张钰哲致力于观察和计算小行星和彗星的轨道。
He devoted himself to observing and calculating the orbits of minor planets and comets.
国际小行星中心将3789“中国号”小行星的发现归功于张钰哲，将2051号小行星命名为“张钰哲星”。
Zhang Yuzhe is credited by the Minor Planet Center for the discovery of 3789 Zhongguo under the name "Y. C. Chang". The asteroid 2051 Chang is named after him.
张钰哲研究小行星的光变曲线和旋转、CZ仙后座变星以及哈雷彗星轨道的变化。
He studied the light curves of asteroids and thus their rotation, and also studied the variable star CZ Cassiopeiae, and the evolution of the orbit of Comet Halley.
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