December 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16709] ASASSN-15ui rebrightening
by Taichi Kato 06 Dec '22

06 Dec '22

ASASSN-15ui rebrightening YYYYMMDD(UT) mag observer 20221113.3896 14.918zg (ZTF Alert DC mag (Masci+ 2019)) 20221115.4250 15.071zg (ZTF Alert DC mag (Masci+ 2019)) 20221119.4016 15.706zg (ZTF Alert DC mag (Masci+ 2019)) 20221119.7185 15.80C (Masayuki Moriyama) 20221121.7420 158C (Masayuki Moriyama) 20221123.3533 15.926zg (ZTF Alert DC mag (Masci+ 2019)) 20221126.8448 <171C (Masayuki Moriyama) 20221202.7201 <179C (Masayuki Moriyama) 20221205.6945 168C (Masayuki Moriyama)

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[vsnet-campaign-dn 16708] ASASSN-15cr superoutburst
by Taichi Kato 06 Dec '22

06 Dec '22

ASASSN-15cr superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221115.7501 <157c (Yutaka Maeda) 20221121.7529 <153c (Yutaka Maeda) 20221123.610 <175C (Mitsutaka Hiraga) 20221124.7191 <154c (Yutaka Maeda) 20221126.7194 151:c (Yutaka Maeda) 20221126.7194 151:c (Yutaka Maeda) 20221130.592 151C (Mitsutaka Hiraga) 20221202.833 151C (Mitsutaka Hiraga) 20221205.7339 152cG (Yutaka Maeda) 20221205.7339 152cG (Yutaka Maeda)

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[vsnet-campaign-dn 16707] 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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[vsnet-campaign-dn 16706] ASASSN-13bz: SU UMa star (or even WZ Sge)
by Taichi Kato 04 Dec '22

04 Dec '22

ASASSN-13bz: SU UMa star (or even WZ Sge) Itoh-san detected superhumps on Dec. 3 (amplitude 0.12 mag). The period from single-night baseline is 0.059(1) d. I suspected this object to be an SS Cyg star based on the initial fading rate (0.2-0.4 mag/d) and the lack of superhumps, but this may have been a viscous decay phase of a WZ Sge star (considering the rarity of outbursts). Early superhumps may have not been present simply based on a low inclination.

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[vsnet-campaign-dn 16705] ZTF22abteqxm: rapid fading from superoutburst
by Taichi Kato 03 Dec '22

03 Dec '22

ZTF22abteqxm: rapid fading from superoutburst YYYYMMDD(UT) mag observer 20221126.6388 168C (Masayuki Moriyama) 20221128.2014 16.925zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.1529 18.921zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.2202 19.080zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-campaign-dn 16703] CRTS J220449.8+054852 superhump period
by Taichi Kato 03 Dec '22

03 Dec '22

CRTS J220449.8+054852 superhump period Tonny Vanmunster and Itoh-san have reported observations. The superhump period from these observations was 0.0948(1) d, slightly shorter than reported in [vsnet-alert 27150]. Large superhump amplitude. (Dear Tonny, your messages were again under "ASASSN-22ho: new SU UMa-type dwarf nova").

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[vsnet-campaign-dn 16702] ASASSN-13bz: no apparent superhumps
by Taichi Kato 03 Dec '22

03 Dec '22

ASASSN-13bz: no apparent superhumps Itoh-san and Tonny Vanmunster have reported observations. No apparent superhumps were recorded. This object appears to be an SS Cyg star.

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[vsnet-campaign-dn 16701] Gaia21fgn: long fading tail
by Taichi Kato 01 Dec '22

01 Dec '22

Gaia21fgn: long fading tail AM CVn star? YYYYMMDD(UT) mag observer 20220921.5188 19.038zr (ZTF Alert DC mag (Masci+ 2019)) 20220927.5071 19.079zr (ZTF Alert DC mag (Masci+ 2019)) 20220927.5120 19.063zr (ZTF Alert DC mag (Masci+ 2019)) 20220930.5089 18.962zr (ZTF Alert DC mag (Masci+ 2019)) 20220930.5140 19.146zr (ZTF Alert DC mag (Masci+ 2019)) 20220930.5191 19.160zr (ZTF Alert DC mag (Masci+ 2019)) 20221006.5101 19.174zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-campaign-dn 16700] ASASSN-VJ000122.44+481658.1 stopped fading
by Taichi Kato 01 Dec '22

01 Dec '22

ASASSN-VJ000122.44+481658.1 stopped fading Entering a standstill?x YYYYMMDD(UT) mag observer 20221105.2897 15.679zr (ZTF Alert DC mag (Masci+ 2019)) 20221111.2710 15.292zr (ZTF Alert DC mag (Masci+ 2019)) 20221113.1855 15.206zg (ZTF Alert DC mag (Masci+ 2019)) 20221113.2618 15.382zr (ZTF Alert DC mag (Masci+ 2019)) 20221115.2063 15.259zg (ZTF Alert DC mag (Masci+ 2019)) 20221115.2581 15.466zr (ZTF Alert DC mag (Masci+ 2019)) 20221117.2062 15.492zg (ZTF Alert DC mag (Masci+ 2019)) 20221117.6044 15.57C (Masayuki Moriyama) 20221119.1634 15.845zr (ZTF Alert DC mag (Masci+ 2019)) 20221119.2817 15.724zg (ZTF Alert DC mag (Masci+ 2019)) 20221119.7136 159C (Masayuki Moriyama) 20221121.1981 15.996zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.1544 16.624zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.2016 16.631zg (ZTF Alert DC mag (Masci+ 2019)) 20221126.6398 167C (Masayuki Moriyama)

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[vsnet-campaign-dn 16699] ASASSN-15cr superoutburst
by Taichi Kato 01 Dec '22

01 Dec '22

ASASSN-15cr superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221121.7529 <153c (Yutaka Maeda) 20221123.610 <175C (Mitsutaka Hiraga) 20221124.7191 <154c (Yutaka Maeda) 20221126.7194 151:c (Yutaka Maeda) 20221126.7194 151:c (Yutaka Maeda) 20221130.592 151C (Mitsutaka Hiraga)

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vsnet-campaign-dn December 2022