J/AJ/122/2055ivo://CDS.VizieR/J/AJ/122/2055doi:10.26093/cds/vizier.51222055CDSGonzalez-Perez J.N.Kidger M.R.Martin-Luis F.2023-04-06T16:50:44Z2006-09-24T12:15:39ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryWe present a total of 12,436 photometric measures of 371 field stars of 26 quasars in the visible (UBVRI) and 22,276 photometric measures of 122 field stars of 13 quasars in the near-infrared (JHK), giving a total of 34,712 measures. Of these, 115 stars in 12 fields are calibrated in both ranges. One further field, Mrk 421, was calibrated, but on close examination all sources were found to be probably nonstellar; thus these results are not included here. The stars observed cover the range from V=11 to V=20 and from K=9 to K=17 and are well distributed around the sky north of declination -30{deg}. This represents the initial sample of an extensive catalog of calibrated fields that will cover the northern sky down to declination -30{deg} and that will cover a wide range of Galactic latitudes. These fields will be useful both for photometry of AGNs in the range from B to K and also as faint calibration standards for large telescopes. The median absolute total error on the photometry, including all known error sources, ranges from 0.008mag in J to 0.034mag in B. These errors will be greatly reduced with the addition of further data in the future, although the final precision is fundamentally limited by the photometric errors in the existing lists of calibration stars used to calibrate these data.2001AJ....122.2055Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/122/2055CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/118 : UBVRI standards around Celestial Equator (Landolt 1983)II/183 : UBVRI Photometric Standards (Landolt 1992)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/122/2055https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/122/2055http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/122/2055https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/122/2055https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/122/2055http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/122/2055GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/122/2055/table1 (*Objects observed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/2055/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/2055/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/2055/table1?GETtext/xml+votable180.050000true2.62916710.9747220.005555555555555556Cone search capability for table J/AJ/122/2055/table8 (UBVRI comparison stars in the fields of AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/2055/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/2055/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/2055/table8?GETtext/xml+votable180.050000true2.671666710.92938890.005555555555555556Cone search capability for table J/AJ/122/2055/table9 (JHK comparison stars in the fields of AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/2055/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/2055/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/2055/table9?GETtext/xml+votable180.050000true35.606666743.00866670.0055555555555555566/579 582 2414 4695 5423 6253 6264 7001 7004 7896 9612-9613 9632-9633 10217 11829 12025 12380 13927 17866-17867 19566-19567 19728 19730 20099 22659 24081 24084 26131 26292 27581 28479 42901 44245 44247 44908https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/122/2055?format=asciiOpticalInfrareddefaultJ/AJ/122/2055/table1*Objects observedQSOQSO namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainz? Redshiftsrc.redshiftfloatnullableTypeType of object (1)src.classcharBandsBands in which the object has been observed for this paperinstr.bandpasscharPhotPhotometry of stars in this fieldmeta.ref.urlcharSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharJ/AJ/122/2055/table2Nights used to calibrate in the optical and infrared bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epochnullableTelTelescope used for observations (G1)instr.setupcharBandInfrared (IR) or visual (Vis) photometryinstr.bandpasscharJ/AJ/122/2055/bandsDetails of the filter set usedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope or reference code (G1)meta.note;instr.tel;meta.maincharprimaryBandBandinstr.bandpasscharlambdaCentral lambda0.1nminstr.filter;em.wl.centralintBandwith? Bandwith0.1nminstr.bandwidthintnullableJ/AJ/122/2055/table8UBVRI comparison stars in the fields of AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[GKM2001]Stellar designation (including field name)meta.id;meta.maincharRAJ2000The USNO A2.0 Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000The USNO A2.0 Declination (J2000)pos.eq.dec;meta.mainUmag? The mean U band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? The error on the mean in Umagmagstat.error;phot.mag;em.opt.Ufloatnullablen_Umag? Number of measures used in Umagmeta.numberintnullableo_Umag? Number of night on which Umag were takenmeta.numberintnullableBmag? The mean B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? The error on the mean in Bmagmagstat.error;phot.mag;em.opt.Bfloatnullablen_Bmag? Number of measures used in Bmagmeta.numberintnullableo_Bmag? Number of night on which Bmag were takenmeta.numberintnullableVmag? The mean V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? The error on the mean in Vmagmagstat.error;phot.mag;em.opt.Vfloatnullablen_Vmag? Number of measures used in Vmagmeta.numberintnullableo_Vmag? Number of night on which Vmag were takenmeta.numberintnullableRmag? The mean R band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? The error on the mean in Rmagmagstat.error;phot.mag;em.opt.Rfloatnullablen_Rmag? Number of measures used in Rmagmeta.numberintnullableo_Rmag? Number of night on which Rmag were takenmeta.numberintnullableImag? The mean I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? The error on the mean in Imagmagstat.error;phot.mag;em.opt.Ifloatnullablen_Imag? Number of measures used in Imagmeta.noteintnullableo_Imag? Number of night on which Imag were takenmeta.numberintnullableUSNO-A2details of corresponding source in Cat. USNO-A2 (I/252)meta.ref.urlcharJ/AJ/122/2055/table9JHK comparison stars in the fields of AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[GKM2001]Stellar designation (including field name)meta.id;meta.maincharRAJ2000The USNO A2.0 Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000The USNO A2.0 Declination (J2000)pos.eq.dec;meta.mainJmag? The mean J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? The error on the mean in Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablen_Jmag? Number of measures used in Jmagmeta.numberintnullableo_Jmag? Number of night on which Jmag were takenmeta.numberintnullableHmag? The mean H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? The error on the mean in Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablen_Hmag? Number of measures used in Hmagmeta.numberintnullableo_Hmag? Number of night on which Hmag were takenmeta.numberintnullableKmag? The mean K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? The error on the mean in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullablen_Kmag? Number of measures used in Kmagmeta.numberintnullableo_Kmag? Number of night on which Kmag were takenmeta.numberintnullable2MASSdetails of corresponding source in 2MASS catalog (II/246)meta.ref.urlchar