[vsnet-alert 23411] MASTER OT J203053.79+384020.1 is a new SU UMa-type dwarf nova

[Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert]

Dear colleagues,

I have I have just finished analysing last nights (2019, July 19/20)
unfiltered CCD observations of MASTER OT J203053.79+384020.1, obtained at
CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD
camera, under clear skies.

The resulting light curve clearly shows the presence of superhumps with an
amplitude of 0.19 mag, hence establishing this target as a new SU UMa-type
dwarf nova.

A period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso),
yields a combined superhump period of 0.0683 +/- 0.0023d. The object was at
mag 15.0 (CV) on Jul 19th.

I will send my observations to AAVSO, CBA and VSNET for further analysis,
upon my return from holidays (after July 23rd).

Follow-up observations are evidently recommended.

Best regards
Tonny


-- 
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
www.peranso.com