Optical Photometric Observations of M31N 2008-12a: Pre- and Post-maximum of the 2015 Eruption

ATel #7979; A. Arai (Kyoto Sangyo University), H. Naito, F. Watanabe, K. Nakajima, Y. Sano (Nayoro Observatory), M. Watanabe (Hokkaido University), S. Kiyota (VSOLJ), H. Maehara (NAOJ), D. Kuroda (NAOJ), N. Kawai (Tokyo Institute of Technology), M. Henze (IEEC/CSIC), M. J. Darnley (LJMU), A. W. Shafter (SDSU), M. Kato (Keio University), for a larger collaboration
on 1 Sep 2015; 22:36 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Akira Arai (arai6a@cc.kyoto-su.ac.jp)

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We report additional multicolor photometry of the 2015 outburst of the remarkable recurrent nova M31N 2008-12a (ATel #7964, #7965, #7967, #7968, #7969, #7974, #7976, see Darnley et al. 2014, 2015 and Henze et al. 2014, 2015 for comprehensive multi-wavelength light curves of previous eruptions). Our observations of the nova were performed by using two Japanese telescopes and two remote telescope systems in USA and Spain.

 
Date UT               Filter   Magnitude         SITE 
2015 Aug 27.239       C        > 19.1           Sierra Remote Observatory, USA (*1) 
2015 Aug 27.677       Rc       > 19.5           Okayama Astrophysical Observatory, Japan (*2) 
2015 Aug 28.4917      C        18.73 ± 0.06    Sierra Remote Observatory, USA (*1)                               
2015 Aug 28.6516      V        18.79 ± 0.11    Nayoro Observatory, Japan (*3) 
2015 Aug 28.6586      V        18.86 ± 0.12    Nayoro Observatory, Japan (*3) 
2015 Aug 29.1006      C        18.60 ± 0.07    AstroCamp Observatory, Spain (*4)                                 
2015 Aug 29.2063      C        18.50 ± 0.06    AstroCamp Observatory, Spain (*4)                           
2015 Aug 30.2041      V        19.40 ± 0.15    Sierra Remote Observatory, USA (*1)   
2015 Aug 30.2347      C        19.30 ± 0.10    Sierra Remote Observatory, USA (*1) 
 
Instruments: 
1. 0.5-m  f/6.5 MITSuME telescope + Apogee Alta U6 
(Kotani et al. 2005, Il Nuovo Cimento C, 58, 755) at Okayama Astrophysical Observatory, Okayama, Japan 
2. 0.61-m f/6.5 CDK astrograph + FLI PL09000 at SRO (Sierra Remote Observatory), Auberry, California, USA, iTelescope.NET 
3. 1.6-m   f/12 Pirka telescope + MSI (Watanabe et al. 2012, SPIE, 8446, 2O) at Nayoro Observatory, Hokkaido, Japan 
4. 0.32-m f/8.0 CDK astrograph + SBIG STXL-6303E at  AstroCamp Observatory, Nerpio, Spain, iTelescope.NET 
The Filter "C" is a CCD with Luminance filter.