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

[vsnet-alert 26374] CRTS J050124.1+203818 superoutburst
by Taichi Kato 02 Nov '21

02 Nov '21

CRTS J050124.1+203818 superoutburst YYYYMMDD(UT) mag observer 20211023.7290 <153c (Yutaka Maeda) 20211025.7137 154:c (Yutaka Maeda) 20211026.7107 <143c (Yutaka Maeda) 20211027.7281 154:c (Yutaka Maeda) 20211028.7142 149:cG (Yutaka Maeda) 20211029.7277 <147c (Yutaka Maeda) 20211030.4550 15.330zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26373] ASASSN-19ar bright outburst
by Taichi Kato 02 Nov '21

02 Nov '21

ASASSN-19ar bright outburst YYYYMMDD(UT) mag observer 20211030.3503 15.599zr (Zwicky Transient Facility Lasair (Masci+ 2019)) Long outburst in ZTF data in 2018 Sep.-Oct. (superoutburst?) The current outburst is as bright.

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[vsnet-alert 26372] ASASSN-15cu outburst
by Taichi Kato 02 Nov '21

02 Nov '21

ASASSN-15cu outburst UG+E. Subtype not determined yet. Relatively bright outburst. YYYYMMDD(UT) mag observer 20210915.4985 20.357zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211011.5028 18.842zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211030.4700 15.760zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26371] ASASSN-21tq: likely superhumps
by Taichi Kato 01 Nov '21

01 Nov '21

ASASSN-21tq: likely superhumps Itoh-san, Kiyota-san, Berto Monard and Josch Hambsch have reported observations. The most recent data (since Oct. 28) seem to show superhumps with a period of 0.0588(1) d and an amplitude of 0.10 mag. The data were not in very good quality (weather condition) and further data are needed for confirmation.

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[vsnet-alert 26370] Gaia21efs: likely CV (dwarf nova?)
by Taichi Kato 31 Oct '21

31 Oct '21

Gaia21efs: likely CV (dwarf nova?) Tonny Vanmunster reported observations. The data show 0.15 mag variations (flickering or part of early superhumps?). The object is thus unlikely a microlensing, but likely a CV. Spectroscopy is encouraged.

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[vsnet-alert 26369] OT J002656.6+284933 superhumps
by Taichi Kato 30 Oct '21

30 Oct '21

OT J002656.6+284933 superhumps (=CSS101212:002657+284933) Sano-san and Tamas Tordai have reported observations. 0.3-mag superhumps are clearly present.

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[vsnet-alert 26368] OT J002656.6+284933 superoutburst
by Taichi Kato 29 Oct '21

29 Oct '21

OT J002656.6+284933 superoutburst (=CSS101212:002657+284933) This object is known as an SU UMa star above the period gap with multiple rebrightenings. The last outburst was recorded in 2016. https://ui.adsabs.harvard.edu/abs/2017PASJ...69L...4K/abstract YYYYMMDD(UT) mag observer 20211013.6632 <159c (Yutaka Maeda) 20211014.6574 <167c (Yutaka Maeda) 20211015.6572 <165c (Yutaka Maeda) 20211017.6568 <158c (Yutaka Maeda) 20211023.5999 154:c (Yutaka Maeda) 20211025.5847 153cG (Yutaka Maeda) 20211026.5832 152:cG (Yutaka Maeda) 20211027.5983 153:cG (Yutaka Maeda)

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[vsnet-alert 26367] OGLE-MC-DN-0008: new SU UMa-type dwarf nova
by Taichi Kato 28 Oct '21

28 Oct '21

OGLE-MC-DN-0008: new SU UMa-type dwarf nova Josch Hambsch has reported observations on two nights. The object shows 0.17-mag superhumps with a period of 0.06056(8) d.

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[vsnet-alert 26366] ASASSN-21tr: superhump period
by Taichi Kato 27 Oct '21

27 Oct '21

ASASSN-21tr: superhump period Tonny Vanmunster, Tamas Tordai and Itoh-san have reported observations. The superhump period since Oct. 25 is 0.0666(2) d. The amplitude is still small (0.06 mag) and they are most likely stage A superhumps.

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[vsnet-alert 26365] XM78HT: regular superhumps
by Taichi Kato 27 Oct '21

27 Oct '21

XM78HT: regular superhumps The most recent data by Kyoto U. team on Oct. 26 detected clear ordinary superhumps. The superhumps started growing on Oct. 25 (Vihorlat Obs. team). The current period (stage A) is 0.05596(8) d.

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