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[vsnet-campaign-dn 17512] TCP J08374922+0134065: new WZ Sge-type dwarf nova with large early superhump amplitude
by Yusuke Tampo 14 Apr '25

14 Apr '25

TCP J08374922+0134065: new WZ Sge-type dwarf nova with large early superhump amplitude TCP J08374922+0134065 was discovered by Y. Nakamura on 3rd April at 14.7 mag. Based on the suggested counterpart (GALEX J083749.2+013407) with g=20.22(2) and the brightest ASAS-SN measurement with g~13.4 mag, the outburst amplitude is 6.8mag. http://www.cbat.eps.harvard.edu/unconf/followups/J08374922+0134065.html https://asas-sn.osu.edu/sky-patrol/coordinate/dce846f3-485d-4614-bace-a8b3e… Itoh-san has reported the time-resolved observations on 6th April and the light curve shows a double-peaked modulation with a period of ~0.059 d and an amplitude of 0.2 mag with possible eclipses. Thus TCP J08374922+0134065 is a new WZ Sge-type dwarf nova with high inclination. Time-resolved observations are strongly encouraged. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介 Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-campaign-dn 17511] TCP J06455595+1210577: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 02 Apr '25

02 Apr '25

Dear colleagues, I have just completed the analysis of my unfiltered CCD observations of TCP J06455595+1210577, obtained on Apr 01/02, 2025 at CBA Belgium Observatory. The data was collected using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. This object was recently discovered by XOSS and announced as a possible CV candidate (see http://www.cbat.eps.harvard.edu/unconf/followups/J06455595+1210577.html) The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.29 mag, establishing TCP J06455595+1210577 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 0.0731 +/- 0.0014d. The object was measured at mag CV = 16.2 on Apr 01st. Image calibration and photometry were performed using Phoranso, allowing me to simultaneously measure 4 other variables within the field of view of TCP J06455595+1210577. 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 --- 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/>

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[vsnet-campaign-dn 17509] TCP J14034008+7947313: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 08 Mar '25

08 Mar '25

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J14034008+7947313, obtained over the past 7 nights between 2025, Feb 28 and Mar 06 at CBA Belgium Observatory using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. No superhumps were visible in the light curves of this object till 2025, Mar 6/7. The light curve of 2025, Mar 6/7 clearly shows the presence of regular superhumps with an amplitude of 0.18 mag, establishing TCP J14034008+7947313 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 0.0586 +/- 0.0003d. The object was at mag CV = 15.3 on Mar 06th. Image calibration and photometry were done using Phoranso, which allows to simultaneously measure other variables present in the FOV of a variable star. I will send 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 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/>

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[vsnet-campaign-dn 17508] TCP J07222683+6220548: AM CVn star showing a superoutburst
by Yusuke Tampo 28 Feb '25

28 Feb '25

TCP J07222683+6220548: AM CVn star showing a superoutburst The time-resolved observations of TCP J07222683+6220548 aka ZTF25aacfjde have been repoted by Itoh-san, Sano-san, Josch Hambsch and Tamás Tordai. This object showed a 4-mag dip in the middle of the outburst, and time-resolved observations by Itoh-san after the recovery from this dip detected single-peaked variations with a period of 0.03256(2) d, likely an ordinary superhump. Thus TCP J07222683+6220548 is a new AM CVn star showing a superoutburst. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介 Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-campaign-dn 17503] TCP J04272195-2528038; possibly a new AM CVn star in outburst?
by Yusuke Tampo 02 Feb '25

02 Feb '25

TCP J04272195-2528038; possibly a new AM CVn star in outburst? TCP J04272195-2528038 was discovered by Y. Nakamura on 2025-01-09.4837 UT at 14.2 mag. The quiescence counterpart is g_PS1=21.09(5) mag, thus outburst amplitude is ~7 mag. http://www.cbat.eps.harvard.edu/unconf/followups/J04272195-2528038.html https://www.aavso.org/vsx/index.php?view=detail.top&oid=2391199 Itoh-san and myself using the SAAO/Lesedi telescope have reported the time-resolved observations. The SAAO data shows a possible double-peaked modulation with a period of ~42.6 min. In addition, the optical spectrum I obtained with the 1.9m telescope at the SAAO shows only the He I absorption lines, lacking any significant Balmer emission/absorption lines. Further observations are encouraged to establish its classification and determine the variation period. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介 Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-campaign-dn 17502] TCP J17374270+4915116: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 30 Dec '24

30 Dec '24

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J17374270+4915116, obtained over the past 7 nights between 2024, Dec 23/24 and 29/30 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The object started to develop superhumps on Dec 28/29, which further developed on Dec 29/30. The resulting light curve clearly shows the presence of regular superhumps with an amplitude of 0.25 mag, establishing TCP J17374270+4915116 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 0.0589 +/- 0.0002d. The object was at mag CV = 14.6 on Dec 30th. Image calibration and photometry were done using Phoranso, which allowed me to simultaenously measure other variables present in the FOV of this new SU UMa-type dwarf nova. I will send 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 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/>

