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   51264
   The X-ray emission from comets has been discovered for Comet Hyakutake
   (C/1996B2) by ROSAT. However, the origin of the X-ray emission is not
   clear. In order to understand the mechanism, we propose to observe
   Comet Hale-Bopp (C/1995O1), which will be one of the great comets ever
   appeared. The proposed dates are October 1 and December 5 after its
   perihelion passage, when the comet comes into the observable region by
   the ASCA.
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