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

[vsnet-alert 26895] ASASSN-13ce
by Taichi Kato 04 Aug '22

04 Aug '22

ASASSN-13ce SU UMa star. YYYYMMDD(UT) mag observer 20220726.8095 <161c (Yutaka Maeda) 20220802.7828 145:cG (Yutaka Maeda)

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[vsnet-alert 26893] SY Cap superoutburst
by Taichi Kato 04 Aug '22

04 Aug '22

SY Cap superoutburst YYYYMMDD(UT) mag observer 20220721.8118 <158C (Masayuki Moriyama) 20220722.7656 <171C (Masayuki Moriyama) 20220725.7520 <172C (Masayuki Moriyama) 20220726.5735 <158c (Yutaka Maeda) 20220728.7723 173:C (Masayuki Moriyama) 20220802.5132 131cG (Yutaka Maeda) 20220802.5132 131cG (Yutaka Maeda) 20220803.421 128 (Rod Stubbings)

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[vsnet-alert 26891] MASTER OT J001204.00-412337.4: superhump period
by Taichi Kato 04 Aug '22

04 Aug '22

MASTER OT J001204.00-412337.4: superhump period Josch Hambsch and Berto Monard have reported new observations. The current superhump period is 0.06105(6) d (probably still stage A). The low amplitude (0.08 mag) is consistent with a period bouncer. Single-night observation by Berto Monard during the initial plateau did not show a strong signature of early superhumps (but had some hint). Early superhumps had probably already decayed at the time of Monard's observation.

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[vsnet-alert 26890] Re: MASTER OT J001204.00-412337.4: new SU UMa-type dwarf nova
by Taichi Kato 02 Aug '22

02 Aug '22

Re: MASTER OT J001204.00-412337.4: new SU UMa-type dwarf nova > According to ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and > Kochanek et al. 2017PASP..129j4502K) data the current superoutburst started > on (or shortly before) 2022 July 16. A dip was recorded (also by > Josch Hambsch, HMB) from July 28 to 30: Then looks likely a period-bouncer WZ Sge star. ASASSN-16hg: https://ui.adsabs.harvard.edu/abs/2018PASJ...70...47K/abstract ASASSN-15jd: https://ui.adsabs.harvard.edu/abs/2016PASJ...68...55K/abstract

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[vsnet-alert 26888] MASTER OT J001204.00-412337.4: new SU UMa-type dwarf nova
by Taichi Kato 01 Aug '22

01 Aug '22

MASTER OT J001204.00-412337.4: new SU UMa-type dwarf nova Josch Hambsch has reported observations on three nights. The object was faint (17 mag) on July 29 and was rising rapidly on July 30 (with superhumps). Superhumps were apparent on July 31 at mag 14.9. The period is about 0.063 d.

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[vsnet-alert 26887] Re: [VSS] V0854 CEN fading? and S Aps possible fade
by Peter Williams 30 Jul '22

30 Jul '22

Hi Marcos and All, As noted below, the RCB star V854 Cen may have commenced to decline (10x50mm binoculars): CENV854 20220717.386 74 WPX CENV854 20220724.420 73 WPX CENV854 20220727.410 74 WPX CENV854 20220728.432 75 WPX CENV854 20220730.368 81 WPX Also, the RCB star S Aps is also fainter than usual tonight and may have commenced to decline (20x80mm binoculars): APSS 20220717.418 95 WPX APSS 20220724.465 97 WPX APSS 20220727.454 97 WPX APSS 20220728.403 96 WPX APSS 20220730.429 100 WPX Further observations will confirm if either or both of these stars continue into a deep decline. Tks and regards Peter Williams Heathcote NSW From: 'Peter Williams' via Variable Stars South [mailto:VariableStarsSouth@googlegroups.com] Sent: Saturday, 30 July 2022 5:37 PM To: VariableStarsSouth(a)googlegroups.com Subject: RE: [VSS] V0854 CEN fading? Hi Marcos, V854 Cen is perhaps the most active of the RCB stars and would seem ready for a deep decline, if not overdue. I have noticed its SR variations having a marginally greater amplitude during June and July and that has in previous cases led to a decline onset. My most recent observation was on Thursday, July 28.432UT at magnitude 7.5. That is marginally fainter than usual and with your most recent magnitude of 7.9, it may well indicate the onset of a decline. It will sometimes stall near magnitude 8 and return to maximum but if it goes below magnitude 8.5 then a deep decline is most likely underway. Hopefully the twilight clouds will clear tonight! Tks and regards Peter Williams From: variablestarssouth(a)googlegroups.com <mailto:variablestarssouth@googlegroups.com> [mailto:variablestarssouth@googlegroups.com] On Behalf Of Marcos Silva Sent: Saturday, 30 July 2022 8:03 AM To: Variable Stars South <VariableStarsSouth(a)googlegroups.com <mailto:VariableStarsSouth@googlegroups.com> > Subject: [VSS] V0854 CEN fading? Dear VSS friends, last night i observed the RCB star V0854 Cen fainter than the comparison star of mag 7.5. I have observed it here again now and estimated the magnitude of 7.9, we have some cirrus here at the moment, so the star could be a little bit brighter (7.8 or 7.7). But it is still fainter than 7.5 and brighter than 8.2. I'm warning you because this could be the beginning of a fading of the star. -- 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/fac2f5ce-2d73-4872-bd5… <https://groups.google.com/d/msgid/VariableStarsSouth/fac2f5ce-2d73-4872-bd5…> . -- 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/000001d8a3e7%2420fb1b9… <https://groups.google.com/d/msgid/VariableStarsSouth/000001d8a3e7%2420fb1b9…> .

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[vsnet-alert 26886] Re: Var Ret 2005 likely superoutburst
by Taichi Kato 29 Jul '22

29 Jul '22

> This long outburst began between 2022 July 16 and 21. It was > observed at mag. 13 for five days, followed by a rapid fading > on July 27. The outburst was considerably longer than short > outbursts of this dwarf nova, but shorter than standard UGSU > superoutbursts (~14 days). Might be an EI Psc star, although the peak M_V is not too faint.

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[vsnet-alert 26885] Var Ret 2005 likely superoutburst
by Patrick Schmeer 28 Jul '22

28 Jul '22

Variable Reticuli 2005 (UGSU:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=161100 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/38d59ff4-1572-40ef-a0c5-e280e… This long outburst began between 2022 July 16 and 21. It was observed at mag. 13 for five days, followed by a rapid fading on July 27. The outburst was considerably longer than short outbursts of this dwarf nova, but shorter than standard UGSU superoutbursts (~14 days). Regards, Patrick

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[vsnet-alert 26884] MASTER OT J001204.00-412337.4: possible WZ Sge star
by Taichi Kato 26 Jul '22

26 Jul '22

MASTER OT J001204.00-412337.4: possible WZ Sge star https://www.wis-tns.org/object/2022pel ASAS-SN data: https://asas-sn.osu.edu/sky-patrol/coordinate/de867b05-f575-4a12-abde-cbb71…

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[vsnet-alert 26883] TCP J22561804+4109534 rebrightenings
by Taichi Kato 26 Jul '22

26 Jul '22

TCP J22561804+4109534 rebrightenings Tamas Tordai has reported further observations. Five rebrightenings have been recorded up to July 24. The amplitudes, however, are decreasing and frequent small-amplitude rebrightenings resemble those of WZ Sge. This phenomenon is atypical for this orbital period.

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