch of DE (1900+)yrtime.epochfloatDRADelta RA(radio-optical)arcsecpos.eq.ra;arith.difffloatDDEDelta Dec(radio-optical)arcsecpos.eq.dec;arith.difffloat