[vsnet-outburst 25597] ASASSN-15ow: new SU UMa-type dwarf nova

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

Dear colleagues,

I have just finished analysing my unfiltered CCD observations of ASASSN-15ow, obtained last night 2020, Aug 27/28 at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. 

Superhumps with an amplitude of 0.12 mag are clearly in my light curve, establishing ASASSN-15ow as a new SU UMa-type dwarf nova. I also observed this target on Aug 25/26 and Aug 26/27, but modulations were much less pronounced those nights. 

A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0, under development), yields a combined long superhump period of 0.0592 +/- 0.0018d. The object was at mag 15.7 (CV) on Aug 28th.

I will send my observations to AAVSO, CBA and VSNET for further analysis.

Follow-up observations are recommended to refine the superhump period.

Best regards
Tonny

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