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

[vsnet-newvar 9630] CRTSJ205252.3-061441 (AM CVn:) likely superoutburst continues
by Taichi Kato 10 Dec '22

10 Dec '22

CRTSJ205252.3-061441 (AM CVn:) likely superoutburst continues (Rebgihtening expected) YYYYMMDD(UT) mag observer 20221122.1094 17.418zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.1041 17.646zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.1331 17.851zr (ZTF Alert DC mag (Masci+ 2019)) 20221124.1084 17.682zg (ZTF Alert DC mag (Masci+ 2019)) 20221130.1276 18.529zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.1463 18.402zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9629] CRTSJ080853.7+355053 likely superoutburst continues
by Taichi Kato 09 Dec '22

09 Dec '22

CRTSJ080853.7+355053 likely superoutburst continues YYYYMMDD(UT) mag observer 20221026.4355 19.322zg (ZTF Alert DC mag (Masci+ 2019)) 20221026.4968 19.070zr (ZTF Alert DC mag (Masci+ 2019)) 20221105.4645 18.698zr (ZTF Alert DC mag (Masci+ 2019)) 20221118.4268 16.010zg (ZTF Alert DC mag (Masci+ 2019)) 20221118.4991 16.182zr (ZTF Alert DC mag (Masci+ 2019)) 20221120.3913 16.066zg (ZTF Alert DC mag (Masci+ 2019)) 20221121.8070 16.58C (Masayuki Moriyama) 20221126.8817 <163C (Masayuki Moriyama) 20221202.8351 170C (Masayuki Moriyama)

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[vsnet-newvar 9628] ASASSN-20na outburst
by Taichi Kato 09 Dec '22

09 Dec '22

ASASSN-20na outburst Most likely SU UMa star from ZTF data (superoutburst + rebrightening in 2020 Sep.-Oct.). YYYYMMDD(UT) mag observer 20221117.517 <174C (Mitsutaka Hiraga) 20221130.1169 15.853zg (ZTF Alert DC mag (Masci+ 2019)) 20221130.1428 15.887zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9627] Re: DDE 35: more likely a polar
by Taichi Kato 09 Dec '22

09 Dec '22

Re: DDE 35: more likely a polar E. Pavlenko has advised that this object is too blue for a polar. The data by Crimean Astrophys. Obs. team in 2020 showed flickering, but no indication of stable superhumps nor orbital variation. Although a period of 0.20976(3) d was suspected from CrAO observations (by my analysis), this period was not detected in the ZTF data. This object indeed looks like a CV with high/low states, but is certainly neither an SU UMa nor a polar. This object is currently in high state and would be an easy target for spectroscopy to determine the orbital period.

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[vsnet-newvar 9626] CRTSJ015051.5+332622 superoutburst continues
by Taichi Kato 09 Dec '22

09 Dec '22

CRTSJ015051.5+332622 superoutburst continues YYYYMMDD(UT) mag observer 20221124.5718 <159c (Yutaka Maeda) 20221126.5644 <161c (Yutaka Maeda) 20221202.5622 150c (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221207.5577 150:c (Yutaka Maeda)

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[vsnet-newvar 9625] MGAB-V279 brightening in standstill?
by Taichi Kato 09 Dec '22

09 Dec '22

MGAB-V279 brightening in standstill? (IW And star) YYYYMMDD(UT) mag observer 20221027.1552 15.902zg (ZTF Alert DC mag (Masci+ 2019)) 20221027.5353 150C (Masayuki Moriyama) 20221029.1246 15.995zg (ZTF Alert DC mag (Masci+ 2019)) 20221102.5423 <168C (Masayuki Moriyama) 20221103.5349 <168C (Masayuki Moriyama) 20221108.5131 150C (Masayuki Moriyama) 20221111.5189 150C (Masayuki Moriyama) 20221115.5229 149C (Masayuki Moriyama) 20221116.5020 <161C (Masayuki Moriyama) 20221119.5073 148C (Masayuki Moriyama) 20221124.4916 <165C (Masayuki Moriyama) 20221207.4238 146C (Masayuki Moriyama)

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[vsnet-newvar 9624] TCPJ05390410+4748030 outburst
by Taichi Kato 09 Dec '22

09 Dec '22

TCPJ05390410+4748030 outburst Last superoutburst (12 mag, WZ Sge star) in 2019 Mar. YYYYMMDD(UT) mag observer 20221202.6045 <163c (Yutaka Maeda) 20221205.6262 <154c (Yutaka Maeda) 20221206.5979 <151c (Yutaka Maeda) 20221207.6004 137c (Yutaka Maeda) 20221207.6004 137c (Yutaka Maeda) Noise? YYYYMMDD(UT) mag observer 20221012.7455 146c (Yutaka Maeda) 20221013.7517 <159c (Yutaka Maeda) 20221014.7306 <155c (Yutaka Maeda) 20221015.7432 <148c (Yutaka Maeda) 20221018.7468 <164c (Yutaka Maeda)

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[vsnet-newvar 9623] Wils_SDSSJ074859.55+312512.6 superoutburst
by Taichi Kato 06 Dec '22

06 Dec '22

Wils_SDSSJ074859.55+312512.6 superoutburst Knwon eclipsing SU UMa star. YYYYMMDD(UT) mag observer 20221121.7604 <158c (Yutaka Maeda) 20221124.7265 <152c (Yutaka Maeda) 20221126.7269 <156c (Yutaka Maeda) 20221202.878 167C (Mitsutaka Hiraga) 20221205.7440 160:c (Yutaka Maeda)

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[vsnet-newvar 9622] CRTSJ015051.5+332622 superoutburst
by Taichi Kato 06 Dec '22

06 Dec '22

CRTSJ015051.5+332622 superoutburst Knwon SU UMa star. YYYYMMDD(UT) mag observer 20221121.1785 18.813zg (ZTF Alert DC mag (Masci+ 2019)) 20221121.2163 18.182zr (ZTF Alert DC mag (Masci+ 2019)) 20221121.7121 <151c (Yutaka Maeda) 20221123.2127 18.274zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.2152 18.270zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.2386 17.961zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.2453 17.746zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.5591 <155c (Yutaka Maeda) 20221124.5718 <159c (Yutaka Maeda) 20221126.5644 <161c (Yutaka Maeda) 20221202.5622 150c (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda)

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[vsnet-newvar 9621] DDE 35: more likely a polar
by Taichi Kato 04 Dec '22

04 Dec '22

DDE 35: more likely a polar This object was classified as an SU UMa star based on superhump detection (vsnet-alert 24074). These humps, however, were seen only on two nights (2020 Mar. 16 and 18) and no humps were apparent on Mar. 19. The ZTF data show distinct high and low states unlike an SU UMa star (currently in bright state starting from late 2021). The magnitude (around 16) in 2020 Mar. was too faint (M_V=+6.6) for a superoutburst. The behavior suggests that the object is likely a polar. I have not been able to detect an orbital period in the ZTF data.

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