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Special Notice #317: HST COS observing HS 0218+3229 2012 December 22 and SDSS J093249.57+472523.0 is probable next target

Due to the New England winter storm currently affecting the area, phone coverage at the AAVSO may be much reduced until Thursday. The staff is still available via email, and we suggest using that method to contact us if you need assistance.

December 20, 2012: Further to AAVSO Alert Notice 471 (www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #315 (www.aavso.org/aavso-special-notice-309), HST COS is scheduled to observe the U Gem-type cataclysmic variable HS 0218+3229 on December 22:

                              HS 0218+3229  22 December 2012 06:07:48 through 10:17:53 UT

***PLEASE GIVE HS 0218+3229 TOP PRIORITY - YOUR OBSERVATIONS WILL BE CRUCIAL FOR THE HST SCHEDULING TEAM TO DECIDE TOMORROW whether to carry out the observations.***
HS 0218+3229 is 15.5V at minimum and 12.5V at maximum.

Coordinates for HS 0218+3229: R.A. 02 21 33.48  Dec +32 43 23.9 (2000.0)


The probable next HST COS target is the UG-type dwarf nova SDSS J093249.57+472523.0:

                                     SDSS J093249.57+472523.0  window: 2013 January 7 - 14

Please focus on SDSS J093249.57+472523.0 after the HS 0218+3229 HST observations are over. A more precise schedule of observations will be announced as soon as it is available. 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. HS 0218+3229 is a reasonable visual target at 12.5-15.5V. SDSS J093249.57+472523.0 is most likely too faint for positive visual observations at minimum. If positive visual observations of either system are possible they are welcome, as are visual fainter-than observations fainter than magnitude 15.0.

Charts for both targets may be created using VSP (www.aavso.org/vsp). When requesting a chart for HS 0218+3229, be sure to include the space after HS.

Please report observations as soon as possible to the AAVSO International Database as HS 0218+3229 and SDSS J093249.57+472523.0, respectively. 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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