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

[vsnet-rcb 887] V854 Cen Apparent Decline
by Peter Williams 11 Apr '25

11 Apr '25

The bright southern RCB star V854 Cen appears to have commenced a decline as per the following visual observations: CENV854 20250312.780 74 WPX 10x50mm CENV854 20250402.445 80 WPX 10x50mm CENV854 20250411.465 93 WPX 20x80mm Full Moon Tks and regards Peter Williams Heathcote NSW

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[vsnet-rcb 886] V854 Cen Possible Fade
by Peter Williams 30 Sep '24

30 Sep '24

The RCB star V854 Cen has just recovered from a deep decline that lasted from January through July 2024. During September 2024 it gradually faded again to visual magnitude 8.1, but it is not clear if this is the onset of another deep decline. It has been cloudy for the past week here at Heathcote NSW , so I have been unable to confirm the current state of V854 Cen. A check on this star would be appreciated - thanks. Recent visual observations : CENV854 20240923.381 81 WPX CENV854 20240922.403 81 WPX CENV854 20240921.398 80 WPX CENV854 20240920.370 80 WPX CENV854 20240919.397 80 WPX CENV854 20240918.393 76 WPX CENV854 20240915.398 76 WPX CENV854 20240913.390 74 WPX CENV854 20240909.440 74 WPX CENV854 20240906.384 76 WPX CENV854 20240905.383 74 WPX CENV854 20240904.404 74 WPX CENV854 20240902.401 74 WPX CENV854 20240901.454 74 WPX CENV854 20240831.374 75 WPX Tks and regards Peter Williams Heathcote NSW 10x50mm binoculars

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[vsnet-rcb 885] V854 Cen Below Maximum Brightness
by Peter Williams 11 Oct '23

11 Oct '23

The southern RCB star V854 Cen has again faded to about 1 magnitude below its usual maximum brightness and, based on its history of being one of the more active RCB stars, would seem to be overdue for a deep decline. The last deep but brief decline commenced in 2022 July. V854 Cen is, however, now becoming difficult to observe as it approaches conjunction with the sun. Recent visual observations : CENV854 20230915.437 73 WPX CENV854 20230918.411 74 WPX CENV854 20231008.416 79 WPX CENV854 20231009.426 81 WPX CENV854 20231011.388 82 WPX Tks and regards Peter Williams Heathcote NSW 10x50mm & 20x80mm binoculars

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[vsnet-rcb 884] AO Her in 2021 and anomaly in visual observations
by Taichi Kato 20 Jul '23

20 Jul '23

AO Her in 2021 and anomaly in visual observations Prompted by BAA VSS Circular No. 196, I checked the past light curve of the R CrB star AO Her. The observations by two most prominent visual observers around the 2021 fading did not agree at all with CCD observations. They (and also Jose Ripero, as I suggested in vsnet-alert regarding other objects) didn't notice the start of the July-Aug. fading for more than two weeks. They reported unreal fading in Apr.-June. They also didn't notice the brightening in the later half of 2020. The reported values, however, agreed very well between these observers (but no correlation with CCD observations). A naive interpretation of this strange phenomenon would be that these observers were copying other persons' observations each other. They were not correlated with actual variations and researchers should pay attention when using any database (e.g. AAVSO) containing observations of these observers. Of course, I had noticed the sign from the past (already in 1996 in V705 Cas, which was interpreted as a "telephone effect" by Gary Poyner if I remember correctly), but the present case and other cases are too apparent with sufficient evidence in the presence of modern CCD data.

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[vsnet-rcb 883] Re: NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst?
by Taichi Kato 09 Jul '23

09 Jul '23

Re: NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst? The object turned out to be an R CrB star. https://www.aavso.org/vsx/index.php?view=detail.top&oid=59625 https://ui.adsabs.harvard.edu/abs/2020A%26A...635A..14T/abstract Relatively periodic behavior in 2017-2020 would suggest the pulsation origin like DY Per stars.

