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

[vsnet-outburst 31510] Activity (2025-05-25)
by Hiroyuki Maehara 25 May '25

25 May '25

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code HERAH 20250525.551 129 Mhh.VSOLJ UMASW 20250525.497 96 Mhh.VSOLJ Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

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[vsnet-outburst 31509] Outbursts 24/05/2025
by Rod Stubbings 25 May '25

25 May '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARABF 250524.496 151 Stu.RASNZ active ARAV793 250524.478 149 Stu.RASNZ outburst CAPSY 250524.593 146 Stu.RASNZ outburst CAROQ 250524.543 145 Stu.RASNZ active CENV342 250524.537 146 Stu.RASNZ outburst CENV436 250524.539 124 Stu.RASNZ outburst CENV442 250524.538 128 Stu.RASNZ outburst CHAZ 250524.585 150 Stu.RASNZ active CHAST 250524.588 142 Stu.RASNZ active HYAV392 250524.526 150 Stu.RASNZ outburst MICCM 250524.567 150 Stu.RASNZ active PAVGS 250524.561 154 Stu.RASNZ outburst SERUZ 250524.518 150 Stu.RASNZ outburst SGRV2276 250524.567 156 Stu.RASNZ outburst TRADV 250524.481 136 Stu.RASNZ outburst ASASSN-15BI 250524.506 153 Stu.RASNZ active ASASSN-20PV 250524.536 144 Stu.RASNZ outburst rebrightened! NSV 11274 250524.493 150 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 31508] ASASSN-25bu: new SU UMa-type dwarf nova
by Yusuke Tampo 23 May '25

23 May '25

ASASSN-25bu: new SU UMa-type dwarf nova ASASSN-25b was discovered by ASAS-SN on 2025-05-12.06. The outburst amplitude is ~8.3 mag according to the VSX. This object is currently ~17.5 mag. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848624 Josch Hambsch and the SAAO team have reported the time-seeries observations of ASASSN-25bu. Lesedi/Mookodi observations on 22 May showed probable superhumps with a period of ~0.0574 d and an amplitude of ~0.15 mag. Thus ASASSN-25bu is a new SU UMa-type dwarf nova. Considering its short superhump period, large outburst amplitude, and no previous outbursts, ASASSN-25bu might be a WZ Sge-type. 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-outburst 31507] Outbursts 20/05/2025
by Rod Stubbings 21 May '25

21 May '25

Outbursts and selected activity observed. object YYMMDD(UT) mag code remarks APSDT 250520.606 154 Stu.RASNZ outburst AQLFO 250520.634 153 Stu.RASNZ active AQLPQ 250520.638 150 Stu.RASNZ outburst AQLV1047 250520.639 150 Stu.RASNZ outburst ARABF 250520.515 146 Stu.RASNZ active CAROQ 250520.590 140 Stu.RASNZ active CENV803 250520.619 154 Stu.RASNZ outburst CENV803 250520.653 153 Stu.RASNZ active CHAZ 250520.592 132 Stu.RASNZ active CHAST 250520.595 143 Stu.RASNZ active CMAWZ 250520.402 150 Stu.RASNZ active CMAHL 250520.395 126 Stu.RASNZ active INDTU 250520.561 143 Stu.RASNZ outburst MICCM 250520.571 149 Stu.RASNZ outburst ORICN 250520.362 126 Stu.RASNZ active ORIV1159 250520.362 137 Stu.RASNZ outburst PUPUY 250520.399 146 Stu.RASNZ active PUPBX 250520.446 144 Stu.RASNZ outburst PUPHO 250520.401 145 Stu.RASNZ active SCOV478 250520.517 152 Stu.RASNZ active SCOV598 250520.419 153 Stu.RASNZ active SERUZ 250520.540 150 Stu.RASNZ active SGRV729 250520.559 154 Stu.RASNZ active ASASSN-14DW 250520.620 150 Stu.RASNZ outburst ASASSN-15BI 250520.441 147 Stu.RASNZ outburst ASASSN-15BI 250520.522 150 Stu.RASNZ active ASASSN-15CL 250520.401 147 Stu.RASNZ active NSV 11274 250520.531 146 Stu.RASNZ active DDE 76 250520.460 148 Stu.RASNZ outburst LMC V3434 250520.387 143 Stu.RASNZ outburst SSS 100511:061754-362655 250520.391 150 Stu.RASNZ active MASTER OT J142023.47-485540.0 250520.412 130 Stu.RASNZ active CTCVJ1940-4724 250520.542 140 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 31501] ZTF18acynctq = TCP J20402089+4915562 = ASASSN-25bt: new SU UMa star candidate
by Yusuke Tampo 20 May '25

20 May '25

ZTF18acynctq = TCP J20402089+4915562 = ASASSN-25bt: new SU UMa star candidate XOSS team via TOCP/TNS and ASAS-SN reported the 2025 outburst of this system, which is already known as ZTF18acynctq in its 2018 outburst. https://alerce.online/object/ZTF18acynctq http://www.cbat.eps.harvard.edu/unconf/followups/J20402089+4915562.html https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848612 Its 2018 outburst lasted for ~15 days and showed a possible rebrightening in the ATLAS data. Thus the outburst cycle is ~2300 d. This system is currently ~16.0 mag, and time-resolved observations may detect superhumps. 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-outburst 31500] Outbursts 19/05/25
by Rod Stubbings 20 May '25

