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

[vsnet-newvar 10102] 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-newvar 10101] ASASSN-17rf: most likely WZ Sge star with dip + rebrightening
by Taichi Kato 21 May '23

21 May '23

ASASSN-17rf: most likely WZ Sge star with dip + rebrightening From ASAS-SN ver 2 + ATLAS. Deep dip (nearly double outburst), long rebrightening + short ones?

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[vsnet-newvar 10100] 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-newvar 10099] 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-newvar 10098] ASASSN-13ak superoutburst
by Taichi Kato 18 May '23

18 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-newvar 10097] 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-newvar 10096] 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-newvar 10095] 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-newvar 10094] SSSJ105639.8-312211 = SSS120514:105640-312212: polar
by Taichi Kato 17 May '23

17 May '23

SSSJ105639.8-312211 = SSS120514:105640-312212: polar Low and high states (ATLAS+ZTF). Faint M_V and red color. High-state ATLAS data gave an orbital period of 0.0764734(4) d (two peaks per period, full amplitude 0.6 mag).

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[vsnet-newvar 10093] 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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