Dear colleagues,
TCP J03173646+7459318 was discovered by XOSS (Xingming Observatory Sky Survey) on 2025 Sep 21.8 at mag 13.78C. The quiescent counterpart is a 20.9 V mag object, implying an outburst amplitude of ~8 mag.
I have just completed the analysis of my unfiltered CCD observations of TCP J03173646+7459318, obtained on 2025 Sep 22/23 at CBA Extremadura Observatory. The data were acquired under clear skies with a 0.40-m f/5.1 telescope and a Moravian G2-4000 CCD.
The light curve clearly reveals double-peaked modulations consistent with early superhumps, with an amplitude of 0.09 mag. A period analysis, using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0600 +/- 0.0006d. The object was measured at mag CV = 13.6 on Sep 23rd.
Image calibration and photometry were performed with the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars within the same frames.
These findings strongly suggest that TCP J03173646+7459318 is a new WZ Sge-type dwarf nova. Continued monitoring is strongly encouraged to study the superhump profile and evolution.
I will submit my observations to AAVSO, CBA and VSNET for further analysis.
With kind regards,
Tonny
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Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
PERANSO : The Light Curve and Period Analysis Software
PHORANSO: Photometric Reduction and Analysis Software