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[vsnet-rcb 882] ES Aql fading
by Taichi Kato 20 Jun '23

20 Jun '23

ES Aql fading YYYYMMDD(UT) mag observer 20230307.8541 117:cG (Yutaka Maeda) 20230421.7890 119cG (Yutaka Maeda) 20230430.6832 120cG (Yutaka Maeda) 20230515.6804 121cG (Yutaka Maeda) 20230523.6556 123cG (Yutaka Maeda) 20230619.5552 13.25V (Minoru Sato)

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[vsnet-rcb 881] Re: [VSS] RCB Star IO Nor is undergoing a decline & [VSS] RCB star V653 Sco is undergoing a decline
by Peter Williams 05 Jun '23

05 Jun '23

Hi Andrew, Great to see someone keeping a regular watch on these southern RCB stars! CC to the vsnet-rcb and vsnet-alert groups for info, but I cannot remember if they accept the light curve attachments :) Tks and regards Peter Williams Heathcote NSW From: variablestarssouth(a)googlegroups.com [mailto:variablestarssouth@googlegroups.com] On Behalf Of Andrew Pearce Sent: Monday, 5 June 2023 11:15 AM To: Variable Stars South <VariableStarsSouth(a)googlegroups.com> Subject: [VSS] RCB Star IO Nor is undergoing a decline Hi All Another little observed RCB star, IO Nor, is undergoing a decline as per the attached light curve. Regards Andrew = = = = = = = = = = = = = = = = = = = = From: variablestarssouth(a)googlegroups.com [mailto:variablestarssouth@googlegroups.com] On Behalf Of Andrew Pearce Sent: Monday, 5 June 2023 10:45 AM To: Variable Stars South <VariableStarsSouth(a)googlegroups.com> Subject: [VSS] RCB star V653 Sco is undergoing a decline Hi All The little observed RCB star, V653 Sco, is undergoing a decline as can be seen from the attached light curve. Years ago, professional astronomers used to be very interested in RCB fades. That doesn't seem to be the case anymore at least that I'm aware of. Regards Andrew = = = = = = = = = = = = = = = = = = = = -- 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/e7b14d23-70f2-4b8d-96f… <https://groups.google.com/d/msgid/VariableStarsSouth/e7b14d23-70f2-4b8d-96f…> .

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[vsnet-rcb 880] R CrB fading?
by Taichi Kato 02 Jun '23

02 Jun '23

R CrB fading? Several observers have pointed out that R CrB may be getting fainter. YYYYMMDD(UT) mag observer 20230518.9063 60 (Eddy Muyllaert) 20230519.744 61 (Susumu Takahashi) 20230520.542 60 (Susumu Takahashi) 20230520.567 61 (Yoshiyasu Sato) 20230521.008 60 (Gary Poyner) 20230521.985 59 (Gary Poyner) 20230523.001 59 (Gary Poyner) 20230523.544 60 (Hiroyuki Maehara) 20230523.565 64 (Kenji Nakai) 20230523.606 61 (Yoshiyasu Sato) 20230524.019 60 (Gary Poyner) 20230524.485 63 (Tsuneo Horie) 20230524.508 61 (Masashi Nakatani) 20230524.585 61 (Yoshiyasu Sato) 20230524.944 60 (Gary Poyner) 20230525.510 60 (Hiroyuki Maehara) 20230525.581 61 (Yoshiyasu Sato) 20230526.990 60 (Gary Poyner) 20230527.442 65 (Tsuneo Horie) 20230527.978 62 (Gary Poyner) 20230528.965 64 (Gary Poyner) 20230529.8785 62 (Jose Ripero) 20230529.951 64 (Gary Poyner) 20230530.492 61 (Yoshiyasu Sato) 20230531.535 62 (Yoshiyasu Sato) 20230531.597 64 (Masashi Nakatani) 20230531.867 66 (Klaus Wenzel)

