Dear colleagues,

Observations, obtained on 2025-07-15 by Dr. N. P. Ikonnikova with 60cm Ritchey–Chrétien telescope of SAI has shown, that TCP J19335406+4220008 is experiencing a rebrightening. Preliminary estimate of V magnitude at 2025-07-15T21:04:39.76 is 16.0 ± 0.03m, while on 2025-07-07 the star was around 19m in V band. So, further observations are encouraged to obtain a rebrightening lightcurve.

Sincerely, Alexander Tarasenkov

вт, 1 июл. 2025 г. в 12:17, tonny.vanmunster@gmail.com:

Dear colleagues,

I have just completed the analysis of my unfiltered CCD observations of TCP J19335406+4220008, obtained on Jun 29/30 and Jun 30/Jul 01, 2025 at CBA Extremadura Observatory (Spain). The data was collected using a 0.40-m f/5.1 telescope and Moravian G2-4000 CCD camera under clear skies. The object was discovered by XOSS (Mi Zhang, Jianlin Xu, Guoyou Sun, Jiangao Ruan, et al.) on Jun 21st.

The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.13 mag, establishing TCP J19335406+4220008 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0615 +/- 0.0003d. The object was measured at mag CV = 14.9 on Jul 01st.

Image calibration and photometry were performed using the latest release of Phoranso, allowing us to simultaneously collect observations of 4 additional interesting VSX stars in the same FOV.

Further observations are encouraged to refine the superhump period.

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/