May 2023 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 17290] ASASSN-17qk: most likely WZ Sge star with multiple rebrightenings
by Taichi Kato 21 May '23

21 May '23

ASASSN-17qk: most likely WZ Sge star with multiple rebrightenings From ASAS-SN ver 2 + ATLAS. Five rebrightenings. No outburst since.

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[vsnet-campaign-dn 17289] PS1-3PIJ181025.43+193128.6 (Gaia18ama): new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 19 May '23

19 May '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of PS1-3PIJ181025.43+193128.6 (aka Gaia18ama) obtained on 2023, May 18/19 at CBA Belgium Observatory using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. My observations were triggered by Taichi Kato's post in vsnet-alert 27762. The resulting light curve clearly shows the presence of regular superhumps with an amplitude of 0.31 mag, establishing PS1-3PIJ181025.43+193128.6 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0) yields a combined superhump period of 0.0892 +/- 0.0020d. The object was at mag CV = 14.5 on May 19th. 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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[vsnet-campaign-dn 17288] ASASSN-13ak superoutburst
by Taichi Kato 19 May '23

19 May '23

ASASSN-13ak superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20230509.558 <177C (Mitsutaka Hiraga) 20230512.3668 17.772g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.5490 19.026o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.5543 19.234o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.5897 18.924o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4253 14.394c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4271 14.394c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4299 14.391c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4495 14.391c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4819 14.394c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4837 14.402c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4911 14.407c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5094 14.402c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230517.653 144c (Tadashi Kojima) 20230518.5695 14.634o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5727 14.695o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-campaign-dn 17287] DM Lyr possible superoutburst
by Taichi Kato 18 May '23

18 May '23

DM Lyr possible superoutburst Judged from supercycle. Known SU UMa star. YYYYMMDD(UT) mag observer 20230511.6945 <158c (Yutaka Maeda) 20230513.5163 17.934o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5195 17.730o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5226 17.460o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.6164 <166C (Masayuki Moriyama) 20230514.069 <148 (Gary Poyner) 20230514.7287 <150c (Yutaka Maeda) 20230514.7291 <166C (Masayuki Moriyama) 20230515.6912 <147c (Yutaka Maeda) 20230516.055 147 (Gary Poyner)

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[vsnet-campaign-dn 17286] Re: PS1-3PIJ181025.43+193128.6 = Gaia18ama outburst
by Taichi Kato 18 May '23

18 May '23

Re: PS1-3PIJ181025.43+193128.6 = Gaia18ama outburst (Name changed) > Suspected SU UMa star. No true superoutburst was recorded > in the past. The current one appears to be the brightest ever. The duration suggests a superoutburst, if it is an SU UMa star. YYYYMMDD(UT) mag observer 20230506.3677 <16.859g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.4977 17.223o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.4995 17.270o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.5030 17.387o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.5134 17.390o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.2419 17.111o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.2765 16.794o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.2797 17.007o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.2851 16.911o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.4771 15.553c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.4795 15.538c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.4850 15.560c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.4950 15.487c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.4887 14.180c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.4906 14.185c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.4937 14.185c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.5243 14.190c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.2333 14.177g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230516.2816 14.307o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.2839 14.318o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.2866 14.299o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.2917 14.261o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230517.651 140c (Tadashi Kojima)

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[vsnet-campaign-dn 17285] Gaia18ama outburst
by Taichi Kato 18 May '23

18 May '23

Gaia18ama outburst Suspected SU UMa star. No true superoutburst was recorded in the past. YYYYMMDD(UT) mag observer 20230422.4431 17.150zg (ZTF Alert DC mag (Masci+ 2019)) 20230422.4659 18.140zr (ZTF Alert DC mag (Masci+ 2019)) 20230424.4425 18.245zr (ZTF Alert DC mag (Masci+ 2019)) 20230424.4608 16.939g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230424.4661 16.963zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4246 17.074zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4538 18.180zr (ZTF Alert DC mag (Masci+ 2019)) 20230428.4456 17.035zg (ZTF Alert DC mag (Masci+ 2019)) 20230428.4650 18.126zr (ZTF Alert DC mag (Masci+ 2019)) 20230430.0831 16.440g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230430.4459 16.522zr (ZTF Alert DC mag (Masci+ 2019)) 20230430.4654 16.096zg (ZTF Alert DC mag (Masci+ 2019)) 20230506.3677 <16.859g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230516.2333 14.177g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230517.651 140c (Tadashi Kojima)

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[vsnet-campaign-dn 17284] ASASSN-18eq: IW And star
by Taichi Kato 17 May '23

17 May '23

ASASSN-18eq: IW And star Type from ATLAS data. IW And-type standstill in 2023 Jan.-Mar. (twice) and some more in the past.

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[vsnet-campaign-dn 17283] ZTF23aajjayv = ATLAS23khx = TCPJ13070070+0659214: likely WZ Sge star
by Taichi Kato 17 May '23

17 May '23

ZTF23aajjayv = ATLAS23khx = TCPJ13070070+0659214: likely WZ Sge star (ASAS-SN positive data before May 13 may have been false detections) Large-amplitude outburst. YYYYMMDD(UT) mag observer 20230512.0661 <16.962g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0673 <17.048g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.0686 16.874g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2494 <15.386g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2507 <15.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.2519 <14.876g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4247 <17.254g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4260 16.854g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230512.4273 16.891g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3678 15.602g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3691 15.647g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230513.3703 15.463g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.2359 14.480o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2438 14.520o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2479 14.494o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.3689 14.031g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3701 14.026g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230514.3714 14.040g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3262 14.161g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3274 14.166g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.3287 14.186g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9732 14.266g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9745 14.256g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230515.9757 14.302g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3228 14.295g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3240 14.314g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) 20230516.3253 14.279g (ASAS-SN survey (Shappee+2014; Kochanek+2017)) Also at 14.0 on May 16 (Yuji Nakamura) from TOCP. ZTF caught at 16.55 on May 13 on the rise.

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[vsnet-campaign-dn 17282] EW Hya: indeed SU UMa star
by Taichi Kato 17 May '23

17 May '23

EW Hya: indeed SU UMa star Greg Bolt has reported observations. The object showed superhumps with a period of 0.081 d and an amplitude of 0.17 mag on May 15. Further observations are requested to refine the period.

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[vsnet-campaign-dn 17281] TCPJ17552445-4743255: possible WZ Sge? peak in April
by Taichi Kato 17 May '23

17 May '23

TCPJ17552445-4743255: possible WZ Sge? peak in April YYYYMMDD(UT) mag observer 20230417.9655 15.000o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230417.9673 15.023o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230417.9703 14.993o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.0018 14.996o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.1933 15.259c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.1961 15.278c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.1989 15.262c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.2041 15.241c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.4206 15.304c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3746 16.372c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3773 16.425c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3835 16.437c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3946 16.416c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4011 16.257c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4043 16.267c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4075 16.295c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4107 16.283c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.0213 16.808o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.0232 16.753o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.0588 16.738o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.0748 16.692o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.9252 17.376o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.9419 17.415o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.9447 17.479o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.9687 17.258o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.3293 16.975c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.3395 16.932c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.3427 16.890c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.3483 16.848c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9250 17.521o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9269 17.281o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9303 17.415o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9317 17.664o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9342 17.674o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9355 17.372o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9394 17.651o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.9446 17.528o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.9385 17.735o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.9726 17.604o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.9907 17.620o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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