AAVSO Special Notice #144: Superoutburst of the dwarf nova QZ Vir

The dwarf nova QZ Vir (== T Leo) is currently in outburst, and it appears
that this outburst is a supermaximum.  The most recent visual estimate of
QZ Vir puts the star at m(vis)=10.2 (JD 2454857.6201; W. Kriebel, 
Walkenstetten, Germany).  Time series photometry by W. Stein (New Mexico, 
United States) on 2009 Jan 25 indicates the presence of superhumps in the 
light curve.  Observations by P. Schmeer (Saarburecken-Bischmisheim, 
Germany), E. Morelle (Lauwin-Planque, France), ASAS-3 (Pojmanski 2002, AcA
52, 397) and R. Stubbings (Tetoora Road, Vic., Australia) published on VSNET
(T. Kato; vsnet-alert 10980) suggest QZ Vir may have had a short precursor 
outburst lasting 2-3 days and fading immediately before the rise to 
supermaximum.  All observations, including both visual estimates and CCD 
time-series photometry, are strongly encouraged at this time.

QZ Vir is located at the following (J2000) coordinates:

RA: 11 38 26.80 , Dec: +03 22 07.0


Charts for QZ Vir may be plotted using the AAVSO Variable Star Plotter:

http://www.aavso.org/observing/charts/vsp/index.html?pickname=QZ%20Vir


Please report all observations to the AAVSO using the name "QZ Vir".
Please note that the name of this object is now formally "QZ Vir",
and this name should be used instead of "T Leo".  The AUID of this
star is "000-BCW-196".

This AAVSO Special Notice was prepared by M. Templeton.

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