Optical Photometric Observations of M31N 2008-12a: Pre- and post-maximum of the 2021 eruption
ATel #15068; H. Naito (Nayoro Observatory), S. Kiyota (VSOLJ), Y. Sano (VSOLJ), K. Taguchi (Kyoto University), H. Maehara (NAOJ), A. Arai (NAOJ), K. Itagaki (Itagaki Observatory), M. Kato (Keio University), K. Matsumoto (Osaka Kyoiku University), K. Nishiyama, F. Kabashima (Miyaki-Argenteus Observatory), A. Tajitsu (NAOJ), S. Takagi (Hokkaido University), F. Watanabe (Nayoro Observatory), for a larger collaboration
on 28 Nov 2021; 09:34 UT
Credential Certification: Hiroyuki Maehara (hiroyuki.maehara@nao.ac.jp)
We report additional multicolor photometry of the 2021 eruption of the remarkable recurrent nova
M31N 2008-12a (ATels #15034, #15036, #15037, #15038, #15039, #15040, #15045, #15050, see Darnley et al. 2014,
2015,
2016
and Henze et al.
2014,
2015a,
2015b,
2018
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
2021 Nov 14.59 14400sec (60sec x 240) Clear 18.2 +/- 0.3 Kamagaya, Chiba, Japan (*1)
2021 Nov 15.11 3600sec (120sec x 30) L 18.2 +/- 0.3 Mayhill, New Mexico, USA (*2)
2021 Nov 15.426 300sec (60sec x 5) Rc 18.5 +/- 0.1 Nayoro Observatory, Japan (*3)
2021 Nov 15.518 300sec (60sec x 5) Ic 18.8 +/- 0.2 Nayoro Observatory, Japan (*3)
2021 Nov 15.530 540sec (60sec x 9) V 19.0 +/- 0.1 Nayoro Observatory, Japan (*3)
2021 Nov 16.11 3600sec (120sec x 30) L 18.9 +/- 0.6 Mayhill, New Mexico, USA (*2)
2021 Nov 17.35 1680sec (60sec x 28) Rc > 19.4 Nayoro, Hokkaido, Japan (*4)
2021 Nov 17.36 1620sec (60sec x 27) V > 19.2 Nayoro, Hokkaido, Japan (*4)
2021 Nov 17.38 3600sec (180sec x 20) Rc 20.4 +/- 0.2 Nayoro Observatory, Japan (*3)
2021 Nov 17.49 3600sec (180sec x 20) Ic > 20.3 Nayoro Observatory, Japan (*3)
2021 Nov 20.39 3000sec (*5) g' 22.5 +/- 0.3 Okayama Observatory of Kyoto University, Japan (*6)
2021 Nov 20.39 3000sec (*5) r' 21.3 +/- 0.5 Okayama Observatory of Kyoto University, Japan (*6)
2021 Nov 20.39 3000sec (*5) i' 22.4 +/- 0.7 Okayama Observatory of Kyoto University, Japan (*6)
2021 Nov 21.48 14580sec (180sec x 81) Rc > 22.3 Nayoro Observatory, Japan (*3)
Filter "L" magnitudes are obtained from the observations with a luminance (IR cut) filter.
Telescopes and instruments:
1. 0.25-m f/10 SCT+ QSI 632ws CCD
2. 0.50-m f/4.5 CDK astrograph + FLI-PL11002M CCD (T11, iTelescope.NET)
3. 1.6-m Pirka telescope + MSI (Watanabe et al. 2012)
4. 0.36-m f/11 + FLI-ML1001 CCD
5. 15sec x 40 frames + 20sec x 120 frames
6. 3.8-m Seimei telescope (Kurita et al. 2020) + TriCCS
