[vsnet-alert 22438] ASASSN-18sx: 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, Aug 21/22 and Aug 22/23 unfiltered CCD photometry sessions of ASASSN-18sx. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera, under clear skies. 

 

The resulting light curve of Aug 21/22 reveals early superhumps with an amplitude of 0.16 mag, while the light curve of Aug 22/23 clearly shows the presence of superhumps with an amplitude of 0.31 mag. A preliminary period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined superhump period of 0.0692 +/- 0.0007d for Aug 22/23.  The object was at mag 15.9 (CV) on Aug 23rd. I will publish both lightcurves on the “Cataclysmic Variables” Facebook page.

 

Observations will be sent 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