[vsnet-alert 23863] ASASSN-20al: new SU UMa-type dwarf nova

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

Dear colleagues,

I have just concluded the analysis of my 2020, Jan 13/14 unfiltered CCD photometry session of ASASSN-20al. Observations were made 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 0.22-mag superhumps, hence establishing ASASSN-20al 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 0.0747 +/- 0.0006d. The object was at mag 15.7 (CV) on Jan 14th. 

Observations will be sent to AAVSO, CBA and VSNET for further analysis. 

Follow-up observations are recommended to further study the evolution of superhumps in this system.

Best regards
Tonny

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