[vsnet-alert 25786] ASASSN-21go: new SU UMa-type dwarf nova

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

Dear colleagues,

I have been observing ASASSN-21go during 6 nights since its discovery on
2021, Apr 22nd by ASAS-SN. The object finally started to show regular
superhumps during my latest unfiltered observing session, obtained on 2021,
Apr 30-May 01 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope
and QHY268M CMOS camera under clear skies. 

Regular superhumps with an amplitude of 0.20 mag are clearly visible in the
resulting light curve, establishing ASASSN-20go 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), yields a combined
superhump period of 0.0517 +/- 0.0009d. The object was at mag CV = 16.6 on
May 01st.

Note that the above superhump period value is much different from the value
of 0.06d reported in [vsnet-outburst 27110], which most likely was spurious.

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

Best regards
Tonny

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Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com

PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com