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[vsnet-outburst 31575] 1eRASS J072044.9-402838 = PNV J07204545-4028357 = ASASSN-25ee: new SU UMa-type dwarf nova, likely WZ Sge-type
by Yusuke Tampo 05 Nov '25

05 Nov '25

1eRASS J072044.9-402838 = PNV J07204545-4028357 = ASASSN-25ee: new SU UMa-type dwarf nova, likely WZ Sge-type 1eRASS J072044.9-402838 was originally identified as a CV candidate in Rodriguez et al. (2025), G = 19.2 mag at ~267 pc, hence its absolute magnitude of ~12 mag. https://vsx.aavso.org/index.php?view=detail.top&oid=10868116 https://ui.adsabs.harvard.edu/abs/2025PASP..137a4201R/abstract ASASSN and John Seach discovered its 2025 outburst, peaking at ~11.0 mag around 20th October. https://www.astronomy.ohio-state.edu/asassn/transients.html http://www.cbat.eps.harvard.edu/unconf/followups/J07204545-4028357.html We, the SAAO team, obtained the time-resolved photometries and a snapshot spectrum of 1eRASS J072044.9-402838 on 3rd Nov. The light curve shows likely superhumps with a rough period of ~0.059 d. The spectrum shows Balmer absorption lines from the accretion disk and a superposed narrow emission component in Hα. Hence, 1eRASS J072044.9-402838 is now confirmed as (at least) a SU UMa-type dwarf nova, and probably a WZ Sge-type dwarf nova, considering its large outburst amplitude, long outburst duration, and short superhump period. Further time-resolved observations are encouraged to establish its superhump period and changes. 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 31576] TCP J05415572-2308340: new WZ Sge-type dwarf nova
by Yusuke Tampo 04 Nov '25

04 Nov '25

TCP J05415572-2308340: new WZ Sge-type dwarf nova The NMW survey discovered TCP J05415572-2308340 at 13.2 mag on 16 Oct. The counterpart is Gaia EDR3 2963574610161432960 G= 20.65(1) mag. https://vsx.aavso.org/index.php?view=detail.top&oid=10868112 http://www.cbat.eps.harvard.edu/unconf/followups/J05415572-2308340.html Josch Hambsh and Itoh-san have reported the time-resolved observations of TCP J05415572-2308340. After 23 Oct 2025, this shows the single-peaked superhumps with a mean period of 0.05496(2) d and an amplitude of 0.08 mag. Before this epoch, there were no clear modulations. Thus, this long waiting time before the appearance of ordinary superhumps, together with a large outburst amplitude and long outburst duration, suggests that TCP J05415572-2308340 is a new WZ Sge-type dwarf nova. 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 31574] maintenance power outrage
by 保家大将 30 Oct '25

30 Oct '25

Dear, VSNET members, I'm Hiromasa Hoke, a master student of Kyoto University. I must inform you all that there will be a maintenance power outage for the Kyoto Univ. building on this weekend, so VSNET server must be shut down in advance. The shutdown is scheduled to occur around 16:00 JST on November 1st (UTC: 07:00), and the system is scheduled to be restored at around 11:30 JST (UTC: 02:30) on November 4th. Thank you for your cooperation. Hiromasa Hoke

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[vsnet-outburst 31573] outbursts 29/10/2025
by Rod Stubbings 30 Oct '25

30 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARAV793 251029.443 142 Stu.RASNZ active CAROY 251029.567 129 Stu.RASNZ active CHAST 251029.562 143 Stu.RASNZ active CMAWZ 251029.574 146 Stu.RASNZ active CMAHL 251029.576 120 Stu.RASNZ active MENAD 251029.556 148 Stu.RASNZ active NORHP 251029.432 146 Stu.RASNZ outburst ORICN 251029.573 128 Stu.RASNZ active PAVV548 251029.467 140 Stu.RASNZ active PEGHX 251029.546 132 Stu.RASNZ active PSATY 251029.651 141 Stu.RASNZ active PUPBX 251029.644 151 Stu.RASNZ outburst PUPHO 251029.649 139 Stu.RASNZ active RETVX 251029.448 146 Stu.RASNZ outburst TRADV 251029.456 142 Stu.RASNZ active VOLSY 251029.565 147 Stu.RASNZ active ASASSN-14GR 251029.540 146 Stu.RASNZ active NSV 11274 251029.453 145 Stu.RASNZ active DDE 76 251029.538 142 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 31572] Outbursts 28/10/2024
by Rod Stubbings 29 Oct '25

