[vsnet-alert 22433] CY CrB: new SU UMa type dwarf nova

Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Tue Aug 21 08:01:02 JST 2018

Dear colleagues,

I have just concluded the analysis of my 2018, Aug 19/20 and Aug 20/21 (observations still ongoing) V-filtered CCD photometry sessions of CY CrB. Observations were made at CBA Extremadura Observatory (Spain),  using a 0.40-m f/5.1 telescope and SX-46 CCD camera, under clear skies. 


The resulting light curve of Aug 19/20 did not reveal superhumps, but the intermediate light curve of Aug 20/21 clearly shows the presence of superhumps with an amplitude of 0.17 mag. A very preliminary period analysis using the ANOVA and PDM methods (Peranso), yields a combined superhump period of 0.066 +/- 0.002d. The object was at mag 12.35 (V) on Aug 20th. I will publish my preliminary lightcurve on the “Cataclysmic Variables” Facebook page.


Astrometry: 16h 22m 12.47s, +34° 11’ 46.6” (with 0.3” residual).

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 Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
 <http://www.cbabelgium.com> www.cbabelgium.com

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



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