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[vsnet-rcb 875] 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-rcb 877] Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading
by Taichi Kato 21 May '23

21 May '23

Gaia DR3 5931782154434729600 = Gaia23bt: likely RCB star fading http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23btd/ Non-red and luminious object. Consistent with RCB. 2MASS 161615.906 -544445.35 (2000.0) 12.495 12.134 11.774 161615.9 -544445 (2000.0) Gaia_DR3_5931782154434729600 RS (score=0.01) 161615.931 -544445.47 (2000.0) Gaia_DR2_5931782154434729600 plx=0.015(0.032) dismod=19.2 pmra=-2.920(0.052) pmdec=-2.724(0.041) G=14.549 BP=15.236 RP=13.707 161615.930 -544445.47 (2000.0) Gaia_EDR3_5931782154434729600 plx=0.021(0.024) dismod=18.4 pmra=-2.885(0.028) pmdec=-2.745(0.021) G=14.538 BP=15.214 RP=13.699

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[vsnet-rcb 874] SU Tau started fading?
by Taichi Kato 02 Apr '23

02 Apr '23

SU Tau started fading? Sato-san has pointed out the gradual fading. YYYYMMDD(UT) mag observer 20230318.8813 100 (Eddy Muyllaert) 20230319.439 105 (Takuichiro Onishi) 20230319.4497 10.13V (Minoru Sato) 20230319.549 101 (Yoshiyasu Sato) 20230319.8153 99 (Jose Ripero) 20230320.4490 10.18V (Minoru Sato) 20230321.8132 101 (Eddy Muyllaert) 20230325.4272 10.35V (Minoru Sato) 20230326.5031 103cG (Yutaka Maeda) 20230326.5736 104V (Masayuki Moriyama) 20230327.4096 10.52V (Minoru Sato) 20230327.8340 100 (Eddy Muyllaert) 20230328.4183 10.55V (Minoru Sato) 20230328.5680 105V (Masayuki Moriyama) 20230329.4157 10.59V (Minoru Sato) 20230329.8438 100 (Eddy Muyllaert) 20230330.4337 10.66V (Minoru Sato) 20230330.451 104 (Tsuneo Horie) 20230331.437 104 (Tsuneo Horie) 20230331.465 107 (Hiroyuki Maehara) 20230331.5062 106cG (Yutaka Maeda) 20230331.5983 107V (Masayuki Moriyama) 20230401.542 111 (Takuichiro Onishi)

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[vsnet-rcb 873] RY Sgr fading again
by Taichi Kato 18 Nov '22

18 Nov '22

RY Sgr fading again YYYYMMDD(UT) mag observer 20221106.394 120 (Takuichiro Onishi) 20221107.392 <121 (Takuichiro Onishi) 20221107.4139 12.11V (Masayuki Moriyama) 20221109.392 <121 (Takuichiro Onishi) 20221109.4138 12.07V (Masayuki Moriyama) 20221110.408 12.02V (Hiroshi Itoh) 20221111.394 <121 (Takuichiro Onishi) 20221112.396 125: (Takuichiro Onishi) 20221116.4048 13.27V (Masayuki Moriyama)

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[vsnet-rcb 872] V482 Cyg fading again
by Taichi Kato 15 Nov '22

