[vsnet-outburst 26223] ASASSN-20oz: new SU UMa-type dwarf nova

Thu Dec 10 05:05:52 JST 2020

Dear colleagues,

I have just finished analysing my unfiltered CCD observations of ASASSN-20oz, obtained last night (2020, Dec 08/09) 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 0.23 mag are clearly visible in the resulting light curve, establishing ASASSN-20oz 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, release end of December), yields a combined superhump period of 0.0598 +/- 0.0007d. The object was at mag 16.3 (CV) on Dec 08th.

The superhump profile shows a possible (but weak) double-waved pattern, leaving open the possibility that this is a WZ Sge-type dwarf nova. Follow-up observations are recommended to further analyse this.

I will send my observations (currently large backlog) to AAVSO, CBA and VSNET for further analysis.

Best regards
Tonny

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

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