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

[vsnet-alert 27772] V592 Her superoutburst, recent data
by Taichi Kato 24 May '23

24 May '23

V592 Her superoutburst, recent data Apparently in SU UMa mode (superoutburst in 2021 Dec.). Quiescence has become brighter (ZTF data). Itoh-san already detected superhump-like modulations. YYYYMMDD(UT) mag observer 20230518.1626 <18.162g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.4078 <18.399g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.9549 <142 (Eddy Muyllaert) 20230519.6030 <144c (Yutaka Maeda) 20230521.022 <153 (Gary Poyner) 20230521.1861 15.227g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230521.4146 16.026o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4209 15.989o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4232 16.011o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4469 16.005o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4696 15.395g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230522.008 <149 (Gary Poyner) 20230522.4398 16.024g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230522.989 15.10 (Pavol A. Dubovsky) 20230523.026 15.17 (Pavol A. Dubovsky) 20230523.1519 15.120g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230523.5219 15.609o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5255 15.620o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5333 15.588o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6072 150:c (Yutaka Maeda)

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[vsnet-alert 27770] V592 Her in outburst
by Pavol A. Dubovsky 23 May '23

23 May '23

HERV592 20230522.989 15.10 DPV OUTBURST -- Pavol A. Dubovsky Vihorlat Observatory Humenne SLOVAKIA http://var.kozmos.sk

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[vsnet-alert 27769] ZTF23aajjayv still bright
by Taichi Kato 23 May '23

23 May '23

ZTF23aajjayv still bright The light curve suggests a superoutburst. 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)) 20230513.3099 15.520zr (ZTF Alert DC mag (Masci+ 2019)) 20230513.3544 15.942zg (ZTF Alert DC mag (Masci+ 2019)) 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)) 20230515.2651 14.217zg (ZTF Alert DC mag (Masci+ 2019)) 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)) 20230517.2755 14.455zr (ZTF Alert DC mag (Masci+ 2019)) 20230517.3008 14.431zg (ZTF Alert DC mag (Masci+ 2019)) 20230519.2269 14.588zr (ZTF Alert DC mag (Masci+ 2019)) 20230519.3191 14.640zg (ZTF Alert DC mag (Masci+ 2019)) 20230520.6197 15.15C (Masayuki Moriyama) 20230521.5852 152C (Masayuki Moriyama)

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[vsnet-alert 27768] ASASSN-18dh: most likely superoutburst (AM CVn?)
by Taichi Kato 22 May '23

22 May '23

ASASSN-18dh: most likely superoutburst (AM CVn?) 2021 outburst followed by multiple rebrightenings + fading tail (ATLAS+ZTF). Less clear but similar in 2018. Resembles an AM CVn star. YYYYMMDD(UT) mag observer 20230506.2587 16.138g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.3587 <17.350g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.3436 <17.899g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.9126 <16.261g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.1877 <16.957g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.3366 16.112g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.1866 <17.921g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230517.2269 15.779g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.7854 16.204c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.7886 16.252c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.7942 16.247c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.8043 16.208c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.2205 16.119g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27767] Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading
by Taichi Kato 21 May '23

21 May '23

Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23btd/ Non-red and luminious object. Consistent with RCB. 2MASS 161615.906 -544445.35 (2000.0) 12.495 12.134 11.774 161615.9 -544445 (2000.0) Gaia_DR3_5931782154434729600 RS (score=0.01) 161615.931 -544445.47 (2000.0) Gaia_DR2_5931782154434729600 plx=0.015(0.032) dismod=19.2 pmra=-2.920(0.052) pmdec=-2.724(0.041) G=14.549 BP=15.236 RP=13.707 161615.930 -544445.47 (2000.0) Gaia_EDR3_5931782154434729600 plx=0.021(0.024) dismod=18.4 pmra=-2.885(0.028) pmdec=-2.745(0.021) G=14.538 BP=15.214 RP=13.699

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[vsnet-alert 27766] SN 2023ixf in M101
by FIDRICH Robert 20 May '23

20 May '23

Preliminary photometry: SN 2023ixf 2023 May 20.4517UT 13.05V Clear skies, Róbert Fidrich HAA/VSS

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[vsnet-alert 27765] 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-alert 27764] 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-alert 27763] 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-alert 27762] 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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