15 Nov '22

V482 Cyg fading again YYYYMMDD(UT) mag observer 20221024.4400 12.04V (Minoru Sato) 20221026.8639 118 (Eddy Muyllaert) 20221028.4285 13.64B (Seiichiro Kiyota) 20221028.4289 12.02V (Seiichiro Kiyota) 20221028.4294 11.09Rc (Seiichiro Kiyota) 20221028.4298 10.19Ic (Seiichiro Kiyota) 20221028.7396 120 (Eddy Muyllaert) 20221029.816 12.14V (Gary Poyner) 20221030.4889 12.20V (Minoru Sato) 20221030.792 120 (Gary Poyner) 20221030.7944 121 (Eddy Muyllaert) 20221031.3982 13.77B (Seiichiro Kiyota) 20221031.3987 12.11V (Seiichiro Kiyota) 20221031.3991 11.15Rc (Seiichiro Kiyota) 20221031.3995 10.24Ic (Seiichiro Kiyota) 20221103.510 125 (Hiroyuki Maehara) 20221103.8597 121 (Eddy Muyllaert) 20221103.962 120 (Gary Poyner) 20221104.821 119 (Gary Poyner) 20221107.915 12.31V (Gary Poyner) 20221108.8014 124 (Eddy Muyllaert) 20221109.5461 12.60V (Minoru Sato) 20221111.4632 12.28V (Minoru Sato) 20221112.819 127 (Gary Poyner)

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[vsnet-rcb 871] RY Sgr now brightening
by Taichi Kato 05 Nov '22

05 Nov '22

RY Sgr now brightening YYYYMMDD(UT) mag observer 20221014.4355 13.03V (Masayuki Moriyama) 20221014.465 130 (Hiroyuki Maehara) 20221015.3597 13.01V (Minoru Sato) 20221015.447 131 (Hiroyuki Maehara) 20221016.417 <128 (Takuichiro Onishi) 20221017.5285 128C (Masayuki Moriyama) 20221017.5301 130:V (Masayuki Moriyama) 20221019.3639 12.96V (Minoru Sato) 20221019.4001 12.43V (Seiichiro Kiyota) 20221019.4006 11.97Rc (Seiichiro Kiyota) 20221019.4010 11.54Ic (Seiichiro Kiyota) 20221019.4147 13.11V (Masayuki Moriyama) 20221019.442 131 (Takuichiro Onishi) 20221020.3559 12.94V (Minoru Sato) 20221020.3727 13.81B (Seiichiro Kiyota) 20221020.3732 12.59V (Seiichiro Kiyota) 20221020.3736 12.06Rc (Seiichiro Kiyota) 20221020.3740 11.58Ic (Seiichiro Kiyota) 20221021.3684 13.65B (Seiichiro Kiyota) 20221021.3688 12.55V (Seiichiro Kiyota) 20221021.3692 12.02Rc (Seiichiro Kiyota) 20221021.3697 11.59Ic (Seiichiro Kiyota) 20221021.431 128 (Takuichiro Onishi) 20221022.417 132 (Takuichiro Onishi) 20221023.4832 130:V (Masayuki Moriyama) 20221024.3487 12.60V (Minoru Sato) 20221025.3477 12.63V (Minoru Sato) 20221025.4712 12.37V (Masayuki Moriyama) 20221026.3564 13.50B (Seiichiro Kiyota) 20221026.3569 12.55V (Seiichiro Kiyota) 20221026.3573 12.02Rc (Seiichiro Kiyota) 20221026.3577 11.57Ic (Seiichiro Kiyota) 20221026.399 129 (Takuichiro Onishi) 20221027.4493 12.25V (Masayuki Moriyama) 20221028.3593 13.45B (Seiichiro Kiyota) 20221028.3597 12.56V (Seiichiro Kiyota) 20221028.3602 12.08Rc (Seiichiro Kiyota) 20221028.3606 11.63Ic (Seiichiro Kiyota) 20221029.3541 13.51B (Seiichiro Kiyota) 20221029.3545 12.48V (Seiichiro Kiyota) 20221029.3549 12.03Rc (Seiichiro Kiyota) 20221029.3554 11.50Ic (Seiichiro Kiyota) 20221029.397 125 (Takuichiro Onishi) 20221029.4153 12.16V (Masayuki Moriyama) 20221030.3596 12.64V (Seiichiro Kiyota) 20221030.3600 12.11Rc (Seiichiro Kiyota) 20221030.3605 11.60Ic (Seiichiro Kiyota) 20221031.3629 13.67B (Seiichiro Kiyota) 20221031.3633 12.65V (Seiichiro Kiyota) 20221031.3638 12.08Rc (Seiichiro Kiyota) 20221031.3642 11.67Ic (Seiichiro Kiyota) 20221102.392 122 (Takuichiro Onishi) 20221102.4028 12.05V (Masayuki Moriyama) 20221103.399 119 (Takuichiro Onishi)

