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Optical Photometric Observations of M31N 2008-12a: Pre- and Post-maximum of the 2016 Eruption

ATel #9891; H. Naito, F. Watanabe (Nayoro Observatory), Y. Sano, K. Kuramoto (Hokkaido University), K. Itagaki (Itagaki Observatory), S. Kiyota (VSOLJ), A. Arai (Kyoto Sangyo University), K. Matsumoto, N. Kojiguchi, Y. Sugiura (Osaka Kyoiku University), H. Maehara (NAOJ), K. Nishiyama, F. Kabashima (Miyaki-Argenteus Observatory), M. Henze (IEEC/CSIC), M. J. Darnley (LJMU), A. W. Shafter (SDSU), M. Kato (Keio University), for a larger collaboration
on 22 Dec 2016; 05:17 UT
Credential Certification: Hiroyuki Maehara (h.maehara@oao.nao.ac.jp)

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

Referred to by ATel #: 9906, 9907

We report additional multicolor photometry of the 2016 outburst of the remarkable recurrent nova M31N 2008-12a (ATel #9848, #9852, #9853, #9857, #9861, #9864, #9865, #9872, #9874, #9881 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. We performed a reanalysis of the data taken on Dec 12.459 and found that the nova was detected at the magnitude of 18.4 +/- 0.2.

  
Date UT			Filter 	Magnitude 	Site 
2016 Dec 11.34		none	> 19.0		Nayoro Observatory, Japan (*1) 
2016 Dec 11.37115	V	> 19.1		Kiso Observatory, Japan (*2) 
2016 Dec 11.38238	Rc	> 18.0		Okayama Astrophysical Observatory, Japan (*3) 
2016 Dec 11.389		Rc	> 18.8		Osaka Kyoiku University, Japan (*4) 
2016 Dec 11.47962	none	> 19.0		Miyaki-Argenteus Observatory, Japan (*5) 
2016 Dec 12.0909 	C	> 18.3		New Mexico Skies, USA (*6) 
2016 Dec 12.459         none    18.4  +/- 0.2   Itagaki Observatory (Yamagata station), Japan (*7) 
2016 Dec 12.7822 	C	17.85 +/- 0.10	AstroCamp Observatory, Spain (*8-1) 
2016 Dec 12.9782 	C	17.91 +/- 0.14	AstroCamp Observatory, Spain (*8-2) 
2016 Dec 13.1092 	C	18.06 +/- 0.07  New Mexico Skies, USA 
2016 Dec 13.7976 	C	18.79 +/- 0.23	AstroCamp Observatory, Spain (*8-1) 
2016 Dec 14.1390 	C	19.11 +/- 0.10	New Mexico Skies, USA 
2016 Dec 14.378         none    19.3  +/- 0.2   Itagaki Observatory (Okayama station), Japan (*9) 
2016 Dec 14.38311	Rc	> 16.3		Okayama Astrophysical Observatory, Japan 
2016 Dec 14.43503	V	> 18.2		Kiso Observatory, Japan 
2016 Dec 14.47		Rc	19.1 +/- 0.1	Osaka Kyoiku University, Japan 
2016 Dec 15.36662	V	> 20.0		Kiso Observatory, Japan 
2016 Dec 15.37		R	> 20.2		Nayoro Observatory, Japan 
2016 Dec 15.44		Ic	> 21.0		Nayoro Observatory, Hokkaido University, Japan (*10) 
2016 Dec 15.50447	Rc	> 18.0		Okayama Astrophysical Observatory, Japan 
2016 Dec 16.44862	none	> 20.2		Miyaki-Argenteus Observatory, Japan 
2016 Dec 16.50		Rc	> 18.7		Osaka Kyoiku University, Japan 
2016 Dec 17.467		none	> 20.5		Itagaki Observatory (Okayama station), Japan 
2016 Dec 17.52 		Rc	> 19.3		Osaka Kyoiku University, Japan 
2016 Dec 18.46		Rc	> 20.6		Nayoro Observatory, Hokkaido University, Japan		 
2016 Dec 19.42		none	> 20.5		Nayoro Observatory, Japan 
2016 Dec 19.44		Rc	> 20.5		Nayoro Observatory, Hokkaido University, Japan 
2016 Dec 19.458		Ic	> 21.8		Nayoro Observatory, Hokkaido University, Japan 
 

Filter "C" magnitudes are obtained from the observations with a luminescent (IR cut) filter. Telescopes and instruments: 1. 0.4-m f/10 Meili telescope + SBIG STL-1001E CCD 2. 1.05-m Schmidt telescope + KWFC (Sako et al. 2012, SPIE, 8446, 84466L) 3. 0.5-m f/6.5 MITSuME telescope + Apogee Alta U6 (Kotani et al. 2005, Il Nuovo Cimento C, 58, 755) 4. 0.51-m f/12 + Andor DW936N-BV 5. 0.5-m f/6.8 + FLI 1001E CCD 6. 0.5-m f/4.5 CDK astrograph + FLI-PL11002M CCD 7. 0.6-m f/5.7 + CCD 8-1. 0.43-m f/6.8 CDK astrograph + SBIG STL-11000M CCD 8-2. 0.32-m f/8.0 CDK astrograph + SBIG STXL-6303E CCD 9. 0.5-m f/6.8 + CCD 10. 1.6-m f/12 Pirka telescope + MSI (Watanabe et al. 2012, SPIE, 8446, 2O)