29 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks AQLUU 251028.488 130 Stu.RASNZ active ARAAT 251028.455 134 Stu.RASNZ outburst ARAV793 251028.460 142 Stu.RASNZ active CAROQ 251028.632 139 Stu.RASNZ outburst CAROY 251028.633 126 Stu.RASNZ active CENV442 251028.702 126 Stu.RASNZ outburst CETFZ 251028.483 134 Stu.RASNZ active CHAST 251028.637 143 Stu.RASNZ active CMAWZ 251028.650 146 Stu.RASNZ active CMADM 251028.641 156 Stu.RASNZ active CMAHL 251028.640 119 Stu.RASNZ active CMISV 251028.694 134 Stu.RASNZ active CRABP 251028.468 139 Stu.RASNZ active ERIPS 251028.485 132 Stu.RASNZ active HYIWX 251028.420 142 Stu.RASNZ active HYIDR 251028.419 150 Stu.RASNZ active MENAD 251028.506 147 Stu.RASNZ active OCTAO 251028.620 159 Stu.RASNZ active OCTBE 251028.616 158 Stu.RASNZ active ORICN 251028.609 128 Stu.RASNZ active ORIV1159 251028.607 146 Stu.RASNZ active PAVGS 251028.517 154 Stu.RASNZ outburst PAVV344 251028.521 157 Stu.RASNZ active PAVV548 251028.519 143 Stu.RASNZ outburst PEGHX 251028.499 132 Stu.RASNZ active PSATY 251028.622 136 Stu.RASNZ active PUPUY 251028.658 147 Stu.RASNZ active PUPBV 251028.656 144 Stu.RASNZ active PUPHO 251028.660 139 Stu.RASNZ active TRADV 251028.465 139 Stu.RASNZ active VOLSY 251028.687 162 Stu.RASNZ outburst ASASSN-14GR 251028.597 146 Stu.RASNZ outburst NSV 11274 251028.470 150 Stu.RASNZ outburst DDE 76 251028.596 140 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 31571] Outbursts 27/10/2024
by Rod Stubbings 28 Oct '25

28 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks AQLUU 251027.480 120 Stu.RASNZ active ARAV793 251027.460 144 Stu.RASNZ active CAROY 251027.582 123 Stu.RASNZ active CETFZ 251027.417 130 Stu.RASNZ active CHAST 251027.587 143 Stu.RASNZ active CMAWZ 251027.627 144 Stu.RASNZ active CMADM 251027.622 148 Stu.RASNZ active CMAHL 251027.621 119 Stu.RASNZ active CMISV 251027.642 132 Stu.RASNZ outburst CRABP 251027.476 140 Stu.RASNZ outburst ERIPS 251027.468 128 Stu.RASNZ active HYIWX 251027.412 136 Stu.RASNZ outburst HYIDR 251027.411 154 Stu.RASNZ outburst MENAD 251027.498 145 Stu.RASNZ active NORIK 251027.428 155 Stu.RASNZ active OCTAO 251027.594 154 Stu.RASNZ outburst OCTBE 251027.590 158 Stu.RASNZ active ORIBI 251027.619 154 Stu.RASNZ active ORICN 251027.620 127 Stu.RASNZ active ORIV1159 251027.618 145 Stu.RASNZ outburst PAVV344 251027.505 155 Stu.RASNZ active PEGHX 251027.491 132 Stu.RASNZ active PSATY 251027.596 128 Stu.RASNZ outburst PUPUY 251027.639 146 Stu.RASNZ active PUPBV 251027.633 141 Stu.RASNZ outburst PUPHO 251027.641 139 Stu.RASNZ active SCOV478 251027.453 154 Stu.RASNZ active TRADV 251027.472 130 Stu.RASNZ active TUCVW 251027.593 159 Stu.RASNZ outburst DDE 76 251027.567 138 Stu.RASNZ active DDE 77 251027.470 141 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 31570] Outbursts 24/10/2025
by Rod Stubbings 24 Oct '25

24 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks AQLUU 251024.494 115 Stu.RASNZ outburst AQLFO 251024.430 140 Stu.RASNZ outburst ARAV793 251024.457 154 Stu.RASNZ outburst CAROY 251024.540 120 Stu.RASNZ outburst CETFZ 251024.471 127 Stu.RASNZ outburst CHAST 251024.544 142 Stu.RASNZ outburst CMAWZ 251024.590 142 Stu.RASNZ active CMADM 251024.594 148 Stu.RASNZ outburst CMAHL 251024.588 120 Stu.RASNZ outburst CRAV728 251024.464 152 Stu.RASNZ outburst ERILT 251024.549 154 Stu.RASNZ active ERIPS 251024.417 128 Stu.RASNZ outburst MENAD 251024.480 143 Stu.RASNZ outburst NORIK 251024.445 135 Stu.RASNZ active OCTBE 251024.532 157 Stu.RASNZ outburst ORIBI 251024.592 142 Stu.RASNZ outburst ORICN 251024.592 129 Stu.RASNZ outburst PAVGS 251024.524 150 Stu.RASNZ outburst PAVV344 251024.514 153 Stu.RASNZ outburst PEGHX 251024.506 132 Stu.RASNZ outburst SCOV478 251024.462 154 Stu.RASNZ active SGRV729 251024.492 152 Stu.RASNZ outburst TRADV 251024.450 126 Stu.RASNZ outburst TUCVW 251024.535 157 Stu.RASNZ outburst ASASSN-14FF 251024.549 154 Stu.RASNZ outburst ASASSN-14IS 251024.455 152 Stu.RASNZ outburst NSV 35 251024.533 155 Stu.RASNZ active DDE 76 251024.558 138 Stu.RASNZ active SSS 100511:061754-362655 251024.553 150 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 31569] TCP J20522886+1637203: a likely new WZ Sge-type dwarf nova
by tonny.vanmunster＠gmail.com 19 Oct '25

