[vsnet-outburst 25746] ASASSN-20mj: new SU UMa-type dwarf nova

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

Dear colleagues,

I have just inspected my ongoing unfiltered CCD observations of ASASSN-20mj (2020, Sep 24/25), obtained at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. 

Some preliminary conclusions: superhumps with an amplitude of ~0.26 mag are clearly in my light curve, establishing ASASSN-20mj as a new SU UMa-type dwarf nova.  A period analysis using the ANOVA method (Peranso 3.0, in Beta test), yields a superhump period of 0.0754 +/- 0.0014d. The object was at mag 15.1 (CV) on Sep 25th.

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
Beta testers wanted for Peranso 3.0: see www.peranso.com