Dear colleagues,

I have just finished analysing my unfiltered CCD observations of TCP J23030178+4916384 (aka AT 2023xni) obtained on 2023, Nov 14/15 and Nov 15/16 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. My observations were triggered by this report in TNS: https://www.wis-tns.org/object/2023xni

While no clear periodic signal is present in the Nov 14/15 observations, the object clearly started showing superhumps in the light curve of Nov 15/16. The superhumps have an amplitude of 0.21 mag, establishing TCP J23030178+4916384 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0) yields a combined superhump period of 0.0662 +/- 0.0007 d. The object was at mag CV = 17.5 on Nov 16th. Another observing session of this object is currently ongoing at CBA Extremadura Observatory.

Image calibration and photometry were done using a beta version of Phoranso.

I will send 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 - COMING SOON ***

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