THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
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AAVSO ALERT NOTICE 159 (July 7, 1992)
MINOR OUTBURST OF 0324+43 GK PERSEI (NOVA PER 1901)
This old nova of 1901 is having another minor outburst, as indicated by the following observations: July 3.31 UT, 12.3 (J. Bortle, Stormville, NY); 3.33, 12.7 (G. Dyck, Assonet, MA); 4.38, 12.3 (M. Adams, Melbourne, FL); 5.38, 12.1 (Adams); 6.38, 11.8 (Adams); 7.30, 11.8 (Bortle); 7.33 (Dyck);. John Bortle, who caught GK Per going up, shares his experience with us, saying that he was observing comets early on the morning of July 3 and decided to look at GK Per, and he discovered it in outburst. This discovery is his fourth of the minor outbursts of GK Per. Gerry Dyck's discovery of this outburst was independent.
Since 1966, GK Per has had 10 minor outbursts. The information on the previous minor outbursts, giving dates and magnitudes of maxima, is listed below in Table 1. An AAVSO optical light curve of the two most recent outbursts is also below. For information on the previous outbursts, see AAVSO Alert Notices 87 and 113.
A group of theoretical astronomers from the University of Texas are particularly interested in GK Per, and have requested observers to keep a very close eye on this outburst. Please monitor GK Per in the early morning sky as closely as possible and call in your observations to Headquarters. The answering machine (617-354-0484) in on nights and weekends for your convenience.
Table 1. Previous Minor Outbursts of GK Per
Year JD(max) Mag(max)
1966 2439362 10.9
1967 2439760 11.9
1970 2440878 10.9
1973 2441701 12.0
1975 2442456 10.5
1978 2443695 12.5
1981 2444679 10.4
1983 2445561 10.3
1986 2446777 10.3
1989 2447760 10.3
image: LIGHTCURVE OF GK PER 2446600-2448000
1221+09 SUPERNOVA IN NGC 4411B
Below are recent observations of the supernova in NGC 4411B (see AAVSO Alert Notice 158): July 3.09 UT, 13.6 (M. Adams, Melbourne, FL); 3.11, 13.5 (B. WIlson, Houston, TX); 3.11, 13.5 (P. Sventek, Houston, TX); 6.19, 13.5: photovisual (R. Royer, Wrightwood, CA).
Many thanks for your efforts and valuable observations. Good observing!
Janet A. Mattei
Director
files: light curve of GK Per
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