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Special Notice #268: Chandra observations scheduled for CH Cyg and monitoring urgently needed

23 March 2012: The Chandra X-ray satellite observations of the symbiotic variable CH Cyg have been scheduled as part of Dr. Margarita Karovska's (Harvard-Smithsonian Center for Astrophysics) campaign. Please see AAVSO Alert Notice 454 and AAVSO Special Notice #267 for complete details on this observing campaign. The HST observations of CH Cyg have already been made.
Chandra will be observing CH Cyg 2012 March 24 21:31:23.489 UT to 2012 March 25 13:04:43.489 UT.

Visual and photometric observations are urgently requested. High-speed photometry in as many bands as possible would be particularly valuable before, during, and after the Chandra observations. Halpha, OIII region, and optical spectroscopy are also requested. CH Cyg is currently at magnitude V = 7.2.

Coordinates: RA 19 24 33.07  Dec. +50 14 29.1 (J2000.0)

Finder charts may be plotted using the AAVSO International Variable Star Plotter (VSP) at

Please report observations to the AAVSO International Database as CH CYG.

Dr. Karovska is grateful for the excellent data provided to date. Please keep up the good work and continue your coverage of this very interesting system. Many thanks!

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


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