J/A+AS/144/481ivo://CDS.VizieR/J/A+AS/144/481CDSVillata M.Raiteri C.M.Popescu M.D.Sobrito G.De Francesco G.,Lanteri L.Ostorero L.2000-06-24T22:02:51Z2000-06-24T22:02:41ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomyWide-band photometryWe present optical data obtained with the 1.05 m telescope of the Torino Astronomical Observatory for five X-ray selected BL Lacertae objects. The data are in the Johnson's B, V, and Cousins' R bands. As the observing periods include the pointings of the Satellite per Astronomia X ``Beppo'' (BeppoSAX), our optical information will be comparable with the X-ray observations for a better understanding of the properties of these objects. The present data also provide optical information on sources that have been rarely observed in the optical band. Variability on short time scales (a few days) was found only for 1ES 1959+650.2000A&AS..144..481Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/144/481CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/132/361 : Optical observations of eight BL Lacs (Raiteri+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/144/481https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/144/481http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/144/481https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/144/481https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/144/481http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/144/481GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+AS/144/481/tab2-6BVRI observationsBand[BVRI] BandcharHJDObservation dateddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.int1ESObject name (1ES hhmm+dd.d)charmagMagnitude in band (1)magfloate_magrms uncertainty on magmagfloat