[vsnet-alert 22906] ASASSN-18acf: superhump period determination

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

Dear colleagues,

 

Yesterday, I announced the detection of superhumps in the light curve of ASASSN-18acf, based on a short CCD photometry session on 2018, Dec 28/29. I have just concluded the analysis of a second observing session of ASASSN-18acf, obtained on 2018, Dec 29/30 at CBA Extremadura Observatory (Spain),  using a 0.40-m f/5.1 telescope and SX-46 CCD camera. The sky was very clear throughout the session.

 

The resulting light curve again shows the presence of a superhump, with an amplitude of 0.23 mag. Combined with yesterday’s observations, I have now been able to perform a period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso). This yields a combined superhump period of 0.0722 +/- 0.0009d. The object was at mag 14.7 (CV) on Dec 29th. 

 

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

 

I will send my observations 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

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