September 11, 2012: As announced in AAVSO Alert Notice 454  (http://www.aavso.org/aavso-alert-notice-454 ) and updated in AAVSO Special Notices #267  and #268  (http://www.aavso.org/aavso-special-notice-267  and -268), Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) is carrying out a multiwavelength campaign on the symbiotic variable CH Cyg this year. The satellite observations have taken place, and Dr. Karovska wants to continue the observing campaign through the 2012 observing season. She wants to study CH Cyg as the jet appears and to see the associated color behavior, and so is requesting continued V, R, and particularly B observations of the system for as long as CH Cyg is observable this season. Time series observations are not necessary; one or two observations per night will be sufficient. Visual observations are welcome and are encouraged.
Please continue your observations of CH Cyg throughout the 2012 observing season and report all observations to the AAVSO International Database as CH CYG.
Coordinates: RA 19 24 33.07 Dec. +50 14 29.1 (J2000.0)
Charts for CH Cyg may be plotted using the Variable Star Plotter (VSX) at http://www.aavso.org/vsx .
Thank you for your astronomical efforts and valuable contributions!
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
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