Recurrent nova M31N 2008-12a: Early multicolour optical photometry of the 2019 eruption
ATel #13279; K. Hornoch, H. Kucakova (Astronomical Institute, Ondrejov), M. Wolf (Astronomical Institute, Charles U., Prague), P. Zasche (Astronomical Institute, Charles U., Prague), M. J. Darnley (LJMU), M. Henze (SDSU), A. W. Shafter (SDSU), S. C. Williams (Turku), S. Kafka (AAVSO), on behalf of the 12a Collaboration
on 7 Nov 2019; 17:54 UT
Credential Certification: Matt Darnley (M.J.Darnley@ljmu.ac.uk)
We report early multicolour optical photometry of the 2019 eruption (ATels #13269, #13273, #13274) of the remarkable recurrent M31 nova M31N 2008-12a (see ATels #5607, #6527, #7964, #9848, #11116, #12177 for earlier detections as well as Darnley et al. 2014, 2015, 2016 and Henze et al. 2014, 2015a, 2015b, 2018, for comprehensive multi-wavelength studies of previous eruptions).
The data were acquired with the 0.65-m telescope (D65) at the Ondrejov observatory
under variable conditions and with the Danish 1.54-m telescope (DK154) at La Silla.
For the measurements, we used co-added images obtained from many single 90-s
exposures to suppress the effect of relatively high background caused by
moonlight. The results presented below indicate that the nova was again caught
on its rise to maximum.
Date UT Band Magnitude Total exposure [s] Telescope
2019 11 07.097 B 18.37 ± 0.05 450 DK154
2019 11 06.957 V 18.64 ± 0.07 1080 D65
2019 11 07.015 V 18.59 ± 0.06 1080 D65
2019 11 07.103 V 18.49 ± 0.04 360 DK154
2019 11 06.943 R 18.31 ± 0.06 900 D65
2019 11 07.003 R 18.26 ± 0.05 900 D65
2019 11 07.109 R 18.20 ± 0.03 360 DK154
2019 11 07.689 R 18.24 ± 0.05 720 D65
2019 11 06.989 I 18.34 ± 0.06 1350 D65
2019 11 07.032 I 18.35 ± 0.05 1440 D65
This work is based (in part) on data collected with the Danish 1.54-m telescope
at the ESO La Silla Observatory.
