December 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27039] GX Cas (UGSU) outburst
by Kirill Sokolovsky 20 Aug '23

20 Aug '23

The UGSU-type dwarf nova GX Cas is in outburst according to NMW survey photometry (135mm f/2.0 lens + unfiltered ST-8300M CCD): 2022-11-13.7397 2459897.2397 13.4 CV AAVSO observer KLO reports visual observation of this outburst: 2022-11-12.9520 2459896.4520 13.6 Vis. ASAS-SN photometry (latest observation is quiescence on 2022-11-12.165): https://asas-sn.osu.edu/sky-patrol/coordinate/7c8f8333-01a3-49aa-ba14-08b07… VSX record for GX Cas https://www.aavso.org/vsx/index.php?view=detail.top&oid=6537 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko

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[vsnet-alert 27260] AY Lac rapidly faded
by Taichi Kato 30 Dec '22

30 Dec '22

AY Lac rapidly faded YYYYMMDD(UT) mag observer 20221220.5363 <139cG (Yutaka Maeda) 20221222.1777 16.273zg (ZTF Alert DC mag (Masci+ 2019)) 20221222.2272 16.306zr (ZTF Alert DC mag (Masci+ 2019)) 20221223.797 163C (Jeremy Shears) 20221224.857 17.21C (Gary Poyner) 20221225.413 18.27C (Hiroshi Itoh) 20221225.4545 <146c (Yutaka Maeda) 20221225.5029 <141cG (Yutaka Maeda) 20221225.5580 <173C (Masayuki Moriyama) 20221226.5805 <167C (Masayuki Moriyama)

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[vsnet-alert 27259] WX Hyi superoutburst
by Taichi Kato 30 Dec '22

30 Dec '22

WX Hyi superoutburst YYYYMMDD(UT) mag observer 20221222.596 147 (Rod Stubbings) 20221224.619 157 (Rod Stubbings) 20221225.582 155 (Rod Stubbings) 20221226.569 147 (Rod Stubbings) 20221227.578 123 (Rod Stubbings) 20221229.603 116 (Rod Stubbings)

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[vsnet-alert 27258] ASASSN-22ak: very rapid fading!
by Taichi Kato 30 Dec '22

30 Dec '22

ASASSN-22ak: very rapid fading! Josch Hambsch has reported further observations. Although no definite superhump signal has been detected, the object suddenly faded by 1.8 mag on Dec. 29 (probably more than 2 mag/d since there was no hint of fading during Dec. 28 observations). This fading supports my second interpretation as an AM CVn star. The object is still expected to be detectable and please continue observations.

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[vsnet-alert 27257] ATLAS17mmm likely superoutburst
by Taichi Kato 28 Dec '22

28 Dec '22

ATLAS17mmm likely superoutburst YYYYMMDD(UT) mag observer 20221221.2523 16.262zg (ZTF Alert DC mag (Masci+ 2019)) 20221221.2940 16.548zr (ZTF Alert DC mag (Masci+ 2019)) 20221226.6417 16.79C (Masayuki Moriyama)

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[vsnet-alert 27256] APA-V1 superoutburst?
by Taichi Kato 28 Dec '22

28 Dec '22

APA-V1 superoutburst? Suspected SU UMa star. Last likely superoutburst in 2020 July (ZTF data). YYYYMMDD(UT) mag observer 20221126.5886 <165C (Masayuki Moriyama) 20221205.5022 <168C (Masayuki Moriyama) 20221226.5015 16.17C (Masayuki Moriyama)

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[vsnet-alert 27255] CRTSJ091245.9-034916 outburst
by Taichi Kato 28 Dec '22

28 Dec '22

CRTSJ091245.9-034916 outburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221205.8328 <153c (Yutaka Maeda) 20221207.7902 <146c (Yutaka Maeda) 20221208.7800 <151c (Yutaka Maeda) 20221209.4243 17.785zg (ZTF Alert DC mag (Masci+ 2019)) 20221209.8217 <157c (Yutaka Maeda) 20221211.8374 <162C (Masayuki Moriyama) 20221215.4745 17.199zr (ZTF Alert DC mag (Masci+ 2019)) 20221223.4359 15.615zr (ZTF Alert DC mag (Masci+ 2019)) 20221223.4440 15.442zg (ZTF Alert DC mag (Masci+ 2019)) 20221225.7562 <146c (Yutaka Maeda) 20221225.8270 157C (Masayuki Moriyama)

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[vsnet-alert 27254] EF Eri: dips
by Taichi Kato 27 Dec '22

27 Dec '22

EF Eri: dips Observations by Kiyota-san and Itoh-san clearly shows short-duration dips such as at 2022 Dec. 25.618 (UT). These dips were not seen in every orbit but were present almost on every night. The durations were 2-3 min and were 0.8-mag deep. Ingress was slower and egress was sometimes sudden (within 30s).

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[vsnet-alert 27253] SDSSJ074640.62+173412.8 likely superoutburst
by Taichi Kato 27 Dec '22

27 Dec '22

SDSSJ074640.62+173412.8 likely superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221207.7198 <153c (Yutaka Maeda) 20221208.7126 <147c (Yutaka Maeda) 20221209.7395 <148c (Yutaka Maeda) 20221215.6636 <155c (Yutaka Maeda) 20221220.6618 <152c (Yutaka Maeda) 20221225.6450 159:c (Yutaka Maeda)

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[vsnet-alert 27252] CRTSJ000024.7+332543 likely superoutburst
by Taichi Kato 27 Dec '22

27 Dec '22

CRTSJ000024.7+332543 likely superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221220.5264 <161c (Yutaka Maeda) 20221224.5282 <159c (Yutaka Maeda) 20221225.4947 148cG (Yutaka Maeda) 20221225.4948 148cG (Yutaka Maeda)

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vsnet-alert December 2022