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dwarf nova

Special Notice #343: GK Per outburst appears to be underway

March 18, 2013:  The old nova GK Per (N Per 1901), which has dwarf nova outbursts, appears to be going into outburst, according to observations submitted to the AAVSO International Database:

Special Notice #342: PU CMa, then IY UMa and MR UMa next HST/COS targets

March 18, 2013:  Further to AAVSO Alert Notice 471 (, HST/COS is scheduled to observe the SU UMa-type dwarf nova PU CMa:

PU CMa   2013 March 22 00:00:43 through 02:36:08 UT

The HST observations of PU UMa may be cancelled/postponed, as PU CMa is currently in outburst, according to observations reported to the AAVSO:

Special Notice #329: Critical time for CV Campaign HST/COS target SDSS J100515.38+191107.9

January 29, 2013:  SDSS J100515.38+191107.9 is the upcoming target for the HST/COS CV Campaign (see AAVSO Alert Notice 471 and AAVSO Observing Campaigns page ( for details and related Special Notices). Dr. Gaensicke writes:

"We are now entering the critical phase before the HST observations of SDSS1005+1911, scheduled for

                              Jan 31, 2013 01:17:09 to Jan 31, 2013 06:24:00 UT

Special Notice #326: Next HST/COS target is SDSS J100515.38+191107.9

January 24, 2013: Further to AAVSO Alert Notice 471 (, the next HST COS target is the SU UMa-type dwarf nova SDSS J100515.38+191107.9. HST COS is scheduled to observe it:

                                          SDSS J100515.38+191107.9 2013 January 31 01:17:09 through 06:24:00 UT


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