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AAVSO Special Notice #26

Possible Minor Outburst of 0324+43 GK Persei
(December 15, 2006)

Coordinates: 03:31:11.82 +43:54:16.8  (2000.0)

Recent observations of the old nova intermediate polar magnetic catclysmic
variable GK Per (Nova Per 1901) show the star brighter than minimum. However,
it is too early to tell if an outburst is underway.

It is only slightly over two years since its last minor outburst - the usual
interval is three years or more. However, the last rise to maximum was highly
anomalous, taking over two months instead of the usual one month to reach
maximum. Thus, it is possible that the next outburst might not occur at the
usual interval.

The pattern of dwarf nova outbursts in GK Per has been quite stable since
the 1981 outburst, so the change in behavior in the September 2004 outburst
may be significant.

Recent observations submitted to the AAVSO include:

Dec. 11.0035 UT, 13.1, J. Bortle, USA;
11.9903, 13.1, S. Swiercznski, Poland;
12.0764, 13.1, E. Muyllaert, Belgium;
12.7778, 12.8, K. Wenzel, Germany;
12.8326, 13.0, J. Speil, Poland;
12.8680, 12.8, P. Schmeer, Germany;
13.0708, 12.7, A. Dill, USA;
13.2181, 12.2, R. Stine, USA;
13.7639, 12.9, J. Ripero, Spain;
13.8860, 12.6, Schmeer;
14.0340, 12.5, Dill;
14.0486, 12.4, C. Chiselbrook, USA;
14.3236, 12.5, M. Linnolt, USA;
14.7190, 12.4, Schmeer;
14.7257, 12.5, Wenzel;
14.7431, 12.9, Speil;
14.7708, 12.6, W. Kriebel, Germany;
14.9757, 12.3, Bortle;
14.9917, 12.6, Swierczynski;
15.2674, <11.9, K. Hutton, USA;
15.2972, 12.4, Linnolt;
15.8542, 12.4,  Wenzel.

Charts: AAVSO 'd' and 'e' charts and Henden/Sumner sequence/photometry
information may be found at:
http://www.aavso.org/cgi-bin/searchcharts3.pl?name=gk%20per

Please keep a close eye on GK Per and report your observations to the AAVSO.

Many thanks for your astronomical contributions.

Good observing,

Elizabeth Waagen

Keywords:
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484