- vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 17103] ASASSN-18acd likely superoutburst
by Taichi Kato 29 Mar '23

29 Mar '23

ASASSN-18acd likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20230313.5258 14.969zr (ZTF Alert DC mag (Masci+ 2019)) 20230313.5283 14.973zr (ZTF Alert DC mag (Masci+ 2019)) 20230313.5308 14.991zr (ZTF Alert DC mag (Masci+ 2019)) 20230313.5333 15.004zr (ZTF Alert DC mag (Masci+ 2019)) 20230317.5208 15.337zr (ZTF Alert DC mag (Masci+ 2019)) 20230317.5234 15.273zr (ZTF Alert DC mag (Masci+ 2019)) 20230317.5259 15.242zr (ZTF Alert DC mag (Masci+ 2019)) 20230317.5284 15.161zr (ZTF Alert DC mag (Masci+ 2019)) 20230317.5310 15.156zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.5202 15.505zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.5227 15.530zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.5253 15.528zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.5278 15.508zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.5304 15.520zr (ZTF Alert DC mag (Masci+ 2019)) 20230327.8535 162:C (Masayuki Moriyama) 20230329.8061 166:C (Masayuki Moriyama)

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[vsnet-campaign-dn 17102] V1251 Cyg apparently reached peak
by Taichi Kato 29 Mar '23

29 Mar '23

V1251 Cyg apparently reached peak YYYYMMDD(UT) mag observer 20230327.8551 <159C (Masayuki Moriyama) 20230328.7938 14.29C (Masayuki Moriyama) 20230328.8567 14.04C (Masayuki Moriyama) 20230329.208 12.67C (Gary Poyner) 20230329.7891 12.77V (Masayuki Moriyama) 20230329.7908 13.01C (Masayuki Moriyama)

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[vsnet-campaign-dn 17101] ASASSN-VJ065237.19+243622.3: IW And star, similar to BO Cet?
by Taichi Kato 28 Mar '23

28 Mar '23

ASASSN-VJ065237.19+243622.3: IW And star, similar to BO Cet? ATLAS+ASAS-SNL+ATLAS data. IW And state in 2016-2019. In 2021 Oct. - 2022 Apr., standstill - brightening - fading - cycles of outbursts - long, bright outburst in 2022 Apr. similar to BO Cet. Although the data were not sufficient, this outburst may have been a superoutburst. The object is bright (15-16 mag) and observations are encouraged.

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[vsnet-campaign-dn 17100] SU UMa likely superoutburst
by Taichi Kato 28 Mar '23

28 Mar '23

SU UMa likely superoutburst (From supercycle) YYYYMMDD(UT) mag observer 20230319.5127 147C (Masayuki Moriyama) 20230319.8229 <141 (Jose Ripero) 20230320.3041 14.446o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.3099 14.560o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.3135 14.531o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.3216 14.724o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.3247 14.600o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.3265 14.618o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230321.8653 <144 (Eddy Muyllaert) 20230323.051 150 (Gary Poyner) 20230324.047 149 (Gary Poyner) 20230326.5921 133cG (Yutaka Maeda) 20230327.6137 114cG (Yutaka Maeda) 20230327.6514 119C (Masayuki Moriyama) 20230327.8326 115 (Eddy Muyllaert)

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[vsnet-campaign-dn 17099] SDSSJ100515.39+191108.0 superoutburst
by Taichi Kato 28 Mar '23

28 Mar '23

SDSSJ100515.39+191108.0 superoutburst YYYYMMDD(UT) mag observer 20230320.1142 <187C (Masao Funada) 20230321.953 <17.30C (Gary Poyner) 20230321.9542 <185C (Masao Funada) 20230326.6222 <149c (Yutaka Maeda) 20230327.6384 125cG (Yutaka Maeda)

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[vsnet-campaign-dn 17098] MASTER OT J174816.22+501723.3 superhumps
by Taichi Kato 28 Mar '23

28 Mar '23

MASTER OT J174816.22+501723.3 superhumps Tamas Tordai's observations indeed recorded superhumps (Mar. 27-28).

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[vsnet-campaign-dn 17097] V1251 Cyg outburst (first since 2008)
by Taichi Kato 28 Mar '23

28 Mar '23

V1251 Cyg outburst (first since 2008) This is obviously an alert matter. YYYYMMDD(UT) mag observer 20230314.8506 <166C (Masayuki Moriyama) 20230318.8577 <155C (Masayuki Moriyama) 20230319.8561 <162C (Masayuki Moriyama) 20230327.8551 <159C (Masayuki Moriyama) 20230328.7938 14.29C (Masayuki Moriyama) Last superoutburst in 2008 and earlier ones in 1994 and 1997. Considering a supercycle of 11 years, the next superoutburst is overdue. The current outburst was detected early and time-resolved photometry is very desirable. This object is a long-Porb WZ Sge star and early superhumps were visible in the earliest state of a superoutburst.

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[vsnet-campaign-dn 17096] V793 Ara: dwarf nova
by Taichi Kato 28 Mar '23

28 Mar '23

V793 Ara: dwarf nova From ATLAS data. Light curve is relatively regular and an SU UMa star cannot be excluded. Cycle of bright outburst about 80 d. Next long one is expected in late May. Bright object (above 15 mag at peak).

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[vsnet-campaign-dn 17095] Re: TCPJ06461075+2502415 brightening!
by Taichi Kato 27 Mar '23

27 Mar '23

Re: TCPJ06461075+2502415 brightening! > Sano-san has reported that this object brightened above > 15 mag and was apparently still brightening on Mar. 27. This turned out to be an error.

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[vsnet-campaign-dn 17094] ASASSN-23bx: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 27 Mar '23

27 Mar '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-23bx, obtained on 2023, Mar 27/28 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of regular superhumps with a large amplitude of 0.58 mag, establishing ASASSN-23bx as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and Conditional Entropy methods (Peranso 3.0) yields a combined superhump period of 0.0589 +/- 0.0005d. The object was at mag CV = 16.5 on Mar 28th. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory <http://www.cbabelgium.com> http://www.cbabelgium.com PERANSO: The Light Curve and Period Analysis Software http://www.peranso.com

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