Dear colleagues, TCP J08460573+1047397 was discovered by the NMW-TexasTech transient survey (K. Sokolovsky et. al.) on 2026 Mar 21.2 at mag CV = 14.5. The quiescent counterpart is a 22.5 g mag star, implying an outburst amplitude of ~8 mag. I have just completed the analysis of my unfiltered CCD time-series observations of TCP J08460573+1047397, obtained on 2026 Mar 31/Apr 01 at CBA Belgium Observatory. The data were acquired under mostly clear skies with a 0.40-m f/10.0 telescope and a QHY-268M CMOS camera. I have observed this object on several nights between Mar 21st and Apr 01st but no obvious modulations were seen. However, the Mar 31/Apr 01 light curve clearly shows regular superhump modulations with an amplitude of 0.18 mag. A period analysis using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0643 +/- 0.0008d. The object was measured at mag CV = 15.6 on Apr 01st. Image calibration and photometry were carried out using the latest release of Phoranso, which enabled simultaneous photometry of additional variable stars in the same field of view. These results establish TCP J08460573+1047397 as a new SU UMa-type dwarf nova. Further follow-up observations are 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 --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.co <http://www.cbabelgium.com/> m