井宿四
井宿四，又名“双子座ξ星”，是一颗位于双子座的恒星。它是双子座所代表双胞胎四只脚中的一只。井宿四原名Alzirr，意为花蕾。它的光谱分类属于F6，视星等达到3.35，可以在夜晚通过裸眼观测到。通过恒星视差测距，井宿四距离地球大约有58.7光年（18.0秒差距）。
根据J2000.0纪元的座标，井宿四位于:
- 赤经: 6h42m30s
- 赤纬: +12°57'0"
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