Recurrent nova M31N 2008-12a: Multicolor optical photometry of the 2017 eruption

ATel #11124; K. Hornoch, H. Kucakova (Astronomical Institute, Ondrejov), M. Henze (SDSU), M. J. Darnley (LJMU), A. W. Shafter (SDSU), S. Kafka (AAVSO), M. Kato (Keio University), S. C. Williams (Lancaster), for a larger collaboration
on 3 Jan 2018; 15:35 UT
Credential Certification: Martin Henze (henze@ice.cat)

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We report additional multicolor optical photometry of the 2017 eruption (ATels #11116, #11117, #11118, #11121) of the remarkable recurrent nova M31N 2008-12a (Henze et al. 2014, 2015a, 2015b; Darnley et al. 2014, 2015, 2016) acquired with the 0.65-m telescope at the Ondrejov observatory under variable conditions. For the measurements, we used co-added images obtained from many single 90-s exposures to suppress the effect of high background caused by strong moonlight. The results presented below are consistent with the expected rapid fading of the nova observed during previous eruptions (e.g. ATels #9848, #9861 or ATels #7964, #7976).

 
   Date UT        Band     Magnitude    Total exposure [s] 
 
2018 01 01.723     V     18.91 ± 0.08         1800 
2018 01 01.840     V     19.03 ± 0.08         2070 
 
2017 12 31.829     R     18.18 ± 0.09         1260 
2018 01 01.682     R     18.50 ± 0.08         1080 
2018 01 01.796     R     18.57 ± 0.06         1350 
2018 01 01.864     R     18.60 ± 0.05         1800 
2018 01 02.768     R     19.37 ± 0.14         1170 
2018 01 02.921     R     19.42 ± 0.11         3510 
 
2018 01 01.701     I     18.24 ± 0.09         1800 
2018 01 01.816     I     18.43 ± 0.10         1800