The Near-Nuclear Study of Comet Hale Bopp

The wavelet transform is applied to studying the near-nuclear region of Comet Hale-Bopp. The transform suppresses the comabackground to enhance visibility of comafeatures such as jets and shells from which apparent expansion speed is measured.Furthermore, two cometary bursts of this comet were found on April 22 and Sept.10-11.1996.The latter one coincides with a strong increase in the luminosity in X-rays almost at the same time.During the outburst, two globular ejecta were found, and their expanding speeds were about 100m/s.In addition, the projected rotation period is derived.