[vsnet-outburst 23202] ASASSN-19ag: new SU UMa type dwarf nova

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

Dear colleagues,

I have just concluded the analysis of my 2019, Jan 07/08 and 08/09 unfiltered CCD photometry sessions of ASASSN-19ag. Observations were made at CBA Extremadura Observatory (Spain),  using a 0.40-m f/5.1 telescope and SX-46 CCD camera, under very clear skies.  Due to fiber optics internet issues with a Spanish telecom provider (meanwhile resolved), the baseline for the observations was rather short.

 

The resulting light curve clearly shows the presence of (most likely early) superhumps with an amplitude of 0.05 mag, hence classifying this object as a new SU UMa type dwarf nova.  A period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined (very) preliminary superhump period of 0.0634 +/- 0.0008d. The object was at mag 12.65 (CV) on Jan 09th. 

 

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

 

Follow-up observations are highly recommended to further refine the superhump period.

 

Best regards
Tonny


 

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

 <http://www.peranso.com> www.peranso.com

 

 

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