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

[vsnet-outburst 31530] ASASSN-25cu: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 29 Jun '25

29 Jun '25

Dear colleagues, I have just completed the analysis of my unfiltered CCD observations of ASASSN-25cu, obtained on Jun 27/28 and 28/29, 2025 at CBA Belgium Observatory. The data was collected using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.25 mag, establishing ASASSN-25cu as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0536 +/- 0.0014d. The object was measured at mag CV = 15.7 on Jun 29th. Image calibration and photometry were performed using the latest release of Phoranso. Further observations are encouraged to refine the superhump period. 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 31529] Activity June 27-29
by Laslo Kočmaroš 29 Jun '25

29 Jun '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Observer code: KLO (AAVSO) Object YYYYMMDD Mag Obs_code Comment ANDRX 20250629.064 12.0 KLO Active AQLFO 20250627.949 <14.6 KLO AQLFO 20250628.914 13.9 KLO Outburst CYG1504 20250628.926 14.3 KLO Active CYGEM 20250628.922 12.3 KLO Active CYGSS 20250627.990 9.4 KLO Active CYGSS 20250628.933 9.1 KLO Active DRAEX 20250628.869 13.2 KLO Outburst HERAH 20250627.933 12.5 KLO Active HERAH 20250628.881 11.9 KLO Active LYRCY 20250627.955 <14.2 KLO LYRCY 20250628.909 <14.2 KLO OPHV426 20250627.937 13.0 KLO OPHV426 20250628.884 12.5 KLO Active PEGV537 20250629.053 13.2 KLO Active VULVW 20250628.946 14.7 KLO Regards, Laszlo Kocsmaros

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[vsnet-outburst 31528] Activity 26/27-06-2025
by Laslo Kočmaroš 27 Jun '25

27 Jun '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Observer code: KLO (AAVSO) Object YYYYMMDD Mag Obs_code Comment BOOCR 20250626.849 <13.9 KLO BOOUZ 20250626.851 <14.3 KLO BOOTT 20250626.853 <14.3 KLO DRADO 20250626.863 14.6 KLO DRAEX 20250626.867 14.4 KLO UMACH 20250626.874 <13.7 KLO CRBT 20250626.876 <9.8 KLO SERQW 20250626.883 <14.4 KLO SERQZ 20250626.885 <14.1 KLO HERV592 20250626.965 <14.5 KLO HERAH 20250626.967 12.8 KLO Rising OPHV426 20250626.969 13.3 KLO AQLKX 20250626.970 <14.0 KLO AQLFO 20250626.974 <13.9 KLO LYRLL 20250626.976 <14.3 KLO LYRAY 20250626.976 <14.5 KLO LYRCY 20250626.978 13.7 KLO Active LYRV344 20250626.988 <14.4 KLO CYGSS 20250626.993 10.0 KLO Active CYGV632 20250626.994 <14.3 KLO CYGV503 20250626.998 <14.2 KLO CYGV516 20250627.001 <14.2 KLO CYG1504 20250627.003 <14.5 KLO CYGEM 20250627.004 12.9 KLO Active SGERZ 20250627.005 <14.4 KLO VULVW 20250627.010 13.6 KLO Active CYGV1028 20250627.015 <14.4 KLO MISV1448 20250627.017 <14.2 KLO DRAAB 20250627.026 <13.8 KLO PEGRU 20250627.027 12.7 KLO ANDRX 20250627.030 13.0 KLO Active PEGEF 20250627.033 <14.4 KLO PEGV537 20250627.038 12.7 KLO Active PEGV513 20250627.041 <14.6 KLO PEGV521 20250627.044 <14.4 KLO PEGIP 20250627.050 <13.9 KLO Regards, Laszlo Kocsmaros

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[vsnet-outburst 31527] Recent outbursts
by Rod Stubbings 24 Jun '25

