J/ApJS/281/44ivo://CDS.VizieR/J/ApJS/281/44CDSYuan Y.-H.Chen Q.-M.Liu Y.-T.Liang B.-Y.Yang W.-X.Ou L.-J.,Chen G.-H.2026-08-10T11:41:50Z2026-08-10T12:39:57ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleibl-lacertae-objectsphotometryvisible-astronomyWe present a comprehensive multiband optical monitoring and spectral analysis of the blazar OJ 287, conducted using the 1.26m National Astronomical Observatory-Guangzhou University Infrared/Optical telescope (NGT). During an intensive 17 day observational campaign from 2022 December to 2023 January, we obtained 2716 high-quality photometric observations (929 in the g band, 887 in the r band, and 900 in the i band). The data reveal significant variability across all bands. Our main findings are as follows. (1) Significant magnitude variations were detected: {Delta}m_g_=0.945+/-0.048mag (g band), {Delta}m_r_=0.648+/-0.023mag (r band), and {Delta}m_i_=0.945+/-0.051mag (i band). (2) Numerous intraday variability (IDV) events were identified, with characteristic parameters ({Delta}m, {Delta}T, and VR={Delta}m/{Delta}T) showing consistent patterns between the g and r bands but distinct behavior in the i band. (3) Successful modeling of intraday light curves using a multi-Gaussian function, yielding brightening ({Delta}T_b_') and dimming ({Delta}T_d_') timescales, and revealing an average peak separation of {Delta}Tc=42.96+/-0.99 minutes that appears to be frequency independent. (4) Development of a novel radiation framework suggesting that the observed IDV phenomena originate from multiple components-with the frequency-independent variations attributable to the central black hole, while frequency-dependent variations stem from jet and accretion disk processes.2025ApJS..281...44Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/44CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/AJ/132/1256 : BATC e, i and m photometry of OJ 287 (Wu+, 2006)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/A+A/559/A20 : Historical outbursts of OJ287 (Hudec+, 2013)J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)J/ApJ/837/45 : 2006-2012 Rc-band & 4.8GHz obs. of AO 0235+164 (Fan+, 2017)J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)J/AJ/157/95 : Optical variability of OJ 287 in 2016-2017 (Gupta+, 2019)J/ApJS/269/60 : Optical monitoring from 2020-2022 of BL Lac (Yuan+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/281/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/281/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/281/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/281/44https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/281/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/281/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJS/281/44/table2NGT g, r, and i band observations of OJ 287recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDg[17.86/72.93] Julian Date in g-band, JDg-2459900dtime.epoch;em.opt.Bfloatgmag[15.36/16.32] Apparent g-band magnitudemagphot.mag;em.opt.Bfloate_gmag[0.007/0.05] Uncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatJDr[17.86/72.96]? Julian Date in r-band, JDr-2459900dtime.epoch;em.opt.Rfloatnullablermag[14.78/15.44]? Apparent r-band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag[0.008/0.02]? Uncertainty in rmagmagstat.error;phot.mag;em.opt.RfloatnullableJDi[17.86/72.98]? Julian Date in i-band, JDi-2459900dtime.epoch;em.opt.Ifloatnullableimag[13.98/14.94]? Apparent i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.015/0.045]? Uncertainty in imagmagstat.error;phot.mag;em.opt.Ifloatnullable