[vsnet-alert 26104] ASASSN-21no: new SU UMa-type dwarf nova

Thu Jul 29 20:29:47 JST 2021

Dear colleagues,

I have just finished analysing my CCD observations of ASASSN-21no, obtained
on 2021, July 28/29 at CBA Extremadura Observatory, using a 0.40-m f/5.1
telescope and SX-46 CCD camera under clear skies. My observations were
triggered by [vsnet-outburst 27523].

Regular superhumps with an amplitude of 0.25 mag are clearly visible in the
resulting light curve, establishing ASASSN-21no 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 0.0597 +/- 0.0009d. The object was at mag CV = 15.5 on
July 29th.

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