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[vsnet-rcb 869] V381 Lac: brightest ever detected
by Taichi Kato 01 Nov '22

01 Nov '22

V381 Lac: brightest ever detected Several observers has noticed this brightening. YYYYMMDD(UT) mag observer 20210803.6329 <142cG (Yutaka Maeda) 20210806.6514 <149cG (Yutaka Maeda) 20210810.5941 <130cG (Yutaka Maeda) 20210820.5618 <161C (Masayuki Moriyama) 20210828.5687 <147cG (Yutaka Maeda) 20210908.7362 154C (Masayuki Moriyama) 20210908.7370 <156V (Masayuki Moriyama) 20210911.6637 153:C (Masayuki Moriyama) 20210914.5012 16.15V (Minoru Sato) 20210919.4885 <139cG (Yutaka Maeda) 20210919.692 138C (Mitsutaka Hiraga) 20210920.4901 15.97V (Minoru Sato) 20210922.4253 <133cG (Yutaka Maeda) 20210923.7509 142C (Masayuki Moriyama) 20210923.7520 155:V (Masayuki Moriyama) 20210928.6755 140C (Masayuki Moriyama) 20210928.6764 15.12V (Masayuki Moriyama) 20210928.6775 13.55Rc (Masayuki Moriyama) 20210928.6784 12.16Ic (Masayuki Moriyama) 20210928.6815 <15.37B (Masayuki Moriyama) 20211001.656 131C (Mitsutaka Hiraga) 20211001.7101 137C (Masayuki Moriyama) 20211001.7106 147V (Masayuki Moriyama) 20211004.5752 <147cG (Yutaka Maeda) 20211007.7087 13.42C (Masayuki Moriyama) 20211007.7087 150:V (Masayuki Moriyama) 20211010.4138 14.66V (Minoru Sato) 20211013.635 126C (Mitsutaka Hiraga) 20211013.7271 132C (Masayuki Moriyama) 20211017.7057 141V (Masayuki Moriyama) 20211019.6298 13.08C (Masayuki Moriyama) 20211019.6317 14.16V (Masayuki Moriyama) 20211023.7075 130C (Masayuki Moriyama) 20211025.628 125C (Mitsutaka Hiraga) 20211026.6401 129C (Masayuki Moriyama) 20211029.5316 140cG (Yutaka Maeda) 20211029.6413 131C (Masayuki Moriyama) 20211030.4275 14.17V (Minoru Sato) 20211101.4979 141:cG (Yutaka Maeda) 20211102.6370 128C (Masayuki Moriyama) 20211102.6379 14.33V (Masayuki Moriyama) 20211103.5404 139:cG (Yutaka Maeda) 20211106.4849 13.99V (Minoru Sato) 20211106.6904 127C (Masayuki Moriyama) 20211107.4731 <124cG (Yutaka Maeda) 20211110.550 142c (Tadashi Kojima) 20211115.6260 125C (Masayuki Moriyama) 20211116.5039 13.73V (Minoru Sato) 20211118.5044 136:cG (Yutaka Maeda) 20211119.6464 125C (Masayuki Moriyama) 