THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
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                 AAVSO ALERT NOTICE 191 (August 18, 1994)


RARE OUTBURST OF 1439+22A UZ BOOTIS

We have been informed by AAVSO member observer David York, Abiquiu, NM, and 
by Paul Van Cauteren, Aartselaar, Belgium, Tonny Vanmunster, Landen, Belgium, 
and Gary Poyner, Birmingham, England, of the outburst of the WZ Sge-type dwarf 
nova UZ Boo.  York observed UZ Boo on August 17.167 UT at visual magnitude 
13.9.

The last observed outburst of UZ Boo occurred on September 23, 1978, when it 
reached visual magnitude 11.5 and remained bright for approximately 28 days.

Recent observations include:  Aug 7.906 UT, <14.4, (G. Poyner, Birmingham, 
England), 12.159, <14.8 (M. Adams, McDonald Observatory, TX); 15.891, <13.3 
(T. Vanmunster, Landen, Belgium); 16.458, <15.1 (M. Iida, Nagano, Japan); 
16.87, <12.5 (P. Schmeer, Bischmisheim, Germany); 17.167, 13.9 (D. York, 
Abiquiu, NM); 17.224, 13.9 (York); 17.849, 12.0 (J. Pietz, Erftstadts, 
Germany); 17.903, 11.8 (Vanmunster); 18.108, 11.7 (Adams); 18.188, 11.6 (R. 
Royer, Lakewood, CA).

Accompanying is an AAVSO "e" scale chart of UZ Boo prepared by C. Scovil.  
Please use it to observe this star and report your observations to AAVSO 
Headquarters so that we may inform the astronomical community.  Please 
indicate which comparison stars you used in making your observations when 
reporting them.  The answering machine at Headquarters, with our charge free 
number (1-800-642-3883), is on nights and weekends for your convenience.  


Janet Mattei, who is in The Hague, Netherlands, attending the International 
Astronomical Union General Assembly, and I thank you very much for your 
astronomical efforts and contributions.

Good observing!

Elizabeth O. Waagen
Senior Technical Assistant