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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

Your observations will enable the HST scheduling team to decide around January 10 whether to carry out the observations. The target must not be in outburst for HST to be able to observe it. SDSS J093249.57+472523.0 is 17.9V at minimum and unknown at maximum.

Coordinates for SDSS J093249.57+472523.0:  R.A. 09 32 49.58   Dec. +47 25 23.2   (2000.0)

As instructed in AAVSO Alert Notice 471, for CCD observers, simultaneous photometry [shortly before, during, and after the HST observations] would be ideal. B filter would be best for a light curve, although for the magnitude estimates, a V measurement would be best. An uninterrupted light curve would be better than cycling between filters. SDSS J093249.57+472523.0 is most likely too faint for positive visual observations at minimum. If positive visual observations are possible, however, they are welcome, as are visual fainter-than observations fainter than magnitude 15.0.

Charts may be created using VSP (

Please report observations as soon as possible to the AAVSO International Database as SDSS J093249.57+472523.0. If an outburst is detected, please report observations immediately. Many thanks!

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


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