20211119.6472 13.85V (Masayuki Moriyama) 20211126.6247 125C (Masayuki Moriyama) 20211126.6256 135V (Masayuki Moriyama) 20211204.4036 138cG (Yutaka Maeda) 20211208.3977 139cG (Yutaka Maeda) 20211213.5845 126C (Masayuki Moriyama) 20211221.5145 129C (Masayuki Moriyama) 20211223.3971 143:cG (Yutaka Maeda) 20211223.487 126C (Mitsutaka Hiraga) 20211231.3889 <146cG (Yutaka Maeda) 20220103.3965 <149cG (Yutaka Maeda) 20220104.5293 147:V (Masayuki Moriyama) 20220104.5301 133C (Masayuki Moriyama) 20220108.3997 <144cG (Yutaka Maeda) 20220127.4834 131C (Masayuki Moriyama) 20220211.4748 131C (Masayuki Moriyama) 20220401.8518 120C (Masayuki Moriyama) 20220418.8004 11.59C (Masayuki Moriyama) 20220418.8014 12.61V (Masayuki Moriyama) 20220419.7881 125V (Masayuki Moriyama) 20220504.7593 114C (Masayuki Moriyama) 20220504.7600 123V (Masayuki Moriyama) 20220507.7700 128cG (Yutaka Maeda) 20220517.6558 12.47V (Minoru Sato) 20220517.7700 126cG (Yutaka Maeda) 20220518.6976 113C (Masayuki Moriyama) 20220518.6995 12.35V (Masayuki Moriyama) 20220531.7200 127cG (Yutaka Maeda) 20220603.8091 12.29V (Masayuki Moriyama) 20220608.6478 12.48V (Minoru Sato) 20220630.633 131c (Tadashi Kojima) 20220701.7484 122V (Masayuki Moriyama) 20220708.6434 12.24V (Minoru Sato) 20220719.7289 119V (Masayuki Moriyama) 20220725.6165 11.88V (Minoru Sato) 20220729.5722 11.92V (Minoru Sato) 20220802.6500 120cG (Yutaka Maeda) 20220805.5827 11.82V (Minoru Sato) 20220807.6500 120cG (Yutaka Maeda) 20220808.7848 113C (Masayuki Moriyama) 20220808.7896 11.67V (Masayuki Moriyama) 20220809.594 118C (Mitsutaka Hiraga) 20220814.4518 11.79V (Minoru Sato) 20220821.6035 11.84V (Minoru Sato) 20220822.7046 116V (Masayuki Moriyama) 20220825.7812 11.64V (Masayuki Moriyama) 20220826.7320 116V (Masayuki Moriyama) 20220828.5231 11.78V (Minoru Sato) 20220904.4461 11.73V (Minoru Sato) 20220910.3961 11.73V (Minoru Sato) 20220914.4012 11.76V (Minoru Sato) 20220916.7247 117V (Masayuki Moriyama) 20220921.4560 11.91V (Minoru Sato) 20220924.482 119c (Tadashi Kojima) 20220926.4529 12.08V (Minoru Sato) 20220927.6681 11.94V (Masayuki Moriyama) 20220929.596 125c (Tadashi Kojima) 20221001.4915 12.16V (Minoru Sato)

