vsnet-rcb May 2023

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

3 participants
2 discussions

[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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