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

[vsnet-outburst 31615] Outbursts 10/01/2026
by Rod Stubbings 11 Jan '26

11 Jan '26

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CMADM 260110.478 142 Stu.RASNZ outburst CMAHL 260110.477 118 Stu.RASNZ active ORIBI 260110.490 160 Stu.RASNZ active ORICN 260110.491 131 Stu.RASNZ active ORIV1159 260110.489 128 Stu.RASNZ active PSATY 260110.462 131 Stu.RASNZ outburst PUPUY 260110.526 138 Stu.RASNZ active PUPBV 260110.524 130 Stu.RASNZ active PUPCL 260110.525 145 Stu.RASNZ outburst PUPHO 260110.528 143 Stu.RASNZ active ASASSN-19CT 260110.591 144 Stu.RASNZ outburst DDE 76 260110.470 139 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 31609] ASASSN-25fj; new SU UMa-type dwarf nova, most likely WZ Sge subtype
by Yusuke Tampo 11 Jan '26

11 Jan '26

ASASSN-25fj; new SU UMa-type dwarf nova, most likely WZ Sge type ASASSN reported the discovery of ASASSN-25fj on 2026-01-1.19 UT. The observed maximum was approximately at 12.2 mag on 2025-12-25.0 UT according to ASASSN. https://asas-sn.osu.edu/sky-patrol/coordinate/ec92b0f6-1377-450b-b464-7fbe3… The likely counterpart is GALEX J050001.2-571430 (NUV=21.5(2) mag) and DES J050001.26-571430.1 (g=21.278(9) mag). Thus the outburst amplitude is ~9mag. Lesedi telescope at the SAAO and Josch Hambsch have reported the time-resolved observations of ASASSN-25fj. Its light curve after 2026-01-03 shows single-peaked ordinary superhumps with a period of ~0.0556 d and an amplitude of > 0.1 mag. Hence, ASASSN-25fj is a new SU UMa-type dwarf nova. Given its large outburst amplitude and short superhump period, it most likely belongs to the WZ Sge subtype. Continuous 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 31613] Recent outbursts 5,6/01/2026
by Rod Stubbings 09 Jan '26

09 Jan '26

Recent outbursts on 5,6/01/2026 object YYMMDD(UT) mag code remarks CAROQ 260105.469 138 Stu.RASNZ outburst CAROQ 260106.506 138 Stu.RASNZ CHAZ 260106.542 140 Stu.RASNZ outburst CHAZ 260106.633 136 Stu.RASNZ CHAST 260105.506 140 Stu.RASNZ outburst ORIBI 260106.483 143 Stu.RASNZ outburst ORICN 260105.495 129 Stu.RASNZ active ORICN 260106.485 128 Stu.RASNZ active ORIV1159 260106.483 140 Stu.RASNZ outburst ORIV1159 260106.636 137 Stu.RASNZ PUPUY 260105.484 144 Stu.RASNZ outburst PUPUY 260106.501 141 Stu.RASNZ PUPBV 260105.487 136 Stu.RASNZ outburst PUPBV 260106.497 138 Stu.RASNZ PUPBX 260105.487 149 Stu.RASNZ outburst PUPBX 260106.496 148 Stu.RASNZ PUPHO 260106.503 143 Stu.RASNZ active TRAEK 260105.541 126 Stu.RASNZ active TRAEK 260106.623 138 Stu.RASNZ active TUCVW 260106.517 158 Stu.RASNZ outburst ASASSN-19CT 260106.617 151 Stu.RASNZ outburst NSV 35 260106.516 149 Stu.RASNZ outburst DDE 77 260106.635 138 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 31612] Activity (2026-01-08)
by Hiroyuki Maehara 08 Jan '26

08 Jan '26

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code CMAHL 20260108.582 133 Mhh.VSOLJ outburst ERIIM 20260108.563 118 Mhh.VSOLJ ORICN 20260108.581 121 Mhh.VSOLJ ORIV1159 20260108.579 128 Mhh.VSOLJ outburst VIRHV 20260108.769 123 Mhh.VSOLJ Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

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[vsnet-outburst 31607] Outbursts 28/12/2025
by Rod Stubbings 29 Dec '25

29 Dec '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CENMU 251228.646 141 Stu.RASNZ outburst CENV342 251228.639 154 Stu.RASNZ outburst CENV442 251228.642 135 Stu.RASNZ active CENV485 251228.684 153 Stu.RASNZ active CHAST 251228.658 142 Stu.RASNZ active CMAWZ 251228.507 147 Stu.RASNZ active CMAHL 251228.512 120 Stu.RASNZ active CNCGZ 251228.634 130 Stu.RASNZ active CRTBF 251228.641 147 Stu.RASNZ outburst ERICK 251228.617 132 Stu.RASNZ active ERILT 251228.524 156 Stu.RASNZ active HYAV495 251228.633 145 Stu.RASNZ active MONCW 251228.533 128 Stu.RASNZ active OCTAA 251228.662 148 Stu.RASNZ outburst ORICN 251228.531 146 Stu.RASNZ active ORIV1159 251228.528 140 Stu.RASNZ outburst PAVV548 251228.489 143 Stu.RASNZ outburst PUPCL 251228.519 143 Stu.RASNZ active PUPHO 251228.523 143 Stu.RASNZ active TRADV 251228.692 134 Stu.RASNZ active TRAEK 251228.688 114 Stu.RASNZ active VELV383 251228.637 136 Stu.RASNZ active VIRTW 251228.649 129 Stu.RASNZ active ASASSN-19CT 251228.646 155 Stu.RASNZ active NSV 35 251228.663 152 Stu.RASNZ active SSS 100511:061754-362655 251228.497 154 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 31606] Outbursts 27/12/2025
by Rod Stubbings 28 Dec '25