20 May '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARABF 250519.456 142 Stu.RASNZ outburst CAROQ 250519.460 142 Stu.RASNZ outburst CHAZ 250519.463 128 Stu.RASNZ active CHAST 250519.466 143 Stu.RASNZ active CMAWZ 250519.399 150 Stu.RASNZ active CMAHL 250519.395 126 Stu.RASNZ active CRABP 250519.560 140 Stu.RASNZ outburst HYIDR 250519.361 151 Stu.RASNZ active NORHP 250519.420 150 Stu.RASNZ active NORIK 250519.421 157 Stu.RASNZ active ORICN 250519.359 126 Stu.RASNZ active PUPHO 250519.435 144 Stu.RASNZ active SCOFQ 250519.454 150 Stu.RASNZ active SCOV478 250519.458 151 Stu.RASNZ active SCOV598 250519.381 150 Stu.RASNZ active SGRV729 250519.563 150 Stu.RASNZ outburst VOLSY 250519.460 156 Stu.RASNZ active ASASSN-15CL 250519.435 141 Stu.RASNZ outburst NSV 11274 250519.484 150 Stu.RASNZ active SSS 100511:061754-362655 250519.392 156 Stu.RASNZ outburst MASTER OT J142023.47-485540.0 250519.382 129 Stu.RASNZ active CTCVJ1940-4724 250519.561 135 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 31499] Activity 17/18-05-2025
by Laslo Kočmaroš 18 May '25

18 May '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Object YYYYMMDD Mag Observer CAMZ 20250517.835 11.0 Laszlo Kocsmaros LEOHM 20250517.813 <13.5 Laszlo Kocsmaros LEOIU 20250517.824 12.8 Laszlo Kocsmaros LEOX 20250517.805 <13.8 Laszlo Kocsmaros LMISX 20250517.831 <14.2 Laszlo Kocsmaros SEXVZ 20250517.817 <13.7 Laszlo Kocsmaros UMASU 20250517.832 <14.1 Laszlo Kocsmaros VIRQZ 20250517.844 <14.1 Laszlo Kocsmaros VIRTW 20250517.847 <14.3 Laszlo Kocsmaros Regards, Laszlo Kocsmaros

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[vsnet-outburst 31498] Outbursts 17/05/2025
by Rod Stubbings 18 May '25

18 May '25

Outbursts observed. object YYMMDD(UT) mag code remarks AQLFO 250517.791 135 Stu.RASNZ outburst ERIPS 250517.806 128 Stu.RASNZ outburst HYIWX 250517.781 140 Stu.RASNZ outburst HYIDR 250517.781 151 Stu.RASNZ outburst NORHP 250517.770 146 Stu.RASNZ outburst NORIK 250517.771 146 Stu.RASNZ active SCOV598 250517.719 147 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 31497] Outbursts 13,14/05/2025
by Rod Stubbings 14 May '25

14 May '25

Recent outbursts and activity observed. object YYMMDD(UT) mag code remarks ARAAT 250514.526 138 Stu.RASNZ active CHAZ 250513.403 123 Stu.RASNZ active CHAZ 250514.371 127 Stu.RASNZ active CHAST 250513.404 143 Stu.RASNZ active CHAST 250514.425 143 Stu.RASNZ active CMAWZ 250513.397 148 Stu.RASNZ active CMAWZ 250514.357 147 Stu.RASNZ active CMAHL 250513.388 130 Stu.RASNZ active CMAHL 250514.353 130 Stu.RASNZ active ERICK 250514.351 145 Stu.RASNZ outburst LEOX 250513.367 136 Stu.RASNZ active LEOX 250514.342 150 Stu.RASNZ active NORIK 250514.430 137 Stu.RASNZ active ORICN 250513.360 137 Stu.RASNZ active ORICN 250514.371 128 Stu.RASNZ outburst ORIV1159 250513.359 138 Stu.RASNZ outburst PUPBV 250513.396 138 Stu.RASNZ active PUPBV 250514.359 140 Stu.RASNZ active PUPCL 250513.396 143 Stu.RASNZ active PUPCL 250514.360 142 Stu.RASNZ active PUPHO 250513.394 137 Stu.RASNZ active PUPHO 250514.363 139 Stu.RASNZ active PYXVZ 250514.419 138 Stu.RASNZ active TRADV 250513.409 130 Stu.RASNZ active TRADV 250514.427 130 Stu.RASNZ active VIRTW 250513.371 140 Stu.RASNZ active VIRTW 250514.366 138 Stu.RASNZ outburst VOLSY 250514.421 144 Stu.RASNZ active ASASSN-20PV 250514.528 128 Stu.RASNZ active DDE 76 250513.403 141 Stu.RASNZ outburst DDE 76 250514.370 144 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 31496] Outbursts 12/05/2025
by Rod Stubbings 12 May '25

12 May '25

Outbursts and selected activity observed. object YYMMDD(UT) mag code remarks ARAAT 250512.530 136 Stu.RASNZ outburst ARABF 250512.531 141 Stu.RASNZ active CENBV 250512.378 133 Stu.RASNZ CENV1040 250512.560 138 Stu.RASNZ active CMAWZ 250512.403 149 Stu.RASNZ active CMAHL 250512.399 124 Stu.RASNZ outburst HYIVW 250512.391 135 Stu.RASNZ LEOX 250512.373 126 Stu.RASNZ active PUPBV 250512.405 132 Stu.RASNZ active PUPBX 250512.404 153 Stu.RASNZ active PUPCL 250512.406 149 Stu.RASNZ outburst PUPHO 250512.408 137 Stu.RASNZ active PYXVZ 250512.542 124 Stu.RASNZ outburst TRADV 250512.383 130 Stu.RASNZ active VOLSY 250512.537 144 Stu.RASNZ active ASASSN-20PV 250512.581 127 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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