May 2023 - vsnet-chat - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-chat 9417] ASASSN-15si: another HT Cam-like object?
by Taichi Kato 30 May '23

30 May '23

ASASSN-15si: another HT Cam-like object? Rapidly fading outbursts only (ATLAS and others). Time-resolved photometry by Vanmunster on 2015 Nov. 3 recorded large-amplitude modulations with a scale of two hours superimposed on rapid fading.

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[vsnet-chat 9416] ASASSN-14hg: superoutbursts with multiple rebrightenings
by Taichi Kato 29 May '23

29 May '23

ASASSN-14hg: superoutbursts with multiple rebrightenings From ATLAS+ASAS-SN(DB). Typical one in 2021 June. Also in 2016 Sep. and 2017 Nov.-Dec. Too frequent for a WZ Sge star and rapid fading from rebrightenings suggest either EI Psc or AM CVn star.

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[vsnet-chat 9415] FH Lyn: (almost) overlooked rare outburst in early May
by Taichi Kato 29 May '23

29 May '23

FH Lyn: (almost) overlooked rare outburst in early May SS Cyg star, but this would be worth documenting. First known since 2020 Sep. YYYYMMDD(UT) mag observer 20230430.5377 <159c (Yutaka Maeda) 20230501.5478 <157c (Yutaka Maeda) 20230501.5755 <164C (Masayuki Moriyama) 20230502.2405 17.553o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.2437 17.752o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.2509 17.389o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.2647 17.575o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.2551 16.380o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.2579 16.389o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.2645 16.358o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.2768 16.394o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.3106 15.012o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.3144 14.954o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.3212 15.165o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.3316 14.981o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.1781 16.180zr (ZTF Alert DC mag (Masci+ 2019)) 20230509.5657 168C (Masayuki Moriyama) 20230510.4901 <160c (Yutaka Maeda) 20230514.2669 18.078c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2723 17.880c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2771 18.013c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.2968 18.145c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5088 <153c (Yutaka Maeda) 20230515.5047 <155c (Yutaka Maeda)

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[vsnet-chat 9414] Re: [VSS] V854 Cen Possible Decline Onset
by Cledison Marcos da Silva 27 May '23

27 May '23

Hi Daisaku. I can't log in to the site. I enter the login and password, it loads a page asking me to verify my email, but nothing arrives for me to log in and manage my subscriptions. My username is CledisonMarcosdaSilva. Enviado do Outlook para Android<https://aka.ms/AAb9ysg> ________________________________ From: Daisaku NOGAMI <nogami(a)kusastro.kyoto-u.ac.jp> Sent: Saturday, May 27, 2023 7:53:57 PM To: Cledison Marcos da Silva <Marcosdb2(a)outlook.com>; Peter Williams via vsnet-chat <vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp> Cc: vsnet-adm(a)ooruri.kusastro.kyoto-u.ac.jp <vsnet-adm(a)ooruri.kusastro.kyoto-u.ac.jp> Subject: Re: [vsnet-chat 9413] Re: [VSS] V854 Cen Possible Decline Onset Dear Marcos and Peter, Thank you very much for your continuous contributions to VSNET! The VSNET system has had NO trouble for these months, I think. Could you please let me know what the sub-ML you have not received e-mails? I will check it soon. With best regards, Daisaku Nogami --- Daisaku NOGAMI <nogami(a)kusastro.kyoto-u.ac.jp> On Sat, 27 May 2023 20:34:51 +0000 Cledison Marcos da Silva <Marcosdb2(a)outlook.com> wrote: > Hi Peter. My last observations of it were a little bit brighter than yours, but fainter than 7.5. Lets keep an eye on it. I don't know what happens with VSNET, i don't receive e-mail since some months. > > Enviado do Outlook para Android<https://aka.ms/AAb9ysg> > ________________________________ > From: 'Peter Williams' via Variable Stars South <VariableStarsSouth(a)googlegroups.com> > Sent: Saturday, May 27, 2023 4:02:26 AM > To: VariableStarsSouth(a)googlegroups.com <VariableStarsSouth(a)googlegroups.com> > Cc: 'vsnet rcb' <vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp>; vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp <vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp> > Subject: RE: [VSS] V854 Cen Possible Decline Onset > > > Hi Marcos, > > > > V854 Cen seems to have got stuck around magnitude 8.0, having shown no obvious variation since falling to that level on 08 May. It will be interesting to see if it recovers to normal maximum or, based on its 42 day pulsation cycle, continues into a deep fade from early July. We will just have to keep watching! > > > > Also, I have not seen anything from the VSNET since about 15 May, so they may be having email/communication problems. > > > > Tks and regards > > > > Peter Williams > > > > > > > > From: variablestarssouth(a)googlegroups.com [mailto:variablestarssouth@googlegroups.com] On Behalf Of Cledison Marcos da Silva > Sent: Friday, 19 May 2023 12:18 PM > To: VariableStarsSouth(a)googlegroups.com > Cc: vsnet rcb <vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp>; vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp > Subject: Re: [VSS] V854 Cen Possible Decline Onset > > > > Hi Peter. I've noticed her fluctuating a lot the last few days. I'll check in a little while and see how it is. Probably another decline is about to begin. > > > > Enviado do Outlook para Android<https://aka.ms/AAb9ysg> > > ________________________________ > > From: 'Peter Williams' via Variable Stars South <VariableStarsSouth(a)googlegroups.com<mailto:VariableStarsSouth@googlegroups.com>> > Sent: Thursday, May 18, 2023 9:59:45 PM > To: VariableStarsSouth(a)googlegroups.com<mailto:VariableStarsSouth@googlegroups.com> <VariableStarsSouth(a)googlegroups.com<mailto:VariableStarsSouth@googlegroups.com>> > Cc: vsnet rcb <vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp<mailto:vsnet-rcb@ooruri.kusastro.kyoto-u.ac.jp>>; vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp<mailto:vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp> <vsnet-chat(a)ooruri.kusastro.kyoto-u.ac.jp<mailto:vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp>> > Subject: [VSS] V854 Cen Possible Decline Onset > > > > Good morning, > > > > The bright southern RCB star V854 Cen has shown a gradual fading over the past 2 weeks, suggesting the possible onset of a deep decline may have commenced. This star was at visual magnitude 8.0 last night (May 18), a half magnitude below its normal maximum brightness. Typically, if it fades to magnitude 8.5 it will continue onto a deep decline. Observations over the next few days will confirm if this does indeed occur. The previous deep decline commenced in July 2022. Recent visual observations of V854 Cen: > > > > CEN V854 20230427.428 75 WPX > > CENV854 20230501.397 74 WPX > > CENV854 20230504.422 74 WPX > > CENV854 20230510.393 76 WPX > > CENV854 20230512.381 76 WPX > > CENV854 20230516.364 79 WPX > > CENV854 20230518.448 80 WPX > > > > Tks & regards > > Peter Williams > > Heathcote NSW > > 10x50mm binoculars > > > > -- > You received this message because you are subscribed to the Google Groups "Variable Stars South" group. > To unsubscribe from this group and stop receiving emails from it, send an email to VariableStarsSouth+unsubscribe(a)googlegroups.com<mailto:VariableStarsSouth+unsubscribe@googlegroups.com>. > To view this discussion on the web, visit https://groups.google.com/d/msgid/VariableStarsSouth/000001d989ed%2434edbb7…<https://groups.google.com/d/msgid/VariableStarsSouth/000001d989ed%2434edbb7…>. > > -- > You received this message because you are subscribed to the Google Groups "Variable Stars South" group. > To unsubscribe from this group and stop receiving emails from it, send an email to VariableStarsSouth+unsubscribe(a)googlegroups.com<mailto:VariableStarsSouth+unsubscribe@googlegroups.com>. > To view this discussion on the web, visit https://groups.google.com/d/msgid/VariableStarsSouth/CY5PR10MB6190CC6D1E409…<https://groups.google.com/d/msgid/VariableStarsSouth/CY5PR10MB6190CC6D1E409…>. > > -- > You received this message because you are subscribed to the Google Groups "Variable Stars South" group. > To unsubscribe from this group and stop receiving emails from it, send an email to VariableStarsSouth+unsubscribe(a)googlegroups.com<mailto:VariableStarsSouth+unsubscribe@googlegroups.com>. > To view this discussion on the web, visit https://groups.google.com/d/msgid/VariableStarsSouth/000901d99069%243314d77…<https://groups.google.com/d/msgid/VariableStarsSouth/000901d99069%243314d77…>.

