November 2025 - vsnet-outburst - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-outburst 31594] ASASSN-25eq: new WZ Sge-type dwarf nova, likely a period bouncer
by Yusuke Tampo 17 Dec '25

17 Dec '25

ASASSN-25eq: new WZ Sge-type dwarf nova, likely a period bouncer ASASSN discovered ASASSN-25eq on 2025-11-13.18 UT at 15.07 mag. Then it brightened to g=14.0 mag on 2025-11-15. The VSX lists g=21.9 mag as the counterpart, hence the outburst amplitude is ~8 mag. https://vsx.aavso.org/index.php?view=detail.top&oid=10868208 https://asas-sn.osu.edu/sky-patrol/coordinate/579ca10e-176d-4c3b-958f-03a39… Josch Hambsh and Berto Monard have reported the time-resolved observations of ASASSN-25eq. The light curve shows a 1-mag dip around 2025-11-25 UT. After this dip, clear superhumps are present, with a period of ~0.0645 d. There is no clear modulation before the dip. Thus, ASASSN-25eq is a new WZ Sge-type dwarf nova, with a double-superoutburst feature often observed in a period bouncer system. See e.g. https://ui.adsabs.harvard.edu/abs/2018PASJ...70...47K/abstract Given the absence of clear early superhumps, ASASSN-25eq is presumably a face-on system. A spectrum taken with the Mookodi/Lesedi telescope on 16 Nov. is dominated by Balmer absorption lines, which supports this interpretation. Time-resolved observations are encouraged. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保雄介 EMAIL: tampo(a)kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-outburst 31593] Outbursts 26/11/2025
by Rod Stubbings 27 Nov '25

27 Nov '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks APSV394 251126.483 144 Stu.RASNZ outburst CAROQ 251126.494 141 Stu.RASNZ active CHAZ 251126.451 128 Stu.RASNZ active CHAST 251126.454 142 Stu.RASNZ outburst CMADM 251126.573 150 Stu.RASNZ active CMAHL 251126.572 119 Stu.RASNZ active DORBC 251126.446 149 Stu.RASNZ active ERIXZ 251126.499 151 Stu.RASNZ active ERIAH 251126.497 138 Stu.RASNZ active HYIVW 251126.444 126 Stu.RASNZ outburst HYIVW 251126.492 123 Stu.RASNZ HYIVW 251126.569 120 Stu.RASNZ INDTU 251126.474 140 Stu.RASNZ active INDCS 251126.480 118 Stu.RASNZ active OCTDT 251126.481 146 Stu.RASNZ active PUPBV 251126.570 138 Stu.RASNZ active PUPBX 251126.569 153 Stu.RASNZ active PUPHO 251126.576 144 Stu.RASNZ active SGRV730 251126.440 142 Stu.RASNZ outburst TUCVW 251126.487 156 Stu.RASNZ outburst VOLSY 251126.493 150 Stu.RASNZ active NSV 35 251126.485 150 Stu.RASNZ outburst DDE 76 251126.467 150 Stu.RASNZ active SSS 100511:061754-362655 251126.461 149 Stu.RASNZ active -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31592] TCP J06364062+3318310: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 26 Nov '25

26 Nov '25

Dear colleagues, TCP J06364062+3318310 was discovered by K. Sokolovsky et al. (NMW Survey) on 2025 Nov 17.99 at mag 13.6CV. The quiescent counterpart is a 21.3 r mag star, implying an outburst amplitude of ~8 mag. I have just completed the analysis of my unfiltered CCD time-series observations of TCP J06364062+3318310, obtained on 2025 Nov 25/26 at CBA Extremadura Observatory. The data were acquired under clear skies with a 0.40-m f/5.1 telescope and a Moravian G2-4000 CCD camera. I also obtained observations on several nights prior to Nov 25/26, but those did not reveal any obvious modulation. In contrast, the Nov 25/26 light curve clearly shows regular superhump modulations with an amplitude of 0.30 mag. A period analysis using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0661 +/- 0.0008d. The object was measured at mag CV = 15.3 on Nov 26th. Image calibration and photometry were carried out using the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars in the same field of view. These results establish TCP J06364062+3318310 as a new SU UMa-type dwarf nova. Further follow-up observations are strongly encouraged to refine the superhump period and study its evolution. 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-outburst 31591] Outbursts 25/11/25
by Rod Stubbings 26 Nov '25

26 Nov '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CAROQ 251125.529 140 Stu.RASNZ outburst CENV342 251125.596 149 Stu.RASNZ outburst CHAZ 251125.518 124 Stu.RASNZ active CMADM 251125.533 148 Stu.RASNZ outburst CMAHL 251125.533 119 Stu.RASNZ active DORBC 251125.525 137 Stu.RASNZ outburst ERIXZ 251125.515 150 Stu.RASNZ outburst ERIAH 251125.513 138 Stu.RASNZ active HYIWX 251125.600 130 Stu.RASNZ outburst INDTU 251125.503 151 Stu.RASNZ outburst INDCS 251125.510 118 Stu.RASNZ outburst OCTDT 251125.554 135 Stu.RASNZ outburst PAVGS 251125.507 154 Stu.RASNZ active PUPBV 251125.544 137 Stu.RASNZ outburst PUPBX 251125.544 152 Stu.RASNZ outburst PUPHO 251125.581 144 Stu.RASNZ active VOLSY 251125.528 146 Stu.RASNZ active ASASSN-14GR 251125.497 153 Stu.RASNZ outburst NSV 35 251125.559 154 Stu.RASNZ active DDE 76 251125.496 144 Stu.RASNZ outburst SSS 100511:061754-362655 251125.498 150 Stu.RASNZ active -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31590] Outbursts 21/11/ 2025
by Rod Stubbings 22 Nov '25

