[vsnet-outburst 25966] ASASSN-15pk: 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-15pk, obtained tonight (2020, Nov 02/03) at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera under (mostly) clear skies. 

Superhumps with an amplitude of 0.28 mag are clearly in the resulting light curve, establishing ASASSN-15pk as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0, in beta testing), yields a combined superhump period of 0.0814 +/- 0.0013d. The object was at mag 16.2 (CV) on Nov 02nd.

I will send my observations (currently large backlog) 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