June 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27803] Carter_SDSSJ173047.59+554518.5 rare superoutburst (AM CVn)
by Taichi Kato 02 Jun '23

02 Jun '23

Carter_SDSSJ173047.59+554518.5 rare superoutburst (AM CVn) Time-resolved photometry is very much encouraged. Last one in 2016. YYYYMMDD(UT) mag observer 20230519.4613 19.506zr (ZTF Alert DC mag (Masci+ 2019)) 20230520.555 <175C (Mitsutaka Hiraga) 20230521.4107 19.487zr (ZTF Alert DC mag (Masci+ 2019)) 20230522.3612 19.660zr (ZTF Alert DC mag (Masci+ 2019)) 20230523.4322 19.479zg (ZTF Alert DC mag (Masci+ 2019)) 20230523.564 <172C (Mitsutaka Hiraga) 20230525.3606 19.310zr (ZTF Alert DC mag (Masci+ 2019)) 20230525.3891 19.188zr (ZTF Alert DC mag (Masci+ 2019)) 20230525.4054 19.499zg (ZTF Alert DC mag (Masci+ 2019)) 20230531.522 144C (Mitsutaka Hiraga) 20230531.621 144C (Mitsutaka Hiraga) 20230601.2496 14.405g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27802] PS16bqk most likely superoutburst (AM CVn?)
by Taichi Kato 02 Jun '23

02 Jun '23

PS16bqk most likely superoutburst (AM CVn?) As suggested by VSX, the AM CVn type is highly likely. Time-resolved photometry is encouraged. https://www.aavso.org/vsx/index.php?view=detail.top&oid=2387514 YYYYMMDD(UT) mag observer 20230521.3680 15.557zg (ZTF Alert DC mag (Masci+ 2019)) 20230521.4196 15.880zr (ZTF Alert DC mag (Masci+ 2019)) 20230521.5006 15.910o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5024 15.939o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5063 15.931o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5122 15.929o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.4022 16.172zr (ZTF Alert DC mag (Masci+ 2019)) 20230523.4450 15.880zg (ZTF Alert DC mag (Masci+ 2019)) 20230523.6066 16.243o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6098 16.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6130 16.314o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6161 16.219o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.3853 16.439zr (ZTF Alert DC mag (Masci+ 2019)) 20230525.4212 16.161zg (ZTF Alert DC mag (Masci+ 2019)) 20230525.5762 16.517o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5771 16.548o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5803 16.639o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5835 16.637o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5934 16.558o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5971 16.603o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.5975 16.540o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.6069 16.364o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.6187 16.521o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4255 19.080zg (ZTF Alert DC mag (Masci+ 2019)) 20230527.4791 19.212o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230529.4187 16.774o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230529.4214 16.816o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230529.4264 16.831o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230529.4541 16.815o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230530.4052 16.408zg (ZTF Alert DC mag (Masci+ 2019)) 20230531.4750 16.827o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27801] R CrB fading?
by Taichi Kato 02 Jun '23

02 Jun '23

R CrB fading? Several observers have pointed out that R CrB may be getting fainter. YYYYMMDD(UT) mag observer 20230518.9063 60 (Eddy Muyllaert) 20230519.744 61 (Susumu Takahashi) 20230520.542 60 (Susumu Takahashi) 20230520.567 61 (Yoshiyasu Sato) 20230521.008 60 (Gary Poyner) 20230521.985 59 (Gary Poyner) 20230523.001 59 (Gary Poyner) 20230523.544 60 (Hiroyuki Maehara) 20230523.565 64 (Kenji Nakai) 20230523.606 61 (Yoshiyasu Sato) 20230524.019 60 (Gary Poyner) 20230524.485 63 (Tsuneo Horie) 20230524.508 61 (Masashi Nakatani) 20230524.585 61 (Yoshiyasu Sato) 20230524.944 60 (Gary Poyner) 20230525.510 60 (Hiroyuki Maehara) 20230525.581 61 (Yoshiyasu Sato) 20230526.990 60 (Gary Poyner) 20230527.442 65 (Tsuneo Horie) 20230527.978 62 (Gary Poyner) 20230528.965 64 (Gary Poyner) 20230529.8785 62 (Jose Ripero) 20230529.951 64 (Gary Poyner) 20230530.492 61 (Yoshiyasu Sato) 20230531.535 62 (Yoshiyasu Sato) 20230531.597 64 (Masashi Nakatani) 20230531.867 66 (Klaus Wenzel)

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[vsnet-alert 27800] ASASSN-16ee superoutburst?
by Taichi Kato 01 Jun '23

01 Jun '23

ASASSN-16ee superoutburst? Past one in 2021 Oct.-Nov. YYYYMMDD(UT) mag observer 20230510.7270 16.093c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.7299 16.107c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.7359 16.113c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.7457 16.122c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.0008 17.519o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.0041 17.398o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.0126 17.592o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.0230 17.511o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1023 16.221o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1053 16.186o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1118 16.132o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1242 16.119o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1246 15.974o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1270 16.050o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1326 16.236o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230515.1427 16.261o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.7431 16.256c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.7469 16.285c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.7536 16.330c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.7634 16.199c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.0139 16.679o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.0237 16.631o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.0279 16.695o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.0377 16.747o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.7311 16.755c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.7345 16.786c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.7397 16.793c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.7498 16.764c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230520.9890 16.839o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230520.9922 16.925o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230520.9986 16.904o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.0105 17.026o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27799] ASASSN-16gr likely superoutburst
by Taichi Kato 01 Jun '23

01 Jun '23

ASASSN-16gr likely superoutburst Supercycle about 300 d (ATLAS+ZTF+ASAS-SN). YYYYMMDD(UT) mag observer 20230522.3994 18.152zr (ZTF Alert DC mag (Masci+ 2019)) 20230522.4211 18.308zg (ZTF Alert DC mag (Masci+ 2019)) 20230523.0629 15.114g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230523.7858 <144c (Yutaka Maeda) 20230523.9831 15.368g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230524.3995 15.426zr (ZTF Alert DC mag (Masci+ 2019)) 20230525.0069 15.296c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.0378 15.560c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.0434 15.593c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230525.0467 15.610c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4584 15.678zr (ZTF Alert DC mag (Masci+ 2019)) 20230526.9619 15.223g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230527.9531 15.373g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230528.0439 15.839c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.0472 15.806c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.0499 15.906c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.9557 15.502g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230530.2748 15.547g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27798] ZTF23aajjayv: emerging superhumps?
by Taichi Kato 01 Jun '23

01 Jun '23

ZTF23aajjayv: emerging superhumps? According to the most recent observations by Tonny Vanmunster, superhumps may have emerged since May 28. I have not been able to determine the period.

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[vsnet-alert 27797] ASASSN-18fp superhumps
by Taichi Kato 01 Jun '23

01 Jun '23

ASASSN-18fp superhumps Peter Starr has reported observations on two nights. Superhumps were present and the period was 0.06448(2) d. Not a WZ Sge star as judged from the early appearance of superhumps.

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vsnet-alert June 2023