Dear colleagues
I have collected further observations of this target over the past 2 nights. The combined light curve shows several large amplitude superhumps. A period analysis using the ANOVA, Generalized-Lomb-Scargle, PDM and Conditional Entropy methods (Peranso 3.0), yields a combined superhump period of 0.0803 +/- 0.0007d. The object is still bright at mag CV = 14.7.
Best regards
Tonny
From: cba-chat <cba-chat-bounces@cbastro.org> On Behalf Of tonny.vanmunster@gmail.com
Sent: Sunday, 29 January 2023 04:52
To: cba-chat@cbastro.org; 'Kenta TAGUCHI' <kentagch@kusastro.kyoto-u.ac.jp>; vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp; 'Taichi Kato' <tkato@kusastro.kyoto-u.ac.jp>; vsnet-campaign-dn@ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar@yahoogroups.com; 'vsnet-outburst' <vsnet-outburst@ooruri.kusastro.kyoto-u.ac.jp>
Subject: (cba:chat) TCP J04361641+5628241: new SU UMa-type dwarf nova
Dear colleagues,
TCP J04361641+562824 (aka AT 2023ayf) has been very recently detected by the XOSS team (see TNS Astronomical Transient Report No. 170114). I have just finished analysing my unfiltered CCD observations of TCP J04361641+5628241, obtained on 2023, Jan 28/29 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies.
The resulting light curve clearly shows the presence of a superhump with an amplitude of 0.39 mag, establishing TCP J04361641+5628241 as a new SU UMa-type dwarf nova. An accurate period analysis was not yet possible, due to the lack of multiple superhumps within the observation window, but it clearly is an object with a long superhump period. A rough estimate puts it at 0.095d, but further observations are needed to firmly establish the superhump period. The object was at mag CV = 14.7 on Jan 28th.
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
PERANSO: The Light Curve and Period Analysis Software