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   61223
   Detecting a X-ray from very distant cluster of galaxies and measuring
   physical quantities of very distant cluster of galaxies are one of the
   prime objectives for ASCA. However, only one measurement of temperature
   and metalicity by ASCA has been reported for clusters at z>1, that is a
   dark cluster reported by Hattori et al.(1997). Because of the potential
   importance and possibility of temperature and metalicity measurement
   for very distant cluster of galaxies by ASCA, we propose a deep
   observation of an optical spectro-scopically identified galaxy cluster
   candidate CFRS1415+52 at z=1 which is one of the most secure rich
   clusters of galaxies at z>1.
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