昴宿七的主星昴宿七A是一颗B型的蓝白色巨星,视星等为+3.62。它是一个分光双星系统,两颗恒星的视星等分别是+4.1和+5.6,旋转的周期为1250天。这个系统拥有一个伴星昴宿七B,视星等为+6.8等,距离主星0.4角秒(至少52天文单位)。
在左面穿透北极光依然闪亮的是著名的北方星座——北斗七星,在右面较远地方闪耀的是更紧凑的昴宿星团。
Brighter stars peering through the auroral glow at the left form the recognizable northern asterism, the Big Dipper. A more compact Pleiades star cluster shines at the far right.
很多星星拥有古名称——例如Aldebaran(毕宿五),在阿拉伯语中意为“追随者”,因为它看起来就像在天空中追随着昴星团,或者说七姐妹星团似的。
A number of stars have possessed names since antiquity - Aldebaran, for instance, means "the follower" in Arabic, as it seems to follow the Pleiades, or Seven Sisters star cluster, across the sky.
我们最后定居在一个新的恒星星团里,就是后来熟悉的七姊妹星,昴宿星。
We eventually settled in a new cluster of stars later to be known as the Seven Sisters, the Pleiades.
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