[vsnet-alert 23386] Re: OT J210404.7+463112.9: possible WZ Sge-type dwarf nova candidate

[Denis Denisenko d.v.denisenko@gmail.com via vsnet-alert]

Here is the link to TOCP page where this object was first reported:
http://www.cbat.eps.harvard.edu/unconf/followups/J21040470+4631129.html

I have prepared the 10'x10' DSS color-combined finder chart with three
comparison stars positioned very close to the variable (2-3 arcmin
East of it), with very suitable colors and covering the desirable
range of magnitudes:

http://scan.sai.msu.ru/~denis/J2104+4631-BRIR.jpg

TYC 3588-7713-1 B=8.69 V=8.61
TYC 3588-9299-1 B=9.33 V=9.33
TYC 3588-8651-1 B=10.71 V=10.74

The original image by Nishimura-san posted at CBAT TOCP has 1.6x1.1
degree FOV. I have labeled two brightest stars on it for the
convenience of visual observers:
http://scan.sai.msu.ru/~denis/J2104+4631-Nishimura.jpg

The variable on the image appears to me brighter than V=8.6 comparison
star. Is the 9.2m magnitude underestimated, or is it just JPEG
conversion playing tricks?

Denis Denisenko

On Fri, Jul 12, 2019 at 6:20 PM Kojiguchi Naoto
<kojiguchi at kusastro.kyoto-u.ac.jp> wrote:
>
> OT J210404.7+463112.9 (aka PSN J21040470+4631129): possible WZ Sge-type dwarf nova candidate.
>
>     This outburst is about 8.5 mag amplitude. Mv = 11.77 in quiescence.
>
> PSN J21040470+4631129   2019 07 12.4900*  21 04 04.70 +46 31 12.9   9.2 U             Cyg       9 0