(2000 superoutburst light curve by the VSNET QY Per collaboration team: Taichi Kato, Makoto Uemura, Gianluca Masi, Alessia Cassetti, Lew Cook, Katsura Matsumoto, Lasse Teist Jensen, Brian Martin, Tonny Vanmuster, Denis Buczynski)
In 1999 December 28, M. Simonsen detected a very rare outburst of QY Per at 13.6mag (vsnet-alert 3867). T. Vanmunster reported the light curve he obtained on December 29/30 clearly showed 0.20mag superhumps (vsnet-alert 3875). The VSNET collaboration team (http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/qyper.html) performed time-series observations throughout this superoutburst and determined its average superhump period to be 0.07861 day (vsnet-alert 3905, 3921, 3926, 3949).
G. Masi and A. Cassetti presented a light curve at: http://www.eurolink.it/comets/qyper3.gif, and reported the superhump amplitude of 0.4mag and the period of 0.078 from their observations in early phase (vsnet-alert 3922, 3927). T. Vanmunster reported the superhump amplitude of 0.40mag from his January 5 observation (vsnet-alert 3944). L. Cook presented his observations at: http://www.geocities.com/lcoo/QYPer545.gif,http://www.geocities.com/lcoo/qyper.htm, and the superhump amplitude of ~0.3mag and its period of 0.0785 day on 1999 December 30 (vsnet-alert 3923, 3945). On January 9, T. Vanmunster reported it entered its rapid decline stage (vsnet-alert 3995, 4015).