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Optical Photometric Observations of M31N 2008-12a: Pre- and Post-maximum of the 2017 Eruption

ATel #11133; H. Naito, F. Watanabe (Nayoro Observatory), Y. Sano, K. Kuramoto (Hokkaido University), K. Itagaki (Itagaki Observatory), S. Kiyota (VSOLJ), A. Arai (Kyoto Sangyo University), H. Maehara (Kyoto University), K. Matsumoto (Osaka Kyoiku University), A. Fukui (Okayama Astrophysical Observatory, NAOJ, NINS), K. Nishiyama, F. Kabashima (Miyaki-Argenteus Observatory), M. Henze (SDSU), M. J. Darnley (LJMU), A. W. Shafter (SDSU), M. Kato (Keio University), for a larger collaboration
on 6 Jan 2018; 04:36 UT
Credential Certification: Hiroyuki Maehara (h.maehara@oao.nao.ac.jp)

Subjects: Optical, Cataclysmic Variable, Nova, Transient, Variables

Referred to by ATel #: 11134, 11144, 11149, 11214

We report additional multicolor photometry of the 2017 outburst of the remarkable recurrent nova M31N 2008-12a (ATels #11116, #11117, #11118, #11121, #11124, #11125, #11126, #11130, see Darnley et al. 2014, 2015, 2016 and Henze et al. 2014, 2015a, 2015b for comprehensive multi-wavelength light curves of previous eruptions).
The magnitudes and upper limits for the nova are given in the table below.

  
Date UT		  Exp. time		Filter 	Magnitude 	Site 
2017 Dec 31.384   120sec (60s x 2)      none    > 19.0		Itagaki Observatory (Okayama station), Japan (*1) 
2018 Jan 01.4996  60sec			none	18.6		Miyaki-Argenteus Observatory, Japan (*2) 
2018 Jan 01.5186  60sec			none	18.7		Miyaki-Argenteus Observatory, Japan 
2018 Jan 01.529   360sec (60sec x 6)    none    18.7		Itagaki Observatory (Okayama station), Japan 
2018 Jan 02.127   5520sec (120sec x 46)	L	19.14 +/- 0.09	New Mexico Skies, USA (*3) 
2018 Jan 02.214   4500sec (180sec x 25)	L	19.35 +/- 0.09	Sierra Remote Observatory, USA (*4) 
2018 Jan 02.4014  60sec			none	> 19.4		Miyaki-Argenteus Observatory, Japan 
2018 Jan 02.403   1800sec (30sec x 60)	g	19.90 +/- 0.14	Okayama Astrophysical Observatory, Japan (*5) 
2018 Jan 02.403   1800sec (30sec x 60)	r	19.36 +/- 0.08	Okayama Astrophysical Observatory, Japan 
2018 Jan 02.403   1800sec (30sec x 60)	z	19.50 +/- 0.14	Okayama Astrophysical Observatory, Japan 
2018 Jan 03.125   5400sec (180sec x 30)	L	20.12 +/- 0.15	New Mexico Skies, USA 
2018 Jan 03.3979  60sec			none	> 20.0		Miyaki-Argenteus Observatory, Japan 
2018 Jan 03.507	  1800sec (30sec x 60)	g	20.72 +/- 0.16	Okayama Astrophysical Observatory, Japan 
2018 Jan 03.507	  1800sec (30sec x 60)	r	20.29 +/- 0.10	Okayama Astrophysical Observatory, Japan 
2018 Jan 03.507	  1800sec (30sec x 60)	z	> 20.5		Okayama Astrophysical Observatory, Japan 
 
 
Filter ``L'' magnitudes are obtained from the observations with a luminescent (IR cut) filter. 
Telescopes and instruments: 
1. 0.5-m f/6.8 + KAF-1001E CCD 
2. 0.5-m f/6.8 + KAF-1001E CCD 
3. 0.5-m f/4.5 CDK astrograph + FLI-PL11002M CCD 
4. 0.61-m f/6.5 CDK astrograph + FLI-PL09000 CCD 
5. 1.88-m + MuSCAT (Narita et al. 2015, Journal of Astronomical Telescopes, Instruments, and Systems, 1, 045001)