[vsnet-alert 22202] Detection of superhumps in SDSS J141118.31+481257.6 with a period of 45.4 min

Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Sat Jun 2 09:38:34 JST 2018


Dear colleagues,

I have just concluded the analysis of my 2018, June 01/02 unfiltered CCD
photometry session of SDSS J141118.31+481257.6. Observations were made at
CBA Extremadura Observatory,  using a 0.40-m f/5.1 telescope and Trius
SX-46 CCD camera, under an initially clear sky followed by increasing high
altitude clouds.

The resulting light curve clearly shows the presence of superhumps with an
amplitude of 0.32 mag. A period analysis using the ANOVA, Lomb-Scargle and
PDM methods (Peranso), yields a combined superhump period of 0.0315 +/-
0.0004d (45.4 min), hence establishing that this object indeed has entered
into a superoutburst, after it had started to brighten again last night. As
expected, the superhump period is very close to the orbital period of the
system (46 min). The object was at mag 15.4 (CV) during my observations.

Follow-up observations are strongly recommended.

Observations will be sent to AAVSO, CBA and VSNET for further analysis. I
will post a light curve on the "Cataclysmic Variables" Facebook group.

Best regards
Tonny

Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
www.peranso.com


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