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Recurrent Nova M31N 2008-12a: optical photometric follow up

ATel #9857; P. Erdman (ERAU), A. Kaur (Clemson University), T. Oswalt (ERAU), D. Burke (ERAU), D. H. Hartmann (Clemson University), M. Henze (CSIC-IEEC), M. J. Darnley (LJMU), A. W. Shafter (SDSU), J. Horst (SDSU) (on behalf of a larger collaboration)
on 14 Dec 2016; 06:34 UT
Credential Certification: Allen W. Shafter (ashafter@mail.sdsu.edu)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 9861, 9865, 9872, 9874, 9881, 9883, 9885, 9891, 9906, 9907

We report optical photometric observations of the 2016 outburst of M31N 2008-12a, which was recently discovered with the 50 cm telescope at the Itagaki Astronomical Observatory (see ATel #9848). Our observations were obtained between 2016 Dec 13.10 UT and Dec 14.03 UT with the 24-in CDK Cassegrain telescope, equipped with the SBIG STX 16803 detector and Omega SDSS r' filter, located at the Embry Riddle Aeronautical University, Florida.

The derived magnitudes in r' band were calibrated with 14 stars in the field of the nova. In total, we obtained a set of 15 images, each with a 600 s exposure time. For each exposure, the r' magnitude of M31N 2008-12a is listed in the table below.

Optical Observations
UT r' mag
13.103 18.02 ± 0.03
13.110 18.00 ± 0.04
13.117 18.00 ± 0.04
13.125 18.08 ± 0.05
13.132 18.11 ± 0.05
13.139 17.98 ± 0.04
13.146 18.13 ± 0.05
13.154 18.03 ± 0.05
13.161 18.12 ± 0.05
13.201 18.39 ± 0.07
13.208 18.37 ± 0.07
13.216 18.19 ± 0.06
13.223 18.31 ± 0.07
13.230 18.37 ± 0.07
14.030 18.85 ± 0.04

In addition, a 15 min Johnson R-band image taken on 2016 December 13.125 UT with the 40-in reflector at San Diego State's Mount Laguna Observatory (MLO) yielded R=17.97 ± 0.05. Additional MLO magnitudes will be published in a subsequent ATel.