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cataclysmic variable

Alert Notice #480: MR UMa superoutburst coverage requested for HST observations

March 8, 2013:  Dr. Boris Gaensicke (Warwick University) has requested observations of the currently-outbursting SU UMa-type cataclysmic variable MR UMa in preparation for and support of HST observations scheduled for the week 2013 April 4-7.

Special Notice #330: Next HST/COS targets are IR Com and BB Dor

February 2, 2013:  Further to AAVSO Alert Notice 471 (, the next HST/COS target is the SU UMa-type dwarf nova IR Com. HST/COS observations are scheduled for:

     IR Com   2013 February 8 00:38:46 through 05:57:49 UT

IR Com is an eclipsing SU UMa-type dwarf nova. According to observations in the AAVSO International Database, it reaches V magnitude 18-19 at minimum. IR Com can be as bright as 13.5 V at maximum.

Special Notice #321: Observations critical tonight for SDSS J093249.57+472523.0

January 10, 2013: Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #319 (, tonight's observations of SDSS J093249.57+472523.0 will be critical, as sometime tomorrow (January 11) the scheduling team will make the final decison about going ahead with the HST COS observations planned for

Special Notice #319: HST COS observing SDSS J093249.57+472523.0 2013 January 11-12

January 4, 2013: Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #317 (, HST COS is scheduled to observe the U Gem-type cataclysmic variable

                    SDSS J093249.57+472523.0   on  2013 January 11 21:18:00 through January 12 02:57:19 UT

Special Notice #311: HST COS to observe CW Mon 2012 November 30 - December 1

November 20, 2012:  The HST COS far ultraviolet observations of the dwarf nova CW Mon will be taking place 2012 November 30 20:54:49 through 2012 December 1 02:26:15 UT (AAVSO Special Notice #309,


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