Recurrent Nova M31N 2008-12a: photometric measurements

ATel #15802; P. Erdman (ERAU), M. J. Darnley (LJMU), M. W. Healy (LJMU), A. W. Shafter (SDSU), and S. C. Williams (Turku), on behalf of the 12a Collaboration
on 10 Dec 2022; 14:01 UT
Credential Certification: Matt Darnley (matt_darnley@icloud.com)

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A series of photometric measurements have been made of the 2022 eruption of recurrent nova M31N 2008-12a, prior to and after its discovery (ATel #15786). The data were obtained between 2022-11-25 - 2022-12-07 with the 24 inch CDK Cassegrain telescope equipped with a SBIG STX 16803 detector with Omega SDSS r' filter, located in Daytona Beach, Florida (ATel #9857, #9881).

The derived magnitudes were calibrated with 6 SDSS standard stars in the field near the nova (M31N 2008-12a finder chart), all near 18 mag. The pre-discovery measurement was a brief monitor image, intermediate measurements were a total exposure time of ~1 hour each, and the final measurement had a total exposure time of 2.5 hours. All measurements utilized 300 sec individual frames. Moonlight was strong, and the final measurement was at the very limit of detectability.

 
2022-11-25.06    > 20 mag 
 
2022-12-04.09    18.7 +/-0.1 
2022-12-04.12    18.7 
2022-12-04.19    18.8 
2022-12-04.23    18.8 
 
2022-12-07.13    21.0 +/-0.15