The blazar 3C345 --- at own maximae after 70 days
ATel #17641; V. V. Vlasyuk, O. I. Spiridonova, A. S. Moskvitin (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 31 Jan 2026; 17:39 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)
Subjects: Optical, Blazar
The blazar 3C 345 is still at high activity phase. After decade maximum (R = 14.48 +/- 0.01 mag, MJD 60995.66, ATel#17498) it undergone fast brightness dimming with 2 different slopes: near 0.2 mags per day at first time and ~0.04 mags per day after few light fluctuations around 15.2 mag. The dimming phase terminated at level R ~ 16.0 mag at the middle of December (MJD 61030).
After a month interval of partial invisibility we detected start of new blazar brightening phase at level R ~ 15.4 mag (MJD 61055). The following re-brightening phase was some faster, having light curve slope near -0.08 mags per day and completed by local maximum at R = 14.57 +/- 0.02 mag (MJD 61067.0). So, just after 70 days of intermediate flux the blazar 3C 345 approached second position in apparent brightness over last decade. Our last estimates suggest that 3C345 became as faint as R = 15.1 mag after fast dimming with slope about 0.3 mags per day.
The monitoring of the blazar 3C 345 is continuing: the most of data presented were taken with SAO RAS 1-m and 0.5-m reflectors under good weather condition (seeing (FWHM) < 2 arcsec and good transparency) and have typical accuracy of individual flux estimates about 0.005 mag. We strongly encourage further multi-wavelength studies.
