vsnet-alert June 2025

vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp

2 participants
4 discussions

[vsnet-alert 28073] 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-alert 28072] 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-alert 28071] V905 Sco (LBV) Recent Brightening
by Peter Williams 03 Jun '25

03 Jun '25

The bright LBV star V905 Sco is classified as either SDOR or ACYG type. A fading of this star was reported in vsnet-alert 15793 of 04 June 2013. V905 Sco now appears to be recovering from that decline as shown by the below recent visual observations: SCOV905 20240613.434 69 WPX SCOV905 20240713.560 70 WPX SCOV905 20240722.471 69 WPX SCOV905 20240811.411 70 WPX SCOV905 20240904.409 69 WPX SCOV905 20241026.424 69 WPX SCOV905 20241027.452 68 WPX SCOV905 20250402.759 69 WPX SCOV905 20250503.506 69 WPX SCOV905 20250527.825 63 WPX SCOV905 20250531.392 63 WPX SCOV905 20250601.430 63 WPX Tks and regards Peter Williams Heathcote NSW 10x50mm binoculars

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[vsnet-alert 28070] 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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vsnet-alert June 2025