24 Jun '25

Recent outbursts the past few nights. object YYMMDD(UT) mag code remarks AQLUU 250620.569 124 Stu.RASNZ outburst AQLUU 250621.561 129 Stu.RASNZ ARAV793 250619.402 148 Stu.RASNZ outburst ARAV793 250620.374 148 Stu.RASNZ ARAV793 250621.432 148 Stu.RASNZ ARAV793 250623.362 147 Stu.RASNZ CAROQ 250623.403 142 Stu.RASNZ outburst CENV342 250619.478 144 Stu.RASNZ outburst CENV342 250620.578 144 Stu.RASNZ CENV342 250621.494 149 Stu.RASNZ CENV803 250620.583 143 Stu.RASNZ outburst CENV803 250621.576 143 Stu.RASNZ CHAST 250619.450 143 Stu.RASNZ active CHAST 250620.574 143 Stu.RASNZ CHAST 250621.596 143 Stu.RASNZ CHAST 250623.408 143 Stu.RASNZ ERICK 250620.624 142 Stu.RASNZ outburst HYAV392 250619.454 145 Stu.RASNZ outburst HYAV392 250620.451 144 Stu.RASNZ HYAV392 250621.476 143 Stu.RASNZ HYAV745 250620.400 142 Stu.RASNZ outburst HYAV745 250621.425 158 Stu.RASNZ HYIWX 250620.626 140 Stu.RASNZ outburst HYIWX 250621.603 146 Stu.RASNZ HYIDR 250620.625 152 Stu.RASNZ outburst HYIVW 250619.393 97 Stu.RASNZ active HYIVW 250620.378 97 Stu.RASNZ HYIVW 250621.412 95 Stu.RASNZ HYIVW 250623.356 100 Stu.RASNZ INDTU 250619.492 143 Stu.RASNZ outburst INDTU 250620.565 143 Stu.RASNZ INDTU 250621.557 144 Stu.RASNZ LEOX 250619.378 143 Stu.RASNZ outburst LEOX 250620.391 150 Stu.RASNZ MENAD 250619.396 144 Stu.RASNZ outburst MENAD 250620.383 144 Stu.RASNZ MENAD 250621.417 146 Stu.RASNZ MUSDQ 250621.569 150 Stu.RASNZ outburst NORHP 250619.416 127 Stu.RASNZ outburst NORHP 250620.369 128 Stu.RASNZ PAVGS 250620.562 154 Stu.RASNZ outburst PUPBV 250623.360 140 Stu.RASNZ outburst PUPBX 250619.385 142 Stu.RASNZ outburst PUPBX 250620.396 146 Stu.RASNZ PYXVZ 250619.388 122 Stu.RASNZ outburst PYXVZ 250620.390 122 Stu.RASNZ PYXVZ 250621.405 124 Stu.RASNZ PYXVZ 250623.385 123 Stu.RASNZ SCODV 250620.417 150 Stu.RASNZ outburst SCODV 250621.436 146 Stu.RASNZ SCODV 250623.392 154 Stu.RASNZ SCOV478 250619.464 150 Stu.RASNZ active SCOV478 250620.415 153 Stu.RASNZ SCOV598 250621.428 149 Stu.RASNZ SCOV598 250623.364 153 Stu.RASNZ outburst SERUZ 250619.476 148 Stu.RASNZ outburst SERUZ 250620.449 155 Stu.RASNZ TRADV 250620.360 132 Stu.RASNZ outburst VIRTW 250619.457 128 Stu.RASNZ outburst VIRTW 250621.478 128 Stu.RASNZ VOLRX 250623.405 148 Stu.RASNZ outburst VOLSY 250621.443 146 Stu.RASNZ outburst ASASSN-16BT 250620.405 138 Stu.RASNZ outburst ASASSN-16BT 250621.403 138 Stu.RASNZ ASASSN-16BT 250623.387 140 Stu.RASNZ ASASSN-19CT 250619.482 142 Stu.RASNZ outburst NSV 11274 250619.431 155 Stu.RASNZ NSV 11274 250620.433 157 Stu.RASNZ NSV 11274 250623.396 148 Stu.RASNZ outburst LMC V3434 250623.357 146 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 31526] Activity 21/22-06-2025
by Laslo Kočmaroš 22 Jun '25

