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Alert Notice 186: Bright outburst of UV Per AND Nova Sgr 1994 Number 2 [V4362 Sgr] AND Nova Cas 1993 [V705 Cas] AND Superoutburst of VW Hyi AND Reminder on SS Cyg

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AAVSO ALERT NOTICE 186 (June 1, 1994)


The dwarf nova-type cataclysmic variable UV Per is having a bright outburst (possibly
superoutburst), as indicated by the observations below:

May 17.96 UT, < 13.6 T. Vanmunster, Landen, Belgium); 22.08, < 13.0 P. Schmeer,
Bischmisheim, Germany); 29.91, 11.9 (Vanmunster); 29.96, 11.8 (Vanmunster) ;; 29.99, 11.9
(Vanmunster); 30.92, 12.1 (Vanmunster); 31.00, 11.5 (G. Poyner, Birmingham, England);
31.02, 11.9 (Vanmunster); 31.05, 11.8 (Schmeer); 31.99, 11.7 (Poyner); Jun 1.04, 11.6
(Schmeer);1.48, 10.5 (R. Royer, Lakewood, CA).

The two most recent outbursts of UV Per were in April 1993, when it reached 12th
magnitude at maximum and was brighter than 13th magnitude for 3 days, and in December
1991, a bright and long outburst when it reached llth magnitude and stayed brighter than
13th magnitude for 10 days.

If this is indeed a superoutburst (a long and a bright outburst), and if at all possible, both
visual observers and those with CCDs are strongly recommended to look for its
superhumps (oscillations of several tenths of a magnitude and a period of 1 hour and 35.9
minutes). Observations made every 5 to 10 minutes and the exact time (to 4 decimals of the
JD) are needed.

Accompanying is an AAVSO 'f' scale chart of UV Per. Notice that the sequence for this
star was revised considerably in 1981, and that the latest issue of this chart is 1986. Please
make sure that you have replaced any pre-1981 UV Per chart in your files with this one.
When you report your observations to AAVSO Headquarters, please indicate which chart
(including date of issue) and which comparison stars you are using.

Chart links are obsolete; 01/2014 create charts using VSP at

1824-17 NOVA SAGITTARII 1994 NUMBER 2 [V4362 SGR]

This nova is brightening, as indicated by the following observations:

May 24.30 UT, 11.8 (C. Scovil, Stamford, CT); 26.44, 11.1 (R. Royer, Lakewood, CA);
27.91, 10.8 (D. Overbeek, Edenvale, South Africa); 28.36, 11.0 (Royer); 29.31, 10.8
(Royer); 30.01, 10.7 (Overbeek); 30.23, 11.1 (R. Stewart, Rochelle Park, NJ); 30.27, 10.2
(Royer); 30.30, 10.7 (Scovil); 31.01, 10.4 (T. Vanmunster, Landen, Belgium); 31.22, 10.8 (J.
McKenna, Upper Montclair, NJ); June 1.09, 10.3 (P. Schmeer, Bischmisheim, Germany);
1.44,10.4 (E. Halbach, Estes Park, CO); 1.48, 10.2 (Royer).

Please monitor this nova closely, using the chart distributed with AAVSO Alert Notice 185,
and report your observations to Headquarters.

2337+56 NOVA CASSIOPEIAE 1993 [V705 CAS]

This interesting nova reached minimum in March at about 15th magnitude, started to
recover in mid-April, and continues to brighten, as indicated by the observations below:

May 15.04 UT, 12.8 (K. Sarneczky, Raktanya, Hungary); 15.94, 13.3 (T. Vanmunster,
Landen, Belgium); 15.97, 13.3 (A. Diepvens, Balen, Belgium); 18.00, 13.3 (Vanmunster);
13.0 (R. Royer, Lakewood, CA); 20.06, 13.4 (Vanmunster); 20.07, 13.4 (Vanmunster);
28.26, 13.1 (R. Stewart, Rochelle Park, NJ); 28.40, 12.8 (Royer); 29.94, 12.3 (Vanmunster);
30.94, 12.1 (Vanmunster); 31.07, 12.2 (G. Poyner, Birmingham, England); 31.07, 12.3 (P.
Schmeer, Bischmisheim, Germany); 31.34, 12.5 (P. Robbins, Kansas City, KS); Jun 1.04,
12.2 (Poyner); 1.06, 12.2 (Schmeer); 1.50, 12.7 (Royer).

It is predicted that N Cas 93 will reach a second maximum which will be much fainter than
the first maximum, and then will slowly decline, as was the case with DQ Her. Please
continue to observe this nova closely, and report your observations to AAVSO


VW Hyi is having a superoutburst, as indicated by the following observations:

May 29.71, 12.3 (D. Overbeek, Edenvale, South Africa); 30.07, 11.4 (Overbeek); 30.68, 8.4
(L. Monard, Pretoria, South Africa); 30.69, 8.9 (Overbeek); 31.10, 8.9 (Overbeek); 31.16,
8.6 J. Smit, Waverly, South Africa); 31.70, 8.4 (J. Hers, Sedgefield, South Africa); Jun 1.70,
8.2 (Hers).

Astronomers planning to observe this star with EUVE satellite have been alerted to this
outburst for possible scheduling of the satellite to make pointed observations. Please
monitor this star closely and report your observations to AAVSO Headquarters throughout
its outburst so that we may inform the astronomers.


Please keep a close eye on SS Cyg and alert us when it starts to brighten, i.e., brighter than
11.5, as several astronomers are interested in monitoring its outburst with the IUE and
EUVE satellites (see AAVSO Alert Notice 184).

The answering machine at AAVSO Headquarters is on nights and weekends for your

Thank you very much for all your efforts and your vital astronomical contributions.

Clear skies and good observing!

Janet A. Mattei


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