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Alert Notice 192: Outburst of IP Peg AND Request for observations of HT Cas, UX UMa, and IP Peg AND Outburst of UZ Boo continues AND Outburst of SS Cyg

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
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Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 192 (August 29, 1994)

OUTBURST OF 2318+17 IP PEGASI

We have been informed by T. Kato, Kyoto University, Japan, that the dwarf nova IP Peg
has gone into outburst. The last observed outburst of IP Peg occurred on January 11, 1994,
when it reached magnitude 11.8 and was bright for 12 days. Recent observations include:

Aug 23.919 UT, <13.8, G. Poyner, Birmingham, England; 26.883, 12.7, J. Pietz, Erftstadts,
Germany; 26.980, 13.1, T. Vanmunster, Landen, Belgium; 26.986, 13.1, Vanmunster;
26.989, 13.2, E. Broens, Mol, Belgium; 26.991, 13.1, Vanmunster; 27.1465, 12.0, D. York,
Abiquiu, NM; 27.1701, 12.0, York; 27.1910, 12.0, York; 27.3194, 12.1, R. Royer, Lakewood,
CA; 27.8944, 12.5, Poyner; 27.8951, 13.2, Poyner; 27.8958, 13.7, Poyner; 27.8965, 13.5,
Poyner; 27.8972, 13.5, Poyner; 27.8979, 13.5, Poyner; 27.8986, 13.7, Poyner; 27.8993, 13.7,
Poyner; 27.9000, 13.7, Poyner; 27.9014, 13.4, Poyner; 28.1549, 12.1, R. Stewart, Rochelle
Park, NJ; 28.2146, 13.6, Stewart; 28.2535, 12.0, Royer; 28.2554, 11.8, J. McKenna, Upper
Montclair, NJ.

Please monitor IP Peg closely, using the accompanying AAVSO chart, and report your
observations to AAVSO Headquarters. IP Peg is a cataclysmic variable that has deep
eclipses of two magnitudes or more with a period of 3.8 hours and a duration of several
tens of minutes. Monitoring the eclipses during the outburst is valuable and
recommended; report the timing of all positive observations to the minute (four decimal
places).

Chart links are obsolete; 01/2014 create charts using VSP at http://www.aavso.org/vsp

REQUEST FOR OBSERVATIONS OF 0103+59 HT CAS, 1332+52 UX UMA, AND
2318+17 IP PEG

An astronomer from Muenster University, Germany, has requested our assistance in
observing northern eclipsing dwarf novae in outburst. From now until the end of
September, please monitor the eclipsing dwarf novae HT Cas, UX UMa, and IP Peg, and
contact AAVSO Headquarters if you observe any of them go into outburst. As IP Peg is in
outburst at this time, it is very unlikely it will have another outburst next month, but please
monitor it all the same. If any of these stars does have an outburst, please follow it until it
returns to minimum.

Accompanying are AAVSO charts for these three stars. Please use them to observe, and
report your observations to the AAVSO, indicating the comparison stars you used, and
reporting your observations to the minute (four decimal places of the Julian Date).

OUTBURST OF 1439+22A UZ BOOTIS CONTINUES

The dwarf nova UZ Boo, continuing in outburst (see AAVSO Alert Notice 191), is fading
slowly, as indicated by the following observations:

Aug 18.82 UT, 12.1, L. Szentasko, Veresegyhaz, Hungary; 18.84, 11.9, J. Pietz, Erftstadts,
Germany; 18.85, 11.9, Pietz; 18.86, 11.6, E. Broens, Mol, Belgium; 18.86, 11.7, A. Diepvens,
Balen, Belgium; 18.86, 11.8, Pietz; 18.87, 11.9, Pietz; 18.88,11.6, Pietz; 18.89,11.6, Pietz;
18.90, 11.6, Pietz; 18.94, 11.8, Pietz; 19.10, 11.7, M. Adams, Fort Davis, TX; 19.16, 12.1, R.
Royer, Lakewood, CA; 19.87, 11.9, P. Schmeer, Bischmisheim, Germany; 19.88, 11.9, J.
Ripero, Madrid, Spain; 19.88,11.9, G. Comello, Groningen, the Netherlands; 19.89, 12.1, T.
Vanmunster, Landen, Belgium; 20.07, 11.7, C. Scovil, Stamford, CT; 20.19, 12.4, Royer;
20.85, 12.4, Schmeer; 20.86, 12.2, Schmeer; 20.86, 11.8, Ripero; 21.04, 11.8, R. Stewart,
Rochelle Park, NJ; 21.21, 12.4, Royer; 21.22, 12.4, Royer; 21.86, 11.8, Ripero; 22.16, 12.5,
R. Manske, Waunakee, WI; 22.16, 12.7, D. Weier, Madison, WI; 22.85, 12.0, Broens; 22.91,
12.2, B. Granslo, Fjellhamar, Norway; 23.14, 12.7, W. Dillon, Missouri City, TX; 23.17, 12.8,
Royer; 23.18, 12.6, G. Emerson, Golden, CO; 23.40, 12.5, T. Cragg, Coonabarabran,
Australia; 23.40, 12.4, J. Griese, Coonabarabran, Australia; 23.49, 12.9, S. Sakuma,
Kawasaki, Japan; 23.84, 12.6, Ripero; 23.86, 12.7, Poyner; 23.88, 12.8, Poyner; 23.89, 12.8,
Poyner; 23.90, 12.7, Poyner; 24.05, 12.8, J. Bortle, Stormville, NY; 24.05, 12.4, Stewart;
24.07, 12.0:, Scovil; 24.07, 12.6:, G. Dyck, Assonet, MA; 24.12, 12.6:, Dillon; 25.88, 12.5,
Vanmunster; 25.90, 12.7, Vanmunster; 25.92, 12.8, Broens; 25.92, 12.8, Vanmunster; 25.94,
12.7, Vanmunster; 26.13,12.9, York; 27.13, 12.9, York; 27.86, 13.0, G. Poyner, Birmingham,
England; 28.13, 12.9, Dillon; 28.22, 13.4:, Royer; 29.11, 13.1:, J. Nordby, Moorhead, MN;
29.14,12.8:, Dillon; 29.19,12.8, A. Abbott, Leduc, Alberta, Canada.

Many thanks to those observers who have been calling/ emailing in their observations.
Please continue to observe UZ Boo and report your observations to AAVSO
Headquarters.

OUTBURST OF 2138+43 SS CYGNI

As the observations below indicate, the dwarf nova SS Cyg went into outburst on August
27. The last outburst of this popular dwarf nova occurred on June 21, 1994, when it
reached magnitude 8.3 and was bright for 23 days. Recent observations include:

Aug 23.17 UT, 12.3, W. Dillon, Missouri City, TX; 23.18, 11.9, R. Royer, Lakewood, CA;
23.93, 12.6, G. Poyner, Birmingham, England; 24.13, 12.0, Dillon; 26.17, < 11.4, Dillon;
27.26, 11.6, T. Burrows, Novato, CA; 27.30, 11.5, Royer; 27.38, 11.4, A. Dill, Wichita, KS;
28.04, 8.6, G. Zajacz, Debrecen, Hungary; 28.15, 8.8, Dillon; 28.15, 8.5, Burrows; 28.25, 9.0,
Royer; 28.39, 8.5, Burrows; 29.02, 8.5, Zajacz; 29.10, 8.9, J. Nordby, Moorhead, MN; 29.15,
8.4, Burrows; 29.15, 8.6, Dillon; 29.23, 8.6, Royer; 29.32, 8.3, Nordby.

Please monitor SS Cyg, and report your observations to AAVSO Headquarters.

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 Europe attending meetings and giving talks, and I thank you very
much for your astronomical efforts and contributions.

Good observing!

Elizabeth O. Waagen
Senior Technical Assistant

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