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[vsnet-rcb 868] RY Sgr fading rapidly
by Taichi Kato 28 Sep '22

28 Sep '22

RY Sgr fading rapidly YYYYMMDD(UT) mag observer 20220814.512 71 (Masashi Nakatani) 20220818.510 71 (Noriaki Onodera) 20220818.510 75 (Masashi Nakatani) 20220819.508 72 (Noriaki Onodera) 20220821.528 73 (Noriaki Onodera) 20220827.6028 8.05V (Masayuki Moriyama) 20220828.500 77 (Noriaki Onodera) 20220830.137 8.01TG (Gary Poyner) 20220831.194 7.78TG (Gary Poyner) 20220831.8785 79 (Jose Ripero) 20220903.201 7.64TG (Gary Poyner) 20220903.8750 74 (Jose Ripero) 20220908.425 72 (Hiroyuki Maehara) 20220912.460 74 (Noriaki Onodera) 20220912.499 72 (Hiroyuki Maehara) 20220916.514 77 (Noriaki Onodera) 20220917.467 78 (Noriaki Onodera) 20220920.8646 84 (Jose Ripero) 20220921.460 80 (Noriaki Onodera) 20220926.451 94 (Noriaki Onodera) 20220926.8646 97 (Jose Ripero)

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[vsnet-rcb 867] V482 Cyg rising
by Taichi Kato 28 Sep '22

28 Sep '22

V482 Cyg rising So I must point again that Jose Ripero did not *know* that the object is already rising. The V-data suggest that the rise took place earlier than most visual observers noticed it. YYYYMMDD(UT) mag observer 20220829.058 13.98V (Gary Poyner) 20220829.9194 140 (Eddy Muyllaert) 20220829.962 139 (Gary Poyner) 20220830.971 138 (Gary Poyner) 20220831.5184 13.65V (Seiichiro Kiyota) 20220831.5189 12.65Rc (Seiichiro Kiyota) 20220831.5193 11.59Ic (Seiichiro Kiyota) 20220831.9097 <137 (Jose Ripero) 20220901.940 14.62 (Pavol A. Dubovsky) 20220901.9479 138 (Eddy Muyllaert) 20220903.8993 <137 (Jose Ripero) 20220903.985 14.83 (Pavol A. Dubovsky) 20220904.9243 140 (Eddy Muyllaert) 20220905.4110 12.87V (Minoru Sato) 20220905.9201 <137 (Jose Ripero) 20220907.023 136 (Gary Poyner) 20220907.700 133 (Hiroyuki Maehara) 20220908.983 131 (Gary Poyner) 20220910.016 12.92V (Gary Poyner) 20220910.017 12.52C (Gary Poyner) 20220910.017 12.97TG (Gary Poyner) 20220910.4133 12.78V (Minoru Sato) 20220910.8451 130 (Eddy Muyllaert) 20220910.949 129 (Gary Poyner) 20220914.3975 12.63V (Minoru Sato) 20220915.947 128 (Gary Poyner) 20220916.912 128 (Gary Poyner) 20220917.946 127 (Gary Poyner) 20220918.949 12.85 (Pavol A. Dubovsky) 20220919.8188 128 (Eddy Muyllaert) 20220920.9014 <137 (Jose Ripero) 20220921.923 126 (Gary Poyner) 20220922.065 12.51V (Gary Poyner) 20220923.919 124 (Gary Poyner) 20220924.4302 12.34V (Minoru Sato) 20220924.980 122 (Gary Poyner) 20220926.9014 <137 (Jose Ripero)

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[vsnet-rcb 866] Re: [VSS] V0854 CEN fading? and S Aps possible fade
by Peter Williams 04 Aug '22

04 Aug '22

Hello! The RCB star V854 Cen has continued to fade as per the recent visual observations. S Aps, however, remains bright but a little below its nominal maximum brightness. APSS 20220801.377 99 WPX APSS 20220803.470 102 WPX CENV854 20220801.370 87 WPX CENV854 20220803.463 96 WPX Tks and regards Peter Williams Heathcote NSW 20x80mm binoculars From: Peter Williams [mailto:pfwilliams@onaustralia.com.au] Sent: Saturday, 30 July 2022 8:58 PM To: 'VariableStarsSouth(a)googlegroups.com' <VariableStarsSouth(a)googlegroups.com> Cc: vsnet rcb (vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp) <vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp>; vsnet alert (vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp) <vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp> Subject: RE: [VSS] V0854 CEN fading? and S Aps possible fade 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 <mailto:VariableStarsSouth@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-rcb 865] V0854 CEN FADING
by Cledison Marcos da Silva 31 Jul '22

31 Jul '22

Hello friends from VSNET.I've been following V0854 Centauri since the beginning of the year, more frequently since April. On the night of 07/28 I noticed that it was dimmer than the 7.5 magnitude comparison star. As the days passed it continued to decline. Being today close to magnitude 8.5, approximately 2.5 times dimmer than the day I noticed the drop. After my warning, other observers confirmed the fall, Antonio Padilla Filho, Moisés Montero Reyes Ortíz, Eurimar Araujo, Paulo Reis Fernandes, Daniel Jose Mendicini and Peter F Williams. There is a small possibility that the star will regain its brightness and go back to "max", but what we are seeing appears to be a deep minimum of it. The last one was in 2020 (left corner of the light curve), it was not a deep minimum, as it can get close to magnitude 15. [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-anima…]<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Livre de vírus. www.avast.com<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…>.

