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

[vsnet-alert 28081] ASASSN-25ci
by 保家大将 20 Jun '25

20 Jun '25

ASASSN-25ci: new SU UMa-type dwarf nova,and possibly WZ Sge-type ASAS-SN discovered ASASSN-25ci on 2025-06-5.31 UTC at g=13.51 mag. According to VSX, this object's quiescence magnitude is B~21.0 thus the outburst amplitude is ~7.5 mag. https://vsx.aavso.org/index.php?view=detail.top&oid=10848701 Berto Monard and Josch Hambsch reported the time-resolved observations. These light curves (after 2025-6-11 UTC) show ordinary superhumps with an amplitude of ~0.3 mag and a period of 0.0535(1)d. … [View More]

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[vsnet-alert 28074] ASASSN-25cm - 8.7 mag transient in Lupus
by Kirill Sokolovsky 17 Jun '25

17 Jun '25

The ASAS-SN team has posted a bright transient on the TNS: ASASSN-25cm = AT 2025nlr 15:08:03.274 -40:08:29.58 g=8.7 https://www.wis-tns.org/object/2025nlr with the following comment: "Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit". The extinction in this direction is relatively low A(V) = 0.345, so a typical classical nova peaking at absolute magnitude M_V= -7.0 at 8 kpc distance would rise to V=7.9.… [View More]

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[vsnet-alert 28076] Re: ASASSN-25cm - 8.7 mag transient in Lupus
by Mohammad Odeh 15 Jun '25

15 Jun '25

Greetings, Attached are the results few minutes ago! It is very bright now! Please notice that each measurement is a stack of 14 or 15 frames. I'm observing using three filters Ic, V, and B. I've uploaded my results to AAVSO. ********************************************************** Best Regards Mohammad Shawkat Odeh IAU Active Member Director of the International Astronomical Center (IAC) Al Khatim Observatory (IAU MPC code M44) Abu Dhabi, UAE <mailto:modeh@… [View More]

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[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.… [View More]

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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 … [View More]

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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 … [View More]

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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 … [View More]

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[vsnet-alert 28069] ASASSN-25ca: new SU UMa-type dwarf nova
by Yusuke Tampo 30 May '25

30 May '25

ASASSN-25ca: new SU UMa-type dwarf nova ASAS-SN reported ASASSN-25ca on 2025-05-20 at g=14.1. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848671 Berto Monard and Josch Hambsch reported the time-resolved observations of ASASSN-25ca. Their observations on 29 May show ordinary superhumps with a period of 0.0588(1) d. Observations on 27 May also show a hint of superhumps but the baseline was too short. Thus, ASASSN-25ca is a new SU UMa-type dwarf nova, and could be a WZ Sge-type … [View More]

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[vsnet-alert 28068] ASASSN-25bz: new SU UMa-type dwarf nova
by Yusuke Tampo 28 May '25

28 May '25

ASASSN-25bz: new SU UMa-type dwarf nova ASASSN-25bz (=AT 2025lkr) was discovered at 14.8 mag on 20 May by ASAS-SN. The suggested outburst amplitude is ~8 mag according to the VSX. ASAS-SN reported to the TNS that this could be a classical nova based on its low Galactic latitude b~-2.0 deg. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848672 I obtained the time-resolved observations of ASASSN-25bz with the SAAO/Lesedi telescope on 26 and 27 May. Its light curve shows a … [View More]

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[vsnet-alert 28066] TCP J18513997+3522412: large-amplitude modulation, possibly eclipsing WZ Sge-type dwarf nova?
by Yusuke Tampo 27 May '25

27 May '25

TCP J18513997+3522412: large-amplitude modulation, possibly eclipsing WZ Sge-type dwarf nova? TCP J18513997+3522412 was discovered by Y. Nakamura on 22nd May at 13.7 mag (unfiltered). The counterpart star in Pan-STARRS1 is r~20.5 mag, and thus the outburst amplitude is 6.8 mag. http://www.cbat.eps.harvard.edu/unconf/followups/J18513997+3522412.html https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848644 Sano-san reported the time-resolved observations of this object. Although … [View More]

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