J/A+A/356/L21ivo://CDS.VizieR/J/A+A/356/L21doi:10.26093/cds/vizier.33569021CDSBelokon E.T.Babadzhanyants M.K.Pollock J.T.2000-04-10T14:36:03Z2000-04-10T14:36:00ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsccd-photometryWe present R- and B-band CCD observations of ON 231 that were made at the Dark Sky Observatory at Appalachian State University (DSO-data) during 37 nights in April 1998 - December 1999. The observations have been obtained in connection with current microvariability studies but this paper presents only the nightly averaged R and B magnitudes together with other details of these observations. These data were used to verify the 1395-day period proposed from the analysis of the prior data (all B-band data available in the 1971-1997 time interval). To transform R-band observations to B we used the equation: B=1.107*R-0.653.2000A&A...356..L21Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/356/L21CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/127/445 : Gamma-ray loud blazars optical monitoring. II. (Raiteri+ 1998)J/A+AS/130/109 : BV(RI)c photometry of ON 231 (Tosti+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/356/L21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/356/L21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/356/L21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/356/L21https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/356/L21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/356/L21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/356/L21/table1R- and B-band photometry of ON 231 (DSO-data)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intHJDst[2450928/2451515] Starting Julian date (1)ddoubleHJDend[2450928/2451515] Ending Julian date (1)ddoubleBand[BR] Standard Johnson spectral bandcharmagmaxMaximum of the brightness (2)magfloatmagminMinimum of the brightness (2)magfloato_magNumber of measurements (3)inte_magrms uncertainty on the object magnitudemagfloatrmscherms uncertainty on the check star magnitudemagfloatmagAverage object magnitude during the observational runmagfloat