[vsnet-alert 22806] ASASSN-18aan: new eclipsing 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, Dec 04/05 unfiltered CCD photometry session of ASASSN-18aan. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera. The sky initially was clear, but I then had to stop observations due to clouds. 

 

The resulting light curve covers a time span of 2.8 hours and clearly reveals the presence of an eclipse, superimposed over a superhump, hence classyfing this object as a new UGSU+E type dwarf nova. The eclipse depth is 0.45 mag and the duration (ingress-egress) is approx 35 minutes. Due to the limited observing period, I can not accurately determine the superhump period, nor the orbital period, as I only observed one eclipse. The object was at mag 15.6 (CV) on Dec 4th, 2018.

 

Follow-up observations are urgently required to further determine the characteristics of this interesting variable star.

 

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

 

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