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仙(xian)(xian)王(wang)(wang)座(zuo)MY（MY Cephei）是(shi)一顆位(wei)(wei)于(yu)(yu)仙(xian)(xian)王(wang)(wang)座(zuo)的(de)紅特超巨星(xing)(xing)(xing)，位(wei)(wei)于(yu)(yu)仙(xian)(xian)王(wang)(wang)座(zuo)的(de)疏散星(xing)(xing)(xing)團NGC 7419中(zhong)，是(shi)一顆已知體積(ji)最(zui)(zui)大(da)(da)的(de)恒星(xing)(xing)(xing)之一。其(qi)半(ban)徑(jing)是(shi)太(tai)陽的(de)2061倍，僅次于(yu)(yu)史蒂文(wen)森2-18（2158倍太(tai)陽半(ban)徑(jing)）和大(da)(da)犬座(zuo)VY（2069倍太(tai)陽半(ban)徑(jing)）。它是(shi)一個半(ban)規則(ze)變星(xing)(xing)(xing)，視星(xing)(xing)(xing)等最(zui)(zui)大(da)(da)為+14.40，最(zui)(zui)小為+15.50，其(qi)恒星(xing)(xing)(xing)光譜是(shi)M7.5I C。仙(xian)(xian)王(wang)(wang)座(zuo)MY位(wei)(wei)于(yu)(yu)赤經(jing)22時54分31.6975860144秒(miao)，赤緯+60° 49′ 38.970114015″，距離地球3513.18光年。