[vsnet-alert 22930] ASASSN-19an: 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 09/10 unfiltered CCD photometry sessions of ASASSN-19an. 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.  

The resulting light curve clearly shows the presence of superhumps with an amplitude of 0.16 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 0.0604 +/- 0.0008d. The object was at mag 15.4 (CV) on Jan 10th. 

 

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