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dwarf nova

Special Notice #322: CU Vel is next HST COS target

January 14, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #309 (http://www.aavso.org/aavso-special-notice-309), the next HST COS target is the classic SU UMa-type dwarf nova CU Vel. HST COS is scheduled to observe it:

                                                  2013 January 18 06:52:10 through 10:21:40 UT

Alert Notice 475: Monitoring of the dwarf nova U Geminorum in support of HST observations

December 22, 2012: As announced by Dr. Matthew Templeton (AAVSO) in AAVSO Special Notice #316 (www.aavso.org/aavso-special-notice-316), Dr. Michael Shara (American Museum of Natural History, Columbia University) has requested dense coverage of the dwarf nova U Gem in support of HST Cosmic Origins Spectrograph (COS) observations scheduled for now through February 20, 2013.

Special Notice #314: HST COS scheduled to observe V405 Peg December 7

December 5, 2012: As announced in AAVSO Special Notice #313 (www.aavso.org/aavso-special-notice-313), HST COS is scheduled to observe the UG-type dwarf nova V405 Peg

                        7 December 2012 02:31:20 through 07:50:03 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, www.aavso.org/aaso-special-notice-309).

Special Notice #307: Observations crucial tonight for SDSS J001153.08-064739.1

November 8, 2012: The HST COS far ultraviolet observations of the dwarf nova SDSS J001153.08-064739.1 have been scheduled for 2012 November 9 20:42:29 UT through November 10 04:57:33 UT (AAVSO Special Notice #304).

Your observations from tonight are crucial to confirm whether the target is at minimum (which it must be for HST to observe it).

Coordinates:  R.A. 00 11 53.08     Dec. -06 47 39.2     (2000.0)

Special Notice #304: HST COS observations of SDSS J001153.08-064739.1 scheduled

October 31, 2012:  Further to AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden) and AAVSO Special Notice #298, the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of THE NEXT TARGET from the list, the dwarf nova-type cataclysmic variable

                           SDSS J001153.08-064739.1,

have been scheduled for 2012 November 9 20:42:29 UT through 2012 November 10 04:57:33 UT.

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