Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Sun, 08/19/2018 - 21:41
CY Coronae Borealis (UG)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=132729
Bright outburst confirmed (brightest mag. ever recorded):
CRBCY 20180819.869 122 Scp
Time-resolved and multiband photometry are strongly recommended.
Regards,
Patrick
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Gary Poyner wrote (vsnet-alert 22425):
Bright outburst of the UG star CY CrB...
Aug 10.998 18.52CV
Aug 16.915 <18.70CV
Aug 18.922 12.18CV Outburst
OU COAST telescope.
Observers should be aware of some issues with the present AAVSO sequence for CY CrB:
https://www.aavso.org/apps/vsp/photometry/?fov=60&star=CY+CRB&maglimit=17.5
The 12.136V comp star is saturated in Arne's photometry of this field. The 12.624V comp may be a little saturated as well. I noticed this when I was attempting to measure some recent images of mine and was comparing this sequence with a larger set of APASS mags for this field. The rest of the current sequence looks good except for the 14.260V comp star. This star is a close double and should be avoided.
The APASS V mag for the 12.136V comp star is 11.75V. This is means that CY CrB's V mag probably peaked in the upper 11's rather than the low 12's.
Bob