28 Dec '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CENV442 251227.655 132 Stu.RASNZ active CENV485 251227.665 152 Stu.RASNZ outburst CHAST 251227.517 136 Stu.RASNZ outburst CMAWZ 251227.502 148 Stu.RASNZ active CMADM 251227.497 153 Stu.RASNZ active CMAHL 251227.496 119 Stu.RASNZ active CNCSY 251227.706 128 Stu.RASNZ active CNCGZ 251227.652 133 Stu.RASNZ active ERICK 251227.626 132 Stu.RASNZ active ERILT 251227.532 153 Stu.RASNZ active ERIPS 251227.631 127 Stu.RASNZ active HYAV495 251227.651 146 Stu.RASNZ active HYIVW 251227.671 105 Stu.RASNZ active INDTU 251227.483 143 Stu.RASNZ outburst LEOX 251227.702 148 Stu.RASNZ active MONCW 251227.544 128 Stu.RASNZ outburst ORICN 251227.539 139 Stu.RASNZ active PUPCL 251227.527 147 Stu.RASNZ outburst PUPHO 251227.531 143 Stu.RASNZ active TRADV 251227.697 132 Stu.RASNZ active TRAEK 251227.694 112 Stu.RASNZ active VELV383 251227.621 134 Stu.RASNZ active VIRTW 251227.688 132 Stu.RASNZ active ASASSN-14GR 251227.467 151 Stu.RASNZ outburst ASASSN-19CT 251227.658 154 Stu.RASNZ active NSV 35 251227.519 150 Stu.RASNZ outburst SSS 100511:061754-362655 251227.467 152 Stu.RASNZ active MASTER OT J142023.47-485540.0 251227.700 130 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 31605] TCP J16425922+2621020: a large amplitude CV candidate, likely a WZ Sge-type dwarf nova
by Yusuke Tampo 27 Dec '25

27 Dec '25

TCP J16425922+2621020: a large amplitude CV candidate, likely a WZ Sge-type dwarf nova Tadashi Kojima reported the discovery of TCP J16425922+2621020 on 2025 12 26.8538 UTC at 13.0 mag (unfiltered). http://www.cbat.eps.harvard.edu/unconf/followups/J16425922+2621020.html The likely counterpart is 3"-away Gaia DR3 1301247792154799488, G=20.044(8) mag at 674 (-144/+248) pc. Thus, the absolute magnitudes in quiescence and outburst are ~10.9(7) and ~3.9(7) mag, respectively. This is also recorded in the Gaia white dwarf candidate catalogs (e.g., Gentile et al. 2021). http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_… Given its large outburst amplitude of ~7 mag, no previous outbursts, and possible white dwarf-dominated spectral energy distribution in quiescence, TCP J16425922+2621020 is most likely a WZ Sge-type dwarf nova in outburst. Although time-resolved observations are almost impossible for now due to its RA=16hr, this might be a nice target for future observations. 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 31604] outbursts 26/12/2025
by Rod Stubbings 27 Dec '25

27 Dec '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CENV442 251226.669 131 Stu.RASNZ outburst CNCGZ 251226.726 132 Stu.RASNZ outburst ERICK 251226.604 132 Stu.RASNZ outburst ERILT 251226.608 154 Stu.RASNZ outburst ERIPS 251226.657 128 Stu.RASNZ outburst HYAV495 251226.696 154 Stu.RASNZ outburst HYIWX 251226.606 140 Stu.RASNZ outburst HYIVW 251226.694 102 Stu.RASNZ outburst LEOX 251226.696 138 Stu.RASNZ active MENAD 251226.660 153 Stu.RASNZ outburst ORICN 251226.615 134 Stu.RASNZ active TRADV 251226.721 131 Stu.RASNZ outburst TRAEK 251226.715 116 Stu.RASNZ outburst VELV383 251226.632 130 Stu.RASNZ outburst VIRTW 251226.699 132 Stu.RASNZ outburst ASASSN-19CT 251226.674 142 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 31603] Outbursts 22,23/12/2025
by Rod Stubbings 24 Dec '25

24 Dec '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARAV793 251222.481 147 Stu.RASNZ outburst CAROQ 251222.533 148 Stu.RASNZ active CAROQ 251223.499 146 Stu.RASNZ active CMAWZ 251222.506 155 Stu.RASNZ outburst CMADM 251223.502 147 Stu.RASNZ outburst CMAHL 251223.501 119 Stu.RASNZ outburst INDTT 251222.515 154 Stu.RASNZ active PAVGS 251222.518 150 Stu.RASNZ outburst PEGHX 251222.477 131 Stu.RASNZ outburst PUPBV 251222.507 143 Stu.RASNZ active PUPBX 251222.506 155 Stu.RASNZ active PUPHO 251222.542 140 Stu.RASNZ active VOLSY 251222.532 160 Stu.RASNZ active ASASSN-14FF 251222.494 150 Stu.RASNZ active DDE 76 251222.492 156 Stu.RASNZ outburst LMC V3434 251222.527 146 Stu.RASNZ outburst SSS 100511:061754-362655 251222.483 144 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 31602] HW Boo
by Gary Poyner 23 Dec '25

23 Dec '25

The UGSU star HW Boo is in bright outburst, possibly a superoutburst, the first one since March 2024... Dec 17.447 17.678V Dec 18.540 17.500V Dec 21.535 13.911V AAVSOnet DSO-35, Fort Davis, Texas. Gary -- ------------------------------------------------------ Gary Poyner FRAS garypoyner(a)gmail.com www.variablestars.co.uk

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