I/175ivo://CDS.VizieR/I/175CDSFricke W.Schwan H.CorbinT. (in collaboration with Bastian U.,Bien R.Cole C.Jackson R.Jaehrling R.Jahreiss H.Lederle T.,RoeserS.)1998-03-05T21:00:27Z1998-03-05T22:00:22ZCDS support team

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

cds-question@unistra.frThe FK5 Extension provides improved mean positions and proper motions for the 3117 new fundamental stars. The machine version of the catalog contains the positions and proper motions of the Extension stars for the epochs and equinoxes J2000.0 and B1950.0, the mean epochs of individual observed right ascensions and declinations used to determine the final positions, the mean errors of the final positions and proper motions for the reported epochs, and ancillary data such as magnitudes, spectral types, parallaxes, and radial velocities. Cross identifications to the numbering systems of the AGK3R, SRS, HD, DM, and GC catalogs are also included. Introduction: The Fifth Fundamental Catalogue (FK5) Part II (which may be referred to by the alternate name FK5 Extension) provides mean positions and proper motions at equinox and epoch J2000.0 for 3117 new fundamental stars. The purpose of the FK5, Part II, is mainly to extend the fundamental system defined by the FK5, Part I (the so-called Basic FK5; Fricke et al. 1988) to about magnitude 9.5. The positions and proper motions given in the FK5 Extension are in accordance with the IAU (1976) system of astronomical constants; this means that the proper motions are based on the new values for the precessional quantities, the terms of elliptic aberration are eliminated from the mean positions, the correction for the error in the FK4 equinox and its fictitious motion are applied, and the systematic corrections FK5-FK4, as given in the Basic FK5 (page 86), have been taken into account. More than 200 catalogs providing star positions obtained from throughout the world have been used in the compilation of the FK5 Extension. The source reference should be consulted, along with the FK5 Basic catalog (Fricke et al. 1988) for more detailed information regarding the motivation for construction of the FK5, the determination of its equator and equinox, the expressions for general precession, a discussion of the FK5 system, systematic differences between the FK4 and FK5, the transformation of observational catalogs to the FK5 system and to the reference system J2000.0, and more thorough descriptions of the data contained in the FK5 catalog. In fact, the source reference should be consulted by all users before utilizing the FK5 data for astrometric applications. The trigonometric parallax and radial velocity fields are blank when data are missing, and because parallax and radial velocity can validly be zero, the fields should be checked for blanks before the data are used. The user should note that the file is ordered by FK5 number, which means that the stars are arranged neither by right ascension nor by declination.1991VeARI..33....1Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/I/175CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/149 : Part I: Basic Fundamental Starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=I/175https://vizier.iucaa.in/viz-bin/VizieR-2?-source=I/175http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=I/175https://vizier.cds.unistra.fr/viz-bin/votable?-source=I/175https://vizier.iucaa.in/viz-bin/votable?-source=I/175http://vizieridia.saao.ac.za/viz-bin/votable?-source=I/175GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table I/175/fk5e (FK5 Extension - Part II)https://vizier.cds.unistra.fr/viz-bin/conesearch/I/175/fk5e?https://vizier.iucaa.in/viz-bin/conesearch/I/175/fk5e?http://vizieridia.saao.ac.za/viz-bin/conesearch/I/175/fk5e?GETtext/xml+votable180.050000true1.25497527.6747250.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/I/175?format=asciiOpticaldefaultI/175/fk5eFK5 Extension - Part IIAGK3R*AGK3R (catalog <I/161>) numbermeta.idcharRV?Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullableSRSSRS (catalog <I/138>) numbermeta.idcharHDHD (catalog <III/135>) numbermeta.idcharDM*DM identificationmeta.idcharGCGC (catalog <I/113>) numbermeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFK5*FK5 Extension numbermeta.id;meta.mainintRAJ2000*Right ascension J2000.0 (hours) Equinox=J2000, Epoch=J2000pos.eq.ra;meta.mainpmRA*Centennial proper motion J2000.0s/hapos.pm;pos.eq.rafloatDEJ2000*Declination, J2000.0 (sign)pos.eq.dec;meta.mainpmDE*Centennial proper motion J2000.0arcsec/hapos.pm;pos.eq.decfloatRA1950Right ascension B1950.0 (hours) in new system, Equinox=B1950, Epoch=B1950pos.eq.rapmRA1950Centennial proper motion B1950.0s/hapos.pm;pos.eq.rafloatDE1950Declination B1950.0 (sign)pos.eq.decpmDE1950Centennial proper motion B1950.0arcsec/hapos.pm;pos.eq.decfloatEpRA*Epoch (RA)atime.epochfloate_RAs*Mean error in RAmsstat.errorfloate_pmRA*Mean error in centennial PMms/hastat.errorfloatEpDE*Epoch (Dec)atime.epochfloate_DEs*Mean error in Dec10masstat.errorfloate_pmDE*Mean error in centennial PM10mas/hastat.errorfloatVmag*V magnitudemagphot.mag;em.opt.Vfloatn_Vmag*Magnitude flagmeta.notecharSpSpectral type(s)src.spTypecharplx?Parallaxarcsecpos.parallax.trigfloatnullable