January 2026 - vsnet-outburst - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-outburst 31619] Activity (2026-01-16)
by Hiroyuki Maehara 16 Jan '26

16 Jan '26

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code AURSS 20260116.572 109 Mhh.VSOLJ CAMZ 20260116.582 113 Mhh.VSOLJ CMAHL 20260116.554 133 Mhh.VSOLJ ORICZ 20260116.552 136 Mhh.VSOLJ outburst Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

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[vsnet-outburst 31617] ASASSN-26ad; new SU UMa-type dwarf nova, likely a WZ Sge star
by Yusuke Tampo 15 Jan '26

15 Jan '26

ASASSN-26ad; new SU UMa-type dwarf nova, likely a WZ Sge star ASASSN-26ad was discovered by ASASSN on 2026-01-04.1 UT at 14.57 mag. The outburst amplitude is ~8.3 mag according to the VSX. https://vsx.aavso.org/index.php?view=detail.top&oid=10868368 Sjoerd Dufoer, Josch Hambsch, and Itoh-san have reported the time-resolved observations. Although there were some modulations from the early outburst, clear single-peaked superhumps have appeared after 2026-01-10. The mean superhump period is ~0.0618 d. Thus, ASASSN-26ad is a new SU UMa-type dwarf nova. Given its large outburst amplitude and long waiting time before the appearance of positive superhumps, ASASSN-26ad is likely a WZ Sge star. 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 31616] Outbursts 12/01/2026
by Rod Stubbings 13 Jan '26

13 Jan '26

Outbursts and selected activity. object YYMMDD(UT) mag code remarks CAROQ 260112.560 146 Stu.RASNZ active CHAST 260112.556 143 Stu.RASNZ active CMADM 260112.499 145 Stu.RASNZ active CMAHL 260112.498 119 Stu.RASNZ active CRTTT 260112.604 145 Stu.RASNZ outburst ERIPS 260112.537 128 Stu.RASNZ outburst HYIVW 260112.546 102 Stu.RASNZ outburst LEOX 260112.610 148 Stu.RASNZ outburst ORICN 260112.496 129 Stu.RASNZ active ORIV1159 260112.494 137 Stu.RASNZ active PUPUY 260112.509 140 Stu.RASNZ active PUPBV 260112.506 133 Stu.RASNZ active PUPCL 260112.507 143 Stu.RASNZ active PUPHO 260112.511 143 Stu.RASNZ active ASASSN-15CL 260112.510 155 Stu.RASNZ outburst ASASSN-19CT 260112.601 154 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 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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