[vsnet-alert 22941] ASASSN-17ag: 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 2019, Jan 17/18 unfiltered CCD photometry sessions of ASASSN-17ag. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and SBIG STT-3200ME camera, under very clear skies but with strong moonlight.  

 

The resulting light curve clearly shows the presence of superhumps with an amplitude of 0.33 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 superhump period of 0.0770 +/- 0.0030d. The object was at mag 15.4 (CV) on Jan 18th. 

 

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