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

[vsnet-outburst 31520] Activity 03/04-06-2025
by Laslo Kočmaroš 04 Jun '25

04 Jun '25

Type of observation: Visual Instrument: Dobson 355/1650 Location: Zrenjanin, Serbia Object YYYYMMDD Mag Observer AQLKX 20250603.985 <14.0 Laszlo Kocsmaros BOOCR 20250603.817 <14.2 Laszlo Kocsmaros BOOTT 20250603.822 <14.3 Laszlo Kocsmaros BOOUZ 20250603.819 <14.3 Laszlo Kocsmaros CRBT 20250603.976 <9.8 Laszlo Kocsmaros CYG1504 20250604.017 <14.2 Laszlo Kocsmaros CYGEM 20250604.003 12.7 Laszlo Kocsmaros CYGSS 20250604.014 11.2 Laszlo Kocsmaros CYGV1028 20250604.023 <14.2 Laszlo Kocsmaros CYGV503 20250604.010 13.8 Laszlo Kocsmaros CYGV516 20250604.010 <14.2 Laszlo Kocsmaros CYGV632 20250604.015 <14.3 Laszlo Kocsmaros HERAH 20250603.844 12.6 Laszlo Kocsmaros HERV844 20250603.980 <14.1 Laszlo Kocsmaros LYRAY 20250603.835 13.6 Laszlo Kocsmaros LYRCY 20250603.935 <13.9 Laszlo Kocsmaros LYRLL 20250603.931 <14.2 Laszlo Kocsmaros MISV1448 20250604.026 <14.2 Laszlo Kocsmaros OPHV426 20250603.999 12.2 Laszlo Kocsmaros SGERZ 20250603.992 <14.4 Laszlo Kocsmaros VULVW 20250603.994 13.3 Laszlo Kocsmaros Regards, Laszlo Kocsmaros

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[vsnet-outburst 31519] TCP J20131357+1154031: new SU UMa-type dwarf nova, possibly WZ Sge-type
by Yusuke Tampo 03 Jun '25

03 Jun '25

TCP J20131357+1154031: new SU UMa-type dwarf nova, possibly WZ Sge-type K. Itagaki discovered TCP J20131357+1154031 on 2025-05-19 UTC at 14.7 mag (unfiltered). The outburst amplitude is ~8.4 mag. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848625 SAAO/Lesedi telescope, Josch Hambsch, and Sano-san have reported the time-resolved observations. Josch's observations after 28 May show single-peaked variation with a period of 0.05797(6) d, likely an ordinary superhump. No clear modulations were presented before this. Thus TCP J20131357+1154031 is a new SU UMa-type dwarf nova and a good candidate for a WZ Sge-type dwarf nova, given its late appearance of ordinary superhumps. 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 31518] ASASSN-25ce: new WZ Sge-type dwarf nova
by Yusuke Tampo 02 Jun '25

02 Jun '25

ASASSN-25ce: new WZ Sge-type dwarf nova ASAS-SN discovered ASASSN-25ce on 2025-05-28 UTC at 12.26 mag. The Gaia counterpart is G~20.7 mag thus the outburst amplitude is ~8.5 mag. The SAAO team and Berto Monard reported the time-resolved observations. These light curves show a double-peak modulation with an amplitude of ~0.1 mag and a period of ~0.05537(1) d. The 5-sec resolution observations by the SAAO/Lesedi telescope also show QPO-like modulation with 5--10 min. Hence, ASASSN-25ce is a new WZ Sge-type dwarf nova, possibly with a relatively higher inclination, while no clear eclipses are present. Further time-resolved 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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