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

[vsnet-alert 27219] EF Eri short-term variations
by Taichi Kato 21 Dec '22

21 Dec '22

EF Eri short-term variations Kyoto U. team obtained high time-resolution observations. The object showed QPO-like variations with time scales of about 5 min. They could arise from instabilities in the accretion column. Itoh-san and Kiyota-san also reported observations showing large modulations.

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[vsnet-alert 27218] Re: EF Eri (polar) still bright
by Taichi Kato 20 Dec '22

20 Dec '22

Re: EF Eri (polar) still bright Peter Starr reported time-resolved observations. Variations up to 0.8 mag were present.

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[vsnet-alert 27217] PY Per even brighter
by Taichi Kato 20 Dec '22

20 Dec '22

PY Per even brighter YYYYMMDD(UT) mag observer 20221211.5436 <163c (Yutaka Maeda) 20221212.8611 <141 (Eddy Muyllaert) 20221214.044 <147 (Gary Poyner) 20221215.024 150 (Gary Poyner) 20221215.5773 147cG (Yutaka Maeda) 20221216.8403 <141 (Eddy Muyllaert) 20221217.174 14.56C (Gary Poyner) 20221218.7299 140C (Masayuki Moriyama)

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[vsnet-alert 27216] MGAB-V298 (AM CVn:) bright outburst
by Taichi Kato 20 Dec '22

20 Dec '22

MGAB-V298 (AM CVn:) bright outburst Likely superoutburst. YYYYMMDD(UT) mag observer 20221120.3517 21.643zr (ZTF Alert DC mag (Masci+ 2019)) 20221121.7591 <171C (Masayuki Moriyama) 20221126.8861 <157C (Masayuki Moriyama) 20221201.3930 21.746zr (ZTF Alert DC mag (Masci+ 2019)) 20221218.7800 165C (Masayuki Moriyama)

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[vsnet-alert 27215] AQ Eri stopped fading
by Taichi Kato 20 Dec '22

20 Dec '22

AQ Eri stopped fading Suggestion of a precursor? YYYYMMDD(UT) mag observer 20221217.473 150 (Rod Stubbings) 20221218.478 165 (Rod Stubbings) 20221219.475 165 (Rod Stubbings) 20221219.540 <138 (Takuichiro Onishi)

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[vsnet-alert 27214] V528 Cam outburst
by Taichi Kato 20 Dec '22

20 Dec '22

V528 Cam outburst Known WZ Sge star. Last superoutburst in 2020 Feb. YYYYMMDD(UT) mag observer 20221124.6736 <157c (Yutaka Maeda) 20221126.6738 <157c (Yutaka Maeda) 20221130.0597 <190cG (Masao Funada) 20221215.5934 <161c (Yutaka Maeda) 20221219.0726 15.80C (Masao Funada)

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[vsnet-alert 27213] ASASSN-15sm outburst
by Taichi Kato 20 Dec '22

20 Dec '22

ASASSN-15sm outburst Known SU UMa star. Relatively rare and possible superoutburst. YYYYMMDD(UT) mag observer 20221218.1662 15.36C (Masao Funada)

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[vsnet-alert 27212] GK Per somewhat active?
by Taichi Kato 20 Dec '22

20 Dec '22

GK Per somewhat active? As suggested in 2021, the next outburst is already due. YYYYMMDD(UT) mag observer 20221209.6807 127cG (Yutaka Maeda) 20221210.422 131 (Tsuneo Horie) 20221212.431 132 (Tsuneo Horie) 20221212.794 128CV (Klaus Wenzel) 20221212.8014 127 (Eddy Muyllaert) 20221213.413 132 (Tsuneo Horie) 20221214.040 127 (Gary Poyner) 20221214.408 131 (Tsuneo Horie) 20221215.017 127 (Gary Poyner) 20221215.417 132 (Tsuneo Horie) 20221215.5973 124cG (Yutaka Maeda) 20221216.422 131 (Tsuneo Horie) 20221216.574 129 (Takuichiro Onishi) 20221216.712 129 (Klaus Wenzel) 20221216.7625 129 (Eddy Muyllaert) 20221217.0284 12.80cG (Masao Funada) 20221218.391 132 (Tsuneo Horie) 20221218.426 123 (Takuichiro Onishi) 20221218.7374 126C (Masayuki Moriyama) 20221219.389 128 (Tsuneo Horie)

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[vsnet-alert 27211] EF Eri (polar) still bright
by Taichi Kato 20 Dec '22

20 Dec '22

EF Eri (polar) still bright Large-amplitude variations were suggested from observations by Josch Hambsch. The time resolution was not enough. Observations with higher time resolution are recommended. YYYYMMDD(UT) mag observer 20221123.5642 <162C (Masayuki Moriyama) 20221216.624 148 (Rod Stubbings) 20221216.651 147 (Rod Stubbings) 20221216.658 147 (Rod Stubbings) 20221217.483 146 (Rod Stubbings) 20221218.076 14.26C (Gary Poyner) 20221218.0759 14.20C (Masao Funada) 20221218.878 14.11C (Gary Poyner) 20221218.8778 13.94C (Masao Funada)

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[vsnet-alert 27210] AQ Eri faded rapidly
by Taichi Kato 19 Dec '22

19 Dec '22

AQ Eri faded rapidly (Might be a precursor) YYYYMMDD(UT) mag observer 20221214.1104 16.77C (Masao Funada) 20221215.478 130 (Rod Stubbings) 20221215.4880 132cG (Yutaka Maeda) 20221215.617 134 (Hiroyuki Maehara) 20221215.663 132 (Takuichiro Onishi) 20221216.0757 13.56C (Masao Funada) 20221216.490 136 (Rod Stubbings) 20221216.587 136 (Takuichiro Onishi) 20221216.9340 141 (Eddy Muyllaert) 20221217.0169 14.53C (Masao Funada) 20221217.473 150 (Rod Stubbings) 20221218.478 165 (Rod Stubbings)

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vsnet-alert December 2022