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

[vsnet-alert 26480] ZTF J210411.01-010202.3 = Gaia21fhx: superoutburst of AM CVn star?
by Taichi Kato 06 Dec '21

06 Dec '21

ZTF J210411.01-010202.3 = Gaia21fhx: superoutburst of AM CVn star? Josch Hambsch have reported observations. The object gradually faded from Nov. 28 to Dec. 4, then followed by sudden fading by 1.8 mag on the next night. This fading rate is too large for a hydrogen-rich dwarf nova. This object may be an AM CVn star (or EI Psc star) and further observations are encouraged.

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[vsnet-alert 26479] CTCVJ1940-4724
by Taichi Kato 04 Dec '21

04 Dec '21

CTCVJ1940-4724 likely superoutburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fjv/ Gaia21fjv AT2020qvc 2021-12-01 14:29:06 295.15681 -47.41402 13.32 16.12 1.02 CV 2021-12-03 11:07:56 outburst in known CV CTCV J1940-4724

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[vsnet-alert 26478] CRTS J072144.5+663838 likely superoutburst
by Taichi Kato 04 Dec '21

04 Dec '21

CRTS J072144.5+663838 likely superoutburst (Relatively short supercycle) http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fjy/ Gaia21fjy AT2021agbm 2021-12-01 23:21:00 110.43524 66.64385 15.57 17.63 0.91 CV 2021-12-03 11:08:16 outburst in confirmed CV CSS111124:072144+663838

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[vsnet-alert 26477] MASTER OT J030227.28+191754.5: period of early superhumps
by Taichi Kato 02 Dec '21

02 Dec '21

MASTER OT J030227.28+191754.5: period of early superhumps Kyoto U team, Itoh-san, Kiyota-san, Tamas Tordai, Osaka Kyoiku U team, Josch Hambsch and Tonny Vanmunster have reported observations. The period of early superhumps is 0.05985(3) d (full amplitude 0.03 mag). During the rising phase, this period was not detected.

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[vsnet-alert 26476] TU Men: not much superhumps?
by Taichi Kato 02 Dec '21

02 Dec '21

TU Men: not much superhumps? Josch Hambsch has reported observations on Dec. 2. No prominent superhumps were detected but there were some variations. Let's see whether superhumps develop or not.

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[vsnet-alert 26475] PU Per: superhumps
by Taichi Kato 02 Dec '21

02 Dec '21

PU Per: superhumps Kiyota-san detected superhumps on Nov. 28.

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[vsnet-alert 26474] TCP J20441708-2037591: new SU UMa-type dwarf nova
by Taichi Kato 02 Dec '21

02 Dec '21

TCP J20441708-2037591: new SU UMa-type dwarf nova Josch Hambsch, Itoh-san and Kiyota-san have reported observations. According to the data by Hambsch, this object started to show superhumps on Nov. 30. Due to the short visibility in the evening sky, the superhump period has not been yet determined.

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[vsnet-alert 26473] TU Men possible superoutburst
by Taichi Kato 01 Dec '21

01 Dec '21

TU Men possible superoutburst As pointed out by Rod Stubbings in [vsnet-outburst 28070], TU Men has brightened after a possible precursor followed by a possible dip. This outburst may be a long-sought superoutburst. Although this object is known as an SU UMa star above the period gap, superhumps have only been recorded back to 1980! No true superoutbursts have been recorded since. https://ui.adsabs.harvard.edu/abs/1984A%26A...132..187S/abstract YYYYMMDD(UT) mag observer 20211127.510 165 (Rod Stubbings) 20211128.506 166 (Rod Stubbings) 20211129.487 125 (Rod Stubbings) 20211129.537 128 (Rod Stubbings) 20211129.646 129 (Rod Stubbings) 20211130.466 118 (Rod Stubbings) 20211130.507 118 (Rod Stubbings) As one can see in the above paper dealing with the 1980 superoutburst, the initial phase was not observed and there was a gap in the middle. These observations were made before we have sufficient knowledge about superhump evolution. Southern observers, please turn your telescope to TU Men and perform time-resolved photometry to cover the entire phases of the outburst. Such a chance may be only once in 40 years!

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[vsnet-alert 26472] Gaia21fik
by Taichi Kato 30 Nov '21

30 Nov '21

Gaia21fik http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fik/ Gaia21fik AT2021afrn 2021-11-15 09:19:56 197.40356 -70.83968 14.85 unknown 2021-11-29 11:52:30 bright blue hostless transient

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[vsnet-alert 26471] MASTER OT J030227.28+191754.5: WZ Sge-type dwarf nova having the largest outburst amplitude
by Keisuke Isogai 29 Nov '21

29 Nov '21

MASTER OT J030227.28+191754.5: WZ Sge-type dwarf nova having the largest outburst amplitude We reported the results of our spectroscopic and photometric observations to ATel: https://www.astronomerstelegram.org/?read=15074 Within one day, the spectra had significantly changed to that of typical dwarf nova. We also detected early superhump-like modulations. Thus this object will be the WZ Sge-type dwarf nova having the largest outburst amplitude so far.

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