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[vsnet-rcb 864] 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-rcb 863] Re: V482 Cyg fading (since May 1)
by Taichi Kato 25 May '22

25 May '22

Re: V482 Cyg fading (since May 1) Early phase of R CrB-type fading is notoriously difficult to notice visually. Here is the comparison. YYYYMMDD(UT) mag observer 20220415.5439 11.517g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5452 11.511g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5464 11.525g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6268 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6281 11.543g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6293 11.539g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.3998 11.553g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4010 11.521g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4023 11.476g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220419.7100 108cG (Yutaka Maeda) 20220423.6060 11.584g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6072 11.587g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6085 11.597g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4842 11.537g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4855 11.550g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5062 11.563g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5074 11.562g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5087 11.575g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5408 11.576g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5421 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5433 11.556g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4971 11.561g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4983 11.603g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4996 11.621g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5310 11.615g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5323 11.623g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5336 11.616g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4859 11.683g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4871 11.639g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4884 11.654g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5653 11.690g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5666 11.659g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5678 11.674g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4526 11.855g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4539 11.876g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4552 11.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.9701 108 (Jose Ripero) 20220507.9868 108 (Jose Ripero) 20220508.3992 12.067g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4005 11.996g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4018 12.116g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.9590 110 (Eddy Muyllaert) 20220509.078 109 (Gary Poyner) 20220511.4713 12.305g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4726 12.321g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4739 12.270g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5409 12.328g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5421 12.342g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5434 12.356g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3077 12.430g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3089 12.368g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3103 12.440g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3552 12.462g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3565 12.428g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3578 12.452g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2920 12.648g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2934 12.586g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4594 12.619g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4608 12.734g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.062 115 (Gary Poyner) 20220521.4143 12.780g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4155 12.781g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4168 12.777g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4567 12.789g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4580 12.806g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4592 12.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.9819 119 (Eddy Muyllaert) 20220524.149 11.84C (Gary Poyner) 20220524.149 12.02TG (Gary Poyner) 20220524.606 120 (Hiroyuki Maehara)

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[vsnet-rcb 862] Re: [baavss-alert] V482 Cyg fading (since May 1)
by Gary Poyner 24 May '22

24 May '22

Cloudy here last night, but clear at SLOOH Tenerife... V482 Cyg May 24.149UT 11.84CV V482 Cyg May 24.149UT 12.02TG Observers should be careful of a close 13.7 mag star 7" to the SW if V482 Cyg continues to fade. Gary On Tue, 24 May 2022 at 10:48, Patrick Schmeer via groups.io <pasc1312-aavso= yahoo.de(a)groups.io> wrote: > V482 Cygni (RCB) > https://www.aavso.org/vsx/index.php?view=detail.top&oid=11402 > > The current fading began in early May 2022 according to > ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S > and Kochanek et al. 2017PASP..129j4502K) data (complete): > > https://asas-sn.osu.edu/sky-patrol/coordinate/2c766f33-797f-437f-9109-bff0e… > > AAVSO data: > https://app.aavso.org/webobs/results/?star=V482+Cyg > > Photometric (e.g. V band) and spectroscopic observations > are encouraged. The Vmag range in VSX is 10.65 - <14.5. > > Clear skies, > Patrick > ------------------------------------------------------ Gary Poyner FRAS garypoyner(a)gmail.com www.variablestars.co.uk

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