J/AJ/138/845ivo://CDS.VizieR/J/AJ/138/845doi:10.26093/cds/vizier.51380845CDSOjha R.Zacharias N.Hennessy G.S.Gaume R.A.Johnston K.J.2017-10-13T15:42:01Z2012-02-22T13:25:26ZCDS support team

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

cds-question@unistra.frquasarsinfrared-photometryvisible-astronomybroad-band-photometryccd-photometryPhotometric observations of 235 extragalactic objects that are potential targets for the Space Interferometry Mission (SIM) are presented. Mean B, V, R, I magnitudes at the 5% level are obtained at 1-4 epochs between 2005 and 2007 using the 1m telescopes at Cerro Tololo Inter-American Observatory and the Naval Observatory Flagstaff Station. Of the 134 sources that have V magnitudes in the Veron & Veron-Cetty catalog (Cat. VII/248), a difference of over 1.0mag is found for the observed-catalog magnitudes for about 36% of the common sources, and 10 sources show over 3mag difference. Our first set of observations presented here form the basis of a long-term photometric variability study of the selected reference frame sources to assist in mission target selection and to support QSO multicolor photometric variability studies in general.2009AJ....138..845Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/138/845CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/138/845https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/138/845http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/138/845https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/138/845https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/138/845http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/138/845GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/138/845/table2 (Magnitudes of Space Interferometry Mission (SIM) candidate quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/138/845/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/138/845/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/138/845/table2?GETtext/xml+votable180.050000true0.10167-12.763330.0055555555555555566/579 1509 1694 2261 2413 2456 2663 2733 2755 3233 3309 4027 4262 4695 4696 4820 4964 5180 5264 5355 5400 5466 5731 5821 5964 6192 6206 6264 6322 6368 6379 6404 6452 6515 6535 6723 7309 7618 7725 7814 7815 7859 7920 8051 8071 8466 8514 8529 8812 8845 8927 8939 8952 9194 9258 9490 9705 10039 10217 10318 10408 10422 10578 10608 10653 10694 10793 10828 10940 10981 11021 11512 11668 11723 11829 12002 12611 12708 12752 12896 13071 13175 13353 13625 13783 13800 13905 14520 14737 14888 15267 15351 16109 16185 16640 16671 16696 16758 16841 16878 17203 17360 17465 17866 18524 18769 19433 19489 19519 19651 19746 20144 20315 20908 20929 21130 21358 21497 21749 21750 21924 21935 21955 22531 22659 22979 24349 25127 25190 25373 25509 25742 26115 26131 26245 26249 26254 26270 26293 26303 26509 26650 26825 27580 27828 27862 27909 28148 28216 28278 28356 28479 28487 28534 29016 29218 29398 29795 30388 30507 30542 31680 31857 31894 32035 32159 32210 32247 32594 33285 33412 33620 33796 33817 33930 34050 34058 34065 34107 34306 34362 34415 34652 34669 34672 34770 34881 35159 35164 35180 35205 35417 35567 35691 35741 35836 35906 35932 36261 36355 36443 37102 37217 37650 38189 38477 38579 38791 38916 39479 39904 40131 40547 40762 40838 41275 43417 43787 44043 44069 44559 44605 44924 45367 45469 45525 45564 46142 46157 46299 46646 46778 47106 485612.367228618189496e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/138/845?format=asciiOpticalInfrareddefaultJ/AJ/138/845/table2Magnitudes of Space Interferometry Mission (SIM) candidate quasarsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_NameSimbad column added by the CDSmeta.notecharNameSource J2000.0 name (HHMM+DDd)meta.id;meta.mainchar<Bmag>? Mean B band magnitudemagphot.mag;em.opt.Bfloatnullablee_<Bmag>? Standard deviation in <Bmag>magstat.error;phot.mag;em.opt.Bfloatnullableo_<Bmag>Number of observations in <Bmag>meta.numberint<Vmag>? Mean V band magnitudemagphot.mag;em.opt.Vfloatnullablee_<Vmag>? Standard deviation in <Vmag>magstat.error;phot.mag;em.opt.Vfloatnullableo_<Vmag>Number of observations in <Vmag>meta.numberint<Rmag>? Mean R band magnitudemagphot.mag;em.opt.RfloatnullableEpochEpoch label (1)meta.id;time.epochchare_<Rmag>? Standard deviation in <Rmag>magstat.error;phot.mag;em.opt.Rfloatnullableo_<Rmag>Number of observations in <Rmag>meta.numberint<Imag>? Mean I band magnitudemagphot.mag;em.opt.Ifloatnullablee_<Imag>? Standard deviation in <Imag>magstat.error;phot.mag;em.opt.Ifloatnullableo_<Imag>Number of observations in <Imag>meta.numberintB-V? The (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? The (V-R) color indexmagphot.color;em.opt.V;em.opt.RfloatnullableR-I? The (R-I) color indexmagphot.color;em.opt.R;em.opt.IfloatnullableV-I? The (V-I) color indexmagphot.color;em.opt.V;em.opt.Ifloatnullable_RASimbad column added by the CDSdegpos.eq.ra;meta.mainnullable_DESimbad column added by the CDSdegpos.eq.dec;meta.mainnullable