22 Jun '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Observer code: KLO (AAVSO) Object YYYYMMDD Mag Obs_code Comment ANDRX 20250622.069 12.7 KLO Active AQLFO 20250621.956 <13.9 KLO AQLKX 20250621.943 <14.0 KLO BOOCR 20250621.869 14.1 KLO Active BOOTT 20250621.883 <14.3 KLO BOOUZ 20250621.882 <14.3 KLO CRBT 20250621.885 <9.8 KLO CYGEM 20250622.049 12.6 KLO Active CYGSS 20250622.043 11.1 KLO Active CYGV632 20250622.047 <14.3 KLO DRAAB 20250622.017 <13.8 KLO DRADO 20250621.890 <14.3 KLO DRAEX 20250621.895 <14.5 KLO HERAH 20250621.909 14.4 KLO HERV592 20250621.907 <14.5 KLO HERV844 20250621.913 13.3 KLO Active LYRAY 20250621.927 <14.5 KLO LYRCY 20250621.928 <14.2 KLO LYRLL 20250621.926 <14.3 KLO LYRV344 20250621.935 <14.4 KLO OPHRS 20250621.919 11.8 KLO OPHV426 20250621.916 12.5 KLO Active PEGEF 20250622.035 <14.4 KLO PEGRU 20250622.033 12.7 KLO PEGV513 20250622.024 <14.6 KLO PEGV521 20250622.031 14.3 KLO Active PEGV537 20250622.022 12.6 KLO Active SERQW 20250621.900 <14.4 KLO SERQZ 20250621.903 <14.1 KLO UMACH 20250621.893 <14.2 KLO Regards, Laszlo Kocsmaros

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[vsnet-outburst 31525] Activity 19/20-06-2025
by Laslo Kočmaroš 20 Jun '25

20 Jun '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Object YYYYMMDD Mag Observer AQLKX 20250619.997 <14.0 Laszlo Kocsmaros BOOCR 20250619.865 <14.2 Laszlo Kocsmaros BOOTT 20250619.874 <14.3 Laszlo Kocsmaros BOOUZ 20250619.873 <14.3 Laszlo Kocsmaros CRBT 20250619.878 <9.3 Laszlo Kocsmaros CYG1504 20250620.003 <14.5 Laszlo Kocsmaros CYGEM 20250620.004 13.0 Laszlo Kocsmaros DRADO 20250619.888 <14.3 Laszlo Kocsmaros DRAEX 20250619.895 <14.3 Laszlo Kocsmaros HERAH 20250619.911 14.3 Laszlo Kocsmaros HERV592 20250619.907 <14.5 Laszlo Kocsmaros HERV844 20250619.913 <14.1 Laszlo Kocsmaros LYRAY 20250619.973 <14.5 Laszlo Kocsmaros LYRCY 20250619.974 <14.2 Laszlo Kocsmaros LYRLL 20250619.969 <14.3 Laszlo Kocsmaros LYRV344 20250619.981 <14.0 Laszlo Kocsmaros OPHRS 20250619.967 11.8 Laszlo Kocsmaros OPHV426 20250619.915 12.0 Laszlo Kocsmaros SERQW 20250619.902 <14.4 Laszlo Kocsmaros SERQZ 20250619.904 <14.1 Laszlo Kocsmaros UMACH 20250619.892 <14.2 Laszlo Kocsmaros VIRHV 20250619.870 <14.1 Laszlo Kocsmaros Regards, Laszlo Kocsmaros

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[vsnet-outburst 31524] Outbursts 12-13/ 06/ 2025
by Rod Stubbings 13 Jun '25

