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

[vsnet-newvar 9650] Re: ASASSN-22ak outburst (V3101 Cyg analog?)
by Taichi Kato 21 Dec '22

21 Dec '22

Re: ASASSN-22ak outburst (V3101 Cyg analog?) Berto Monard had reported single-night observation on 2022 Jan. 18, during the first superoutburst at mag slightly below 15. There was some hint of modulations with a period of 0.044 d, but this is not reliable due to the shortness of the run. Observations are encouraged while this object is still in outburst.

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[vsnet-newvar 9649] ASASSN-22ak outburst (V3101 Cyg analog?)
by Taichi Kato 21 Dec '22

21 Dec '22

ASASSN-22ak outburst (V3101 Cyg analog?) > The outburst behavior is rather atypical. ASAS-SN light curve: https://asas-sn.osu.edu/sky-patrol/coordinate/69fa9f75-419d-482e-8a8b-0e031… All outbursts look like superoutbursts. The object looked like dormant before the exceptionally bright (13.1 mag) outburst in 202 Jan. Might be an object similar to V3101 Cyg (=TCP J21040470+4631129). ASASSN-22ak have much longer outbursts compared to "rebightening"-type superoutbursts in V3101 Cyg. An AM CVn star would also be a candidate considering the short recurrence time of superoutbursts. Detailed observations are encouraged anyway.

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[vsnet-newvar 9648] ASASSN-22ak outburst
by Taichi Kato 21 Dec '22

21 Dec '22

ASASSN-22ak outburst The outburst behavior is rather atypical. YYYYMMDD(UT) mag observer 20221218.546 162 (Rod Stubbings) 20221219.540 161 (Rod Stubbings) 20221220.574 163 (Rod Stubbings)

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[vsnet-newvar 9647] 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-newvar 9646] 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-newvar 9645] ASASSN-14ff superoutburst continues
by Taichi Kato 16 Dec '22

16 Dec '22

ASASSN-14ff superoutburst continues YYYYMMDD(UT) mag observer 20221208.4790 <141c (Yutaka Maeda) 20221209.4996 147c (Yutaka Maeda) 20221209.4996 147c (Yutaka Maeda) 20221211.4437 <143c (Yutaka Maeda) 20221211.6983 155C (Masayuki Moriyama) 20221212.0620 15.04C (Masao Funada) 20221215.478 148 (Rod Stubbings)

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[vsnet-newvar 9644] CRTSJ015051.5+332622 long outburst continues
by Taichi Kato 16 Dec '22

16 Dec '22

CRTSJ015051.5+332622 long outburst continues YYYYMMDD(UT) mag observer 20221123.5591 <155c (Yutaka Maeda) 20221124.5718 <159c (Yutaka Maeda) 20221126.5644 <161c (Yutaka Maeda) 20221201.1543 14.617zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.2164 14.452zg (ZTF Alert DC mag (Masci+ 2019)) 20221202.5622 150c (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221207.5577 150:c (Yutaka Maeda) 20221208.5522 152c (Yutaka Maeda) 20221208.5559 15.44C (Masayuki Moriyama) 20221209.5730 155c (Yutaka Maeda) 20221209.5730 155c (Yutaka Maeda) 20221210.1955 15.501zr (ZTF Alert DC mag (Masci+ 2019)) 20221210.1960 15.524zr (ZTF Alert DC mag (Masci+ 2019)) 20221210.2188 15.393zg (ZTF Alert DC mag (Masci+ 2019)) 20221210.2193 15.387zg (ZTF Alert DC mag (Masci+ 2019)) 20221211.6604 15.91C (Masayuki Moriyama)

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[vsnet-newvar 9643] SDSSJ091935.66+502825.2 fading
by Taichi Kato 16 Dec '22

16 Dec '22

SDSSJ091935.66+502825.2 fading Tonny Vanmunster and Itoh-san have reported observations. There were no clear superhumps and the object was likely fading rather rapidly.

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[vsnet-newvar 9642] SDSSJ091935.66+502825.2 outburst
by Taichi Kato 14 Dec '22

14 Dec '22

SDSSJ091935.66+502825.2 outburst This is a suspected SU UMa star. YYYYMMDD(UT) mag observer 20221120.756 <177C (Mitsutaka Hiraga) 20221202.865 <174C (Mitsutaka Hiraga) 20221213.917 146C (Jeremy Shears)

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[vsnet-newvar 9641] ASASSN-20na
by Taichi Kato 13 Dec '22

13 Dec '22

ASASSN-20na Tonny Vanmunster reported observations on Dec. 11. The object varied between 17.2 and 17.5. There was some possible indication of superhumps, but the result was not conclusive. The object had already faded much and it was likely superhumps had already become irregular.

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