Dear colleagues,

I have just completed my analysis of unfiltered CCD observations of GOTO065054.49+593624.51, acquired on Oct 17/18, 2024 at the CBA Extremadura Observatory in Spain. The observations were made using a 0.40-m f/5.1 telescope and SX-46 CCD camera under moderately clear skies, though conditions were only favorable for about 2.2 hours. Since the discovery announcement by T. Killestein et al. on Oct 4, 2024 (ATEL #16842), I have been observing this object across multiple nights, during which no obvious modulations were visible in the light curve - until tonight, when GOTO065054.49+593624.51 exhibited superhumps for the first time.

The superhumps displayed an amplitude of ~0.16 mag. Period analysis employing ANOVA, Lomb-Scargle, Generalized Lomb-Scargle, and PDM methods (Peranso 3.0), yielded a combined superhump period of 0.067 +/- 0.002d. Due to the limited observation window, this value remains uncertain, and I strongly recommend follow-up observations to further track the evolution of the superhumps.

The object was at mag CV = 14.7 on Oct 18th.

The superhump profile currently shows no indication (yet) of a double-waved pattern. The substantial outburst amplitude (> 8 mag), and the prolonged duration for superhumps to develop (approx. 13 days), in conjunction with the spectroscopic classification suggesting it is likely a WZ Sge-type CV (ATEL #16858), firmly establish this object as a new WZ Sge-type dwarf nova.

Image calibration and photometry were done using my new photometry software Phoranso 1.0.5.5.

I will be submitting my observations to AAVSO, CBA, and VSNET for further analysis.

Best 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 *** NEW ***

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