13 Jun '25

Outbursts and selected activity observed. object YYMMDD(UT) mag code remarks AQLFO 250613.561 137 Stu.RASNZ outburst CAROQ 250612.401 146 Stu.RASNZ active CENV373 250613.552 144 Stu.RASNZ outburst CENV803 250613.558 143 Stu.RASNZ outburst CHAST 250612.404 143 Stu.RASNZ active CHAST 250613.410 143 Stu.RASNZ active CMADM 250613.358 130 Stu.RASNZ outburst HYIVW 250612.370 98 Stu.RASNZ outburst HYIVW 250613.368 103 Stu.RASNZ active MENAD 250612.374 140 Stu.RASNZ outburst MENAD 250613.371 140 Stu.RASNZ active PICAR 250612.367 140 Stu.RASNZ active PUPBV 250612.357 140 Stu.RASNZ outburst PUPBV 250613.365 141 Stu.RASNZ active PUPHO 250613.364 140 Stu.RASNZ active SCOV893 250612.385 114 Stu.RASNZ outburst SCOV893 250613.381 116 Stu.RASNZ active TRADV 250613.351 130 Stu.RASNZ outburst DDE 76 250612.368 141 Stu.RASNZ outburst DDE 76 250613.394 141 Stu.RASNZ active MASTER OT J142023.47-485540.0 250613.403 139 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 31523] PNV J06302516-6955014: classical nova
by Yusuke Tampo 06 Jun '25

06 Jun '25

PNV J06302516-6955014: classical nova I reported the optical spectrum of PNV J06302516-6955014 to ATel and classified it as a classical nova. https://www.astronomerstelegram.org/?read=17224 ASAS-SN also detected its rise on 2025-06-04. https://asas-sn.osu.edu/sky-patrol/coordinate/0f0a542e-3695-45e3-95d4-cabe9… 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 31522] Activity (2025-06-04)
by Hiroyuki Maehara 04 Jun '25

04 Jun '25

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code HERAH 20250604.542 130 Mhh.VSOLJ LYRAY 20250604.546 140 Mhh.VSOLJ UMASW 20250604.508 114 Mhh.VSOLJ Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

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[vsnet-outburst 31521] Outbursts 3-4 /06/2025
by Rod Stubbings 04 Jun '25

04 Jun '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks AQLDH 250604.571 127 Stu.RASNZ outburst AQLFO 250604.572 154 Stu.RASNZ active ARABF 250603.409 146 Stu.RASNZ outburst ARABF 250604.440 150 Stu.RASNZ active CAROQ 250603.405 144 Stu.RASNZ outburst CAROQ 250604.535 143 Stu.RASNZ active CENNN 250604.582 153 Stu.RASNZ active CENV342 250604.544 156 Stu.RASNZ active CENV485 250604.590 144 Stu.RASNZ superoutburst CHAST 250603.417 143 Stu.RASNZ active CHAST 250604.544 143 Stu.RASNZ active CMAHL 250603.379 116 Stu.RASNZ active INDTU 250604.559 143 Stu.RASNZ outburst MICCM 250604.560 149 Stu.RASNZ active OCTDT 250603.419 134 Stu.RASNZ superoutburst PICAR 250603.399 130 Stu.RASNZ outburst PICAR 250604.456 132 Stu.RASNZ active PUPBX 250603.385 142 Stu.RASNZ outburst PUPBX 250604.417 145 Stu.RASNZ active SCOV598 250603.410 153 Stu.RASNZ outburst SCOV598 250604.412 147 Stu.RASNZ active TRADV 250603.363 132 Stu.RASNZ outburst TRADV 250604.433 137 Stu.RASNZ active VIRQZ 250603.384 144 Stu.RASNZ active NSV 11274 250604.456 147 Stu.RASNZ outburst CRTS J124507.8-381322 250604.587 130 Stu.RASNZ active MASTER OT J142023.47-485540.0 250604.426 128 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 June 2025