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[vsnet-chat 9401] V854 Cen Possible Decline Onset
by Peter Williams 27 May '23

27 May '23

Good morning, The bright southern RCB star V854 Cen has shown a gradual fading over the past 2 weeks, suggesting the possible onset of a deep decline may have commenced. This star was at visual magnitude 8.0 last night (May 18), a half magnitude below its normal maximum brightness. Typically, if it fades to magnitude 8.5 it will continue onto a deep decline. Observations over the next few days will confirm if this does indeed occur. The previous deep decline commenced in July 2022. Recent visual observations of V854 Cen: CEN V854 20230427.428 75 WPX CENV854 20230501.397 74 WPX CENV854 20230504.422 74 WPX CENV854 20230510.393 76 WPX CENV854 20230512.381 76 WPX CENV854 20230516.364 79 WPX CENV854 20230518.448 80 WPX Tks & regards Peter Williams Heathcote NSW 10x50mm binoculars

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[vsnet-chat 9411] CRTS J170208.5+551826: another HT Cam-like object (IP?)
by Taichi Kato 26 May '23

26 May '23

CRTS J170208.5+551826: another HT Cam-like object (IP?) Very rapid fading from outbursts (ZTF+ATLAS). Short low states in quiescence. IP?

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[vsnet-chat 9410] 6dFg2044559-115154 = ASASSN-14ds: UG+IP?
by Taichi Kato 26 May '23

26 May '23

6dFg2044559-115154 = ASASSN-14ds: UG+IP? Rapid fading near termination of outbursts (ATLAS+ZTF) similar to HT Cam. Also X-ray bright.

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[vsnet-chat 9409] ASASSN-16pr: SU UMa star
by Taichi Kato 25 May '23

25 May '23

ASASSN-16pr: SU UMa star From ATLAS data. Superoutburst + rebrightening in 2023 Jan. Other superoutbursts in 2019 Mar. and 2020 Oct.

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[vsnet-chat 9408] Re: ELAISN1MOS15-02 classification and period
by Taichi Kato 24 May '23

24 May '23

> SDSS J182643.55+613816.5 is the already known object > MASTER OT J182643.42+613816 (SU UMa). -> MASTER OT J182643.42+613816.2

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[vsnet-chat 9407] ELAISN1MOS15-02 classification and period
by Taichi Kato 24 May '23

24 May '23

ELAISN1MOS15-02 classification and period https://arxiv.org/abs/2305.13371 "Cataclysmic Variables from Sloan Digital Sky Survey V -- the search for period bouncers continues" I could not confirm the claimed period for ELAISN1 MOS15-02 = SDSS J160809.54+542131.4. The fading rates of outbursts appear to me to small for the claimed period. This object is still a mystery one to me. SDSS J182643.55+613816.5 is the already known object MASTER OT J182643.42+613816 (SU UMa).

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