[vsnet-alert 21857] MASTER OTJ021211.74+475602.7 = ASASSN-15nt: 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 2018, Feb 12/13 unfiltered CCD photometry session of MASTER OTJ021211.74+475602.7 = ASASSN-15nt. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera, under a very clear sky. The resulting light curve shows the presence of small superhumps with an amplitude of 0.033 mag. A period analysis – after detrending the light curve for a linear magnitude decline - using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined (long) superhump period of 0.0986 +/- 0.0018d, hence establishing this object as a new SU UMa type dwarf nova. The object was at mag 14.05 (unfiltered) on Feb 12th.  

 

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

Best regards
Tonny

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Tonny Vanmunster
CBA Belgium Observatory

CBA Extremadura Observatory – NEW !!!
 <http://www.cbabelgium.com> www.cbabelgium.com
 <http://www.peranso.com> www.peranso.com