22 Nov '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CHAZ 251121.446 120 Stu.RASNZ active CHAST 251121.447 144 Stu.RASNZ active COLTV 251121.471 131 Stu.RASNZ outburst ERIAH 251121.469 144 Stu.RASNZ active ERILT 251121.468 157 Stu.RASNZ outburst ERIPS 251121.451 126 Stu.RASNZ outburst ORICN 251121.491 130 Stu.RASNZ active PAVGS 251121.464 148 Stu.RASNZ outburst PEGHX 251121.477 132 Stu.RASNZ active VOLSY 251121.449 144 Stu.RASNZ active ASASSN-14IK 251121.462 141 Stu.RASNZ active DDE 77 251121.457 138 Stu.RASNZ active SSS 100511:061754-362655 251121.473 146 Stu.RASNZ outburst CTCVJ1940-4724 251121.437 138 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31578] TCP J05384230+7051377: new WZ Sge-type dwarf nova
by 保家大将 21 Nov '25

21 Nov '25

TCP J05384230+7051377: new WZ Sge-type dwarf nova We posted our spectroscopic follow-up result of TCP J05384230+7051377 to ATel. ATel #17485: Spectroscopic confirmation of TCP J05384230+7051377 as a WZ Sge-type dwarf nova <https://www.astronomerstelegram.org/?read=17485> We concluded that this object is a new WZ Sge-type dwarf nova because Hα has a narrow emission core and its spectrum shows a blue continuum with the Balmer and HeI absorption lines. Also, we estimated this object as p ~ 0.06d from Itoh-san's data. However p ~ 0.06d is a weak signal, so further observation will provide a more accurate estimate of the period. best regard, Hiromasa Hoke

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[vsnet-outburst 31588] Outbursts 20/11/2025
by Rod Stubbings 21 Nov '25

21 Nov '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARAV793 251120.451 151 Stu.RASNZ outburst CENV803 251120.703 139 Stu.RASNZ outburst CHAZ 251120.520 128 Stu.RASNZ outburst CHAST 251120.523 143 Stu.RASNZ active CMISV 251120.607 140 Stu.RASNZ active CNCAK 251120.689 130 Stu.RASNZ outburst ERIAH 251120.461 152 Stu.RASNZ outburst HYAV392 251120.672 148 Stu.RASNZ outburst HYIDR 251120.597 156 Stu.RASNZ outburst ORICN 251120.541 128 Stu.RASNZ outburst PEGHX 251120.474 132 Stu.RASNZ outburst PUPHO 251120.591 144 Stu.RASNZ active PYXVZ 251120.603 133 Stu.RASNZ outburst RETVX 251120.496 151 Stu.RASNZ active SGRV2276 251120.467 164 Stu.RASNZ outburst TRADV 251120.498 128 Stu.RASNZ outburst VOLSY 251120.517 144 Stu.RASNZ outburst ASASSN-14IK 251120.469 142 Stu.RASNZ outburst NSV 35 251120.528 154 Stu.RASNZ outburst DDE 77 251120.457 136 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31586] Activity (2025-11-19)
by Hiroyuki Maehara 19 Nov '25

19 Nov '25

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code CASAM 20251119.520 127 Mhh.VSOLJ outburst CYGSS 20251119.491 98 Mhh.VSOLJ Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

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[vsnet-outburst 31584] TCP J09370380+1657350: possible new superoutburst
by Kojiguchi 19 Nov '25

19 Nov '25

TCP J09370380+1657350: possible new superoutburst Gavin Ramsay reported that GOTO detected TCP J09370380+1657350 in outburst on 2025 Nov 18 03:41:50 UT (20251118.1534). Reported magnitude: L = 16.18 (400–700 nm). This object was previously identified as a WZ Sge-type system. For reference, see also the past report: [vsnet-alert 25216] TCP J09370380+1657350: new WZ Sge-type dwarf nova [vsnet-alert 25218] Spectrum of TCP J09370380+1657350 http://www.astronomerstelegram.org/?read=14309 https://vsx.aavso.org/index.php?view=detail.top&oid=2215274

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[vsnet-outburst 31582] TCP J21314718+3825463: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 15 Nov '25

15 Nov '25

Dear colleagues, TCP J21314718+3825463 was discovered by XOSS (Xingming Observatory Sky Survey) on 2025 Nov 07.6 at mag 14.70C. The quiescent counterpart is a 22.5 g mag star, implying an outburst amplitude of ~8 mag. I have just completed the analysis of my unfiltered CCD observations of TCP J21314718+3825463, obtained on 2025 Nov 11/12 and Nov 14/15 at CBA Extremadura Observatory. The data were acquired under clear skies with a 0.40-m f/5.1 telescope and a Moravian G2-4000 CCD camera. The Nov 11/12 light curve did not reveal any obvious modulation. However, the Nov 14/15 light curve clearly shows regular superhump modulations with an amplitude of 0.23 mag. A period analysis performed with ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0567 +/- 0.0016d. The object was measured at mag CV = 16.0 on Nov 15th. Image calibration and photometry were carried out using the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars in the same field of view. These results establish TCP J21314718+3825463 as a new SU UMa-type dwarf nova. Further follow-up observations are strongly encouraged to refine the superhump period and study its evolution. 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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