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

[vsnet-campaign-dn 16469] VY Aqr superhumps
by Taichi Kato 11 Jul '22

11 Jul '22

VY Aqr superhumps Kiyota-san detected superhumps on July 10. The object was fading on July 8 (precursor). Relatively slow rise, atypical for an SU UMa star. YYYYMMDD(UT) mag observer 20220704.9833 <138 (Eddy Muyllaert) 20220705.9819 <138 (Eddy Muyllaert) 20220707.9896 122 (Eddy Muyllaert) 20220708.0326 118 (Eddy Muyllaert) 20220708.989 10.88C (Gary Poyner) 20220709.7449 105cG (Yutaka Maeda) 20220709.7759 110C (Masayuki Moriyama) 20220709.958 10.81C (Gary Poyner) 20220710.0028 105 (Eddy Muyllaert) 20220710.0432 10.66C (Masao Funada) 20220710.049 105 (Gary Poyner) 20220710.7151 109C (Masayuki Moriyama) 20220710.940 11.24C (Gary Poyner)

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[vsnet-campaign-dn 16468] Re: TCP J22561804+4109534: new WZ Sge-type dwarf nova
by Taichi Kato 05 Jul '22

05 Jul '22

> The superhump profile shows no signs of a double-waved pattern, and I could > not detect early superhumps in my data. Yet, the large outburst amplitude of > ~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make > this a very likely WZ Sge-type dwarf nova. It would be worth noting that the period 0.065 d is long for a WZ Sge star. If this is indeed a WZ Sge star, it must be a period bouncer. Period bouncers tend to have smaller amplitudes of ordinary superhumps and 0.14 mag seems to be a bit large. I would propose to assign the WZ Sge classification after confirmation of a small Pdot and/or rebrightenings.

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[vsnet-campaign-dn 16466] ASASSN-20pv (AM CVn) switching on and off
by Taichi Kato 04 Jul '22

04 Jul '22

ASASSN-20pv (AM CVn) switching on and off Still shows post-superoutburst activity. YYYYMMDD(UT) mag observer 20220621.426 143 (Rod Stubbings) 20220621.458 145 (Rod Stubbings) 20220627.469 154 (Rod Stubbings) 20220628.428 154 (Rod Stubbings) 20220630.399 156 (Rod Stubbings) 20220630.492 154 (Rod Stubbings) 20220702.503 154 (Rod Stubbings) 20220703.449 148 (Rod Stubbings) 20220703.499 145 (Rod Stubbings)

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[vsnet-campaign-dn 16465] Re: ASASSN-14gq likely superoutburst
by Taichi Kato 04 Jul '22

04 Jul '22

Re: ASASSN-14gq likely superoutburst Faded rapidly. YYYYMMDD(UT) mag observer 20220702.491 143 (Rod Stubbings) 20220703.471 155 (Rod Stubbings)

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[vsnet-campaign-dn 16464] ASASSN-14gq likely superoutburst
by Taichi Kato 03 Jul '22

03 Jul '22

ASASSN-14gq likely superoutburst YYYYMMDD(UT) mag observer 20220702.491 143 (Rod Stubbings)

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[vsnet-campaign-dn 16463] CRTS J202857.1-061803 likely superoutburst
by Taichi Kato 03 Jul '22

03 Jul '22

CRTS J202857.1-061803 likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20220615.4097 <164C (Masao Funada) 20220626.1150 151cG (Masao Funada) 20220629.7143 152:cG (Yutaka Maeda) 20220630.7076 153:cG (Yutaka Maeda) 20220701.2036 158cG (Masao Funada)

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[vsnet-campaign-dn 16462] ASASSN-18su superhump period
by Taichi Kato 03 Jul '22

03 Jul '22

ASASSN-18su superhump period Berto Monard, Josch Hambsch and Itoh-san have reported observations. The superhump period is 0.05815(2) d. The amplitude is large (0.23 mag). Ordinary SU UMa star.

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[vsnet-campaign-dn 16461] Re: ASASSN-18su
by Taichi Kato 28 Jun '22

28 Jun '22

Re: ASASSN-18su Superhumps were already detected during the 2018 superoutburst by Berto Monard. Superhumps appeared on 2018 Aug. 25. Due to the short visibility, the period was not determined.

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[vsnet-campaign-dn 16459] ASASSN-18su (super?)outburst (since June 24)
by Patrick Schmeer 28 Jun '22

28 Jun '22

ASASSN-18su (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=623474 ASASSN-18su was discovered on 2018 August 17. Unfortunately that outburst could be followed for only few days. After the seasonal gap a very long fading tail can be seen in ATLAS forced photometry data. T. Kato wrote (vsnet-alert 22429): "The Gaia proper motion is comparable to that of OV Boo ... ASASSN-18su looks likely a population II CV candidate." The current outburst was detected by Rod Stubbings at mv= 11.3 on 2022 June 28.537 UT (vsnet-outburst 28822, vsnet-alert 26852). It had already started on June 24 and is 1.5 magnitudes fainter than the 2018 outburst according to ASAS-SN Sky Patrol data: https://asas-sn.osu.edu/sky-patrol/coordinate/52d16cd1-3548-431f-a7fc-326e3… Time-resolved photometry is urgently required. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T

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[vsnet-campaign-dn 16458] QZ Vir (= T Leo) superoutburst (since June 21)
by Patrick Schmeer 28 Jun '22

28 Jun '22

QZ Virginis = T Leonis (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=17034 Outburst first detected on 2022 June 22.981 UT at V= 10.36 by Carlos Colesanti (CCT): https://app.aavso.org/webobs/results/?star=000-BBS-294 Observed on June 28.424 UT at mv= 10.4 by Rod Stubbings (vsnet-outburst 28822). Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/c371f339-8e10-448c-98f5-e234f… The current superoutburst started on 2022 June 20 or 21. A normal outburst was observed from 2022 Jan. 31 to Feb. 3. Clear skies, Patrick

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