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[vsnet-campaign-dn 17501] TCP J03493487+3607319 (aka ASASSN-24hf): new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 26 Dec '24

26 Dec '24

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J03493487+3607319 (aka ASASSN-24hf), obtained on 2024, Dec 23/24, 24/25 and 25/26 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 regular superhumps with an amplitude of 0.23 mag, establishing TCP J03493487+3607319 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 0.0697 +/- 0.0002d. The object was at mag CV = 16.7 on Dec 26th. Image calibration and photometry were done using Phoranso, which allowed me to simultaenously measure other variables present in the FOV of this new SU UMa-type dwarf nova. I will send 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 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/>

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[vsnet-campaign-dn 17500] TCP J23291172+4127354: new eclipsing WZ Sge-type dwarf nova
by Yusuke Tampo 07 Dec '24

07 Dec '24

TCP J23291172+4127354: new eclipsing WZ Sge-type dwarf nova TCP J23291172+4127354 was discovered by Y. Nakamura on 2024-12-04.5385 at 14.1 mag (unfiltered). The counterpart in Pan-STARRS1 is g= 21.6 mag (objID= 157753522991272187), hence the outburst amplitude is ~7.5 mag. http://www.cbat.eps.harvard.edu/unconf/followups/J23291172+4127354.html https://www.aavso.org/vsx/index.php?view=detail.top&oid=2390566 Time-resolved observations reported by Itoh-san on the 5th and 6th Dec show double-peaked profiles and superposed eclipses. Its period and amplitude are obtained as 0.05693(2) d and ~0.5 mag (0.3 mag hump + 0.3 mag eclipse). Thus TCP J23291172+4127354 is a new (and yet another!) eclipsing WZ Sge-type dwarf nova. This would be another nice target for time-resolved photometries. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介　Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-campaign-dn 17498] Gaia DR3 3130088774241620608: confirmation as a WZ Sge-type dwarf nova
by Yusuke Tampo 04 Dec '24

04 Dec '24

Gaia DR3 3130088774241620608: confirmation as a WZ Sge-type dwarf nova Itoh-san and J. Hambsch have reported the time-resolved observations of Gaia DR3 3130088774241620608 = TCP J06330104+0303350. The light curve shows a large-amplitude double-hump profile and superposed eclipses. Combining with AAVSO observations by J. Zhao, I obtained the early superhump+eclipse period as 0.05786(1) d. The orbital profile amplitude is ~0.5 mag; 0.3 mag early superhump plus 0.3 mag eclipse. Therefore, Gaia DR3 3130088774241620608 is now confirmed as an eclipsing WZ Sge-type. Time-resolved observations are strongly encouraged! best regards, Yusuke 2024年11月29日(金) 15:56 Yusuke Tampo <tampo(a)kusastro.kyoto-u.ac.jp>: > > TCP J06330104+0303350 = Gaia DR3 3130088774241620608 > > TCP J06330104+0303350 was discovered by T. Kojima on 2024-11-28.76 at > 13.9 mag and now brightened to V=13.4 mag according to TOCP reports. > http://www.cbat.eps.harvard.edu/unconf/followups/J06330104+0303350.html > > This system has already been pointed as a WZ Sge-type cataclysmic > variable candidate in Inight et al 2024, named Gaia DR3 > 3130088774241620608. > https://www.aavso.org/vsx/index.php?view=detail.top&oid=2389763 > https://ui.adsabs.harvard.edu/abs/2024MNRAS.tmp.2451I/abstract > > This outburst is a great opportunity to determine its outburst nature > as well as derive its superhump periods. > Time-resolved observations are encouraged. > > Best regards > Yusuke > > -- > ---------------------------------------------- > > South African Astronomical Observatory, Postdoc fellow > 反保雄介　Yusuke TAMPO > MAIL: tampo(a)kusastro.kyoto-u.ac.jp > MAIL: yusuke(a)saao.ac.za > > ---------------------------------------------- -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介　Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-campaign-dn 17497] TCP J06330104+0303350 = Gaia DR3 3130088774241620608
by Yusuke Tampo 29 Nov '24

29 Nov '24

TCP J06330104+0303350 = Gaia DR3 3130088774241620608 TCP J06330104+0303350 was discovered by T. Kojima on 2024-11-28.76 at 13.9 mag and now brightened to V=13.4 mag according to TOCP reports. http://www.cbat.eps.harvard.edu/unconf/followups/J06330104+0303350.html This system has already been pointed as a WZ Sge-type cataclysmic variable candidate in Inight et al 2024, named Gaia DR3 3130088774241620608. https://www.aavso.org/vsx/index.php?view=detail.top&oid=2389763 https://ui.adsabs.harvard.edu/abs/2024MNRAS.tmp.2451I/abstract This outburst is a great opportunity to determine its outburst nature as well as derive its superhump periods. Time-resolved observations are encouraged. Best regards Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介　Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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