19 Oct '25

Dear colleagues, TCP J20522886+1637203 was discovered by XOSS (Xingming Observatory Sky Survey) on 2025 Oct 08.6 at mag 12.73 CV. The quiescent counterpart is a 22.1 r mag object, implying an outburst amplitude of ~9 mag. I have been observing this object on a very regular basis since Oct 08th with no periodic modulations visible in the light curves - until last night (Oct 17/18). I have just completed the analysis of my unfiltered CCD observations of TCP J20522886+1637203, obtained on 2025 Oct 17/18 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. The light curve now shows clear ordinary superhumps with an amplitude of 0.20 mag. Given their late onset (9 dyas after detection) and the large outburst amplitude, we conclude that TCP J20522886+1637203 is a new WZ Sge-type dwarf nova. A period analysis, using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0567 +/- 0.0004d. The object was measured at mag CV = 15.0 on Oct 18th. Image calibration and photometry were performed with the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars within the same frames. Continued monitoring is strongly encouraged to study the superhump profile and 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 31568] Outbursts 17/10/2025
by Rod Stubbings 18 Oct '25

18 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARAV877 251017.518 142 Stu.RASNZ active CAPSY 251017.524 135 Stu.RASNZ outburst CAROQ 251017.559 140 Stu.RASNZ outburst CHAST 251017.610 143 Stu.RASNZ active CMAWZ 251017.662 155 Stu.RASNZ outburst CMADM 251017.657 152 Stu.RASNZ active DELEZ 251017.419 152 Stu.RASNZ active ERICK 251017.405 134 Stu.RASNZ active ERILT 251017.624 156 Stu.RASNZ outburst HYIDR 251017.406 156 Stu.RASNZ active HYIVW 251017.556 104 Stu.RASNZ active NORHP 251017.506 138 Stu.RASNZ active NORIK 251017.506 139 Stu.RASNZ outburst PEGRU 251017.424 114 Stu.RASNZ active PUPUY 251017.681 140 Stu.RASNZ active PUPCL 251017.680 144 Stu.RASNZ active PUPHO 251017.683 142 Stu.RASNZ active PYXVZ 251017.687 120 Stu.RASNZ active SCOV598 251017.415 152 Stu.RASNZ active SGRV730 251017.496 151 Stu.RASNZ outburst TELKK 251017.549 149 Stu.RASNZ outburst ASASSN-14IS 251017.550 154 Stu.RASNZ outburst ASASSN-14JE 251017.618 162 Stu.RASNZ outburst ASASSN-18FP 251017.409 138 Stu.RASNZ outburst NSV 11274 251017.521 141 Stu.RASNZ active DDE 76 251017.619 139 Stu.RASNZ outburst DDE 77 251017.538 140 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 31567] Outbursts 14/10/2025
by Rod Stubbings 15 Oct '25

15 Oct '25

Outbursts and selected activity observed. object YYMMDD(UT) mag code remarks APSV394 251014.508 156 Stu.RASNZ outburst ARABF 251014.459 141 Stu.RASNZ active ARAV793 251014.463 152 Stu.RASNZ active ARAV877 251014.483 143 Stu.RASNZ outburst CHAST 251014.602 142 Stu.RASNZ active CMADM 251014.636 148 Stu.RASNZ outburst CMAHL 251014.635 124 Stu.RASNZ active CRABP 251014.501 144 Stu.RASNZ outburst DELEZ 251014.440 150 Stu.RASNZ outburst ERICK 251014.406 134 Stu.RASNZ active ERIPS 251014.471 132 Stu.RASNZ active HYIDR 251014.407 151 Stu.RASNZ active NORHP 251014.448 132 Stu.RASNZ active PEGHX 251014.549 132 Stu.RASNZ active PUPUY 251014.651 144 Stu.RASNZ outburst PUPCL 251014.643 154 Stu.RASNZ outburst PUPHO 251014.661 140 Stu.RASNZ outburst PYXVZ 251014.668 122 Stu.RASNZ outburst SCOV478 251014.452 154 Stu.RASNZ active SGRV551 251014.457 150 Stu.RASNZ active TRADV 251014.482 150 Stu.RASNZ active NSV 11274 251014.496 140 Stu.RASNZ active DDE 77 251014.473 141 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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