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

AAVSO Special Notice #144

Superoutburst of the dwarf nova QZ Vir
January 26, 2009

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:

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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