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

[vsnet-alert 27781] CH Her: indeed SU UMa star
by Taichi Kato 26 May '23

26 May '23

CH Her: indeed SU UMa star Tamas Tordai has reported observations and detected superhumps (period about 0.075 d).

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[vsnet-alert 27780] ASASSN-16mi possible superoutburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-16mi possible superoutburst Type from ZTF+ATLAS. Faint superoutburst? YYYYMMDD(UT) mag observer 20230509.2645 <17.076g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.2645 <17.407g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.4399 <17.166g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.5365 18.841o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5415 18.756o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5474 18.590o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5714 16.432o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5756 16.479o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230520.626 171C (Mitsutaka Hiraga) 20230522.5366 17.022o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5389 16.974o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5517 17.076o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5595 17.006o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5531 17.023o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5549 17.121o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5580 17.017o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27779] ASASSN-16lh outburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-16lh outburst Long and short outbursts (long one presently). Amplitude too small for an SU UMa star? YYYYMMDD(UT) mag observer 20230507.4281 <16.779g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.1149 18.371o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.1195 18.635o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.1254 18.462o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.4227 <17.029g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.4188 16.740g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.4145 17.266g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230513.4139 16.394g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.4096 17.473g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230514.4096 17.493g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230515.4356 <16.397g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230516.4280 16.425g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.4082 16.861g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230519.3911 16.184o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230519.3929 17.303o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4065 <16.721g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27778] Gaia DR3 2893005857946801152 = ASASSN-23dr: superhump period
by Taichi Kato 25 May '23

25 May '23

Gaia DR3 2893005857946801152 = ASASSN-23dr: superhump period Berto Monard and Josch Hambsch have reported further observations. Thanks to Monard's high-cadence data, it has become apparent that ordinary superhumps started to appear on May 19. Due the the gap in the observation, I analyzed the data since May 22 and obtained a superhump period of 0.0580(1) d (amplitude 0.10 mag and the existence of superhumps is unambiguous). I could not detect early superhumps corresponding to this period, but as I already reported, this object appears to be a WZ Sge star.

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[vsnet-alert 27777] ASASSN-22ak period
by Taichi Kato 25 May '23

25 May '23

ASASSN-22ak period Josch Hambsch has reported further observations. Thanks to the recent high-cadence data, the period has been established. The object brightened a bit on May 21 and the period since then has been 0.04292(2) d. Based on this alias selection, the period from the entire data is 0.043032(4) d. The profile still never appeared to be typical superhump-like. It has been fast rising and slower fading, as in early superhumps. The amplitude is 0.04 mag. The observations appear to confirm the classification of the object as being below the period minimum (EI Psc star).

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[vsnet-alert 27776] Gaia DR3 4538714906329565952 = ZTF23aaladoy outburst
by Taichi Kato 25 May '23

25 May '23

Gaia DR3 4538714906329565952 = ZTF23aaladoy outburst Fading too rapidly for a superoutburst? YYYYMMDD(UT) mag observer 20230521.5006 15.905o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5024 15.928o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5063 15.932o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.5122 15.924o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6066 16.246o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6098 16.270o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6130 16.303o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.7678 165V (Masayuki Moriyama) 20230523.7688 16.43C (Masayuki Moriyama)

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[vsnet-alert 27775] ASASSN-13bs outburst
by Taichi Kato 25 May '23

25 May '23

ASASSN-13bs outburst Subtype unknown. Rather strange behavior in the past. YYYYMMDD(UT) mag observer 20230513.6041 <167C (Masayuki Moriyama) 20230514.599 175C (Mitsutaka Hiraga) 20230514.7266 <163C (Masayuki Moriyama) 20230514.7332 <149c (Yutaka Maeda) 20230515.6956 <145c (Yutaka Maeda) 20230519.7000 <162c (Yutaka Maeda) 20230520.576 175C (Mitsutaka Hiraga) 20230523.7797 144C (Masayuki Moriyama)

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[vsnet-alert 27774] CH Her likely superoutburst
by Taichi Kato 25 May '23

25 May '23

CH Her likely superoutburst Time-resolved photometry is strongly encouraged. Not done before. (ZTF and ATLAS data suggest an SU UMa star, as previously reported) YYYYMMDD(UT) mag observer 20230515.597 <175C (Mitsutaka Hiraga) 20230515.6874 <151c (Yutaka Maeda) 20230516.5026 16.842g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230516.6808 <144c (Yutaka Maeda) 20230519.6916 <141c (Yutaka Maeda) 20230521.4021 14.456g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230522.5081 14.468g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230523.7832 149C (Masayuki Moriyama)

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[vsnet-alert 27773] Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star
by Taichi Kato 24 May '23

24 May '23

Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star Josch Hambsch has reported further observations. There was an apparent superhump on May 22-23. As judged from the outburst light curve, the object probably entered the phase of ordinary superhumps (but there was a gap in the data). The initial rapid decay and the waiting time suggest a WZ Sge star.

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[vsnet-alert 27772] V592 Her superoutburst, recent data
by Taichi Kato 24 May '23

24 May '23

V592 Her superoutburst, recent data Apparently in SU UMa mode (superoutburst in 2021 Dec.). Quiescence has become brighter (ZTF data). Itoh-san already detected superhump-like modulations. YYYYMMDD(UT) mag observer 20230518.1626 <18.162g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.4078 <18.399g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230518.9549 <142 (Eddy Muyllaert) 20230519.6030 <144c (Yutaka Maeda) 20230521.022 <153 (Gary Poyner) 20230521.1861 15.227g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230521.4146 16.026o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4209 15.989o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4232 16.011o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4469 16.005o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230521.4696 15.395g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230522.008 <149 (Gary Poyner) 20230522.4398 16.024g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230522.989 15.10 (Pavol A. Dubovsky) 20230523.026 15.17 (Pavol A. Dubovsky) 20230523.1519 15.120g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230523.5219 15.609o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5255 15.620o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.5333 15.588o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230523.6072 150:c (Yutaka Maeda)

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