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			THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 
				25 Birch Street, Cambridge, MA 02138 USA
				BITNET: aavso@cfaS SPAN: nssdca::cfa8::aavso
					INTERNET: aavso@cfaO.harvard.edu
				Tel. 617-354-0484	FAX 617-354-0665


			AAVSO ALERT NOTICE 165 (October 26, 1992)


RARE OUTBURST OF 0846+ 58 BZ URSAE MAJORIS

We have been informed by David York, Abiquiu, NM, that the dwarf nova BZ UMa 
is having a bright outburst - probably a superoutburst - as shown by his 
observation on October 26.25 UT at magnitude 10.5. The last confirmed 
outburst of BZ UMa in the AA VSO data files was in April 1991, 
and was observed by Gerry Dyck, Patrick Schmeer, and Haakon Dahle.

If this outburst is indeed a superoutburst, i.e., it lasts about 10 days, 
it will be extremely valuable to see if superhumps (small-amplitude periodic 
oscillations) can be observed visually. In order to look for superhumps, 
observations should be made every 10 minutes. Very accurate recording of 
the times of observation is essential.

Accompanying are AAVSO preliminary "d" and "e" scale charts for BZ UMa. 
Please observe this star and report your observations to AAVSO. The answering 
machine (617354-0484) is on nights and weekends for your convenience.

We extend the appreciation and thanks of the EUVE Science Team for the very 
enthusiastic response from observers worldwide in monitoring EUVE targets 
during the satellite's survey mode. Please continue your observations and 
call them in to the AAVSO.

Many thanks for your efforts. Good observing!

Janet A. Mattei
Director

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