Dear colleagues,

TCP J06364062+3318310 was discovered by K. Sokolovsky et al. (NMW Survey) on 2025 Nov 17.99 at mag 13.6CV. The quiescent counterpart is a 21.3 r mag star, implying an outburst amplitude of ~8 mag.

I have just completed the analysis of my unfiltered CCD time-series observations of TCP J06364062+3318310, obtained on 2025 Nov 25/26 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 camera.

I also obtained observations on several nights prior to Nov 25/26, but those did not reveal any obvious modulation. In contrast, the Nov 25/26 light curve clearly shows regular superhump modulations with an amplitude of 0.30 mag. A period analysis using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0661 +/- 0.0008d. The object was measured at mag CV = 15.3 on Nov 26th.

Image calibration and photometry were carried out using the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars in the same field of view.

These results establish TCP J06364062+3318310 as a new SU UMa-type dwarf nova. Further follow-up observations are strongly encouraged to refine the superhump period and study its 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

http://www.cbabelgium.co http://www.cbabelgium.com/ m

PERANSO : The Light Curve and Period Analysis Software

http://www.peranso.co http://www.peranso.com/ m

PHORANSO: Photometric Reduction and Analysis Software

http://www.phoranso.com http://www.phoranso.com/