房宿三

房宿三（δ Sco / 天蝎座δ）是天蝎座的恒星，俗名Dschubba（也作Dzuba，源于阿拉伯语jabhat，意为“(蝎子的)前额”）或Iclarcrau，或Iclarkrav。由于靠近黄道，房宿三可能被月亮和行星（极少）遮挡。

亮度变化2000年6月, Sebastian Otero观测到房宿三比平时亮了0.1个星等。从那以后，该星的亮度一直达到1.6或1.7星等。之后通过光谱分析发现房宿三从其赤道区域抛射出明亮的气体。尽管亮度变化，它的亮度始终在先前的亮度之上。伴星房宿三的B光谱型伴星围绕主星以20天的周期旋转，二者的距离大致等于水星离太阳的距离。Furthermore, there is a star that takes about 10 years to orbit Dschubba in a highly eccentric orbit that takes it close in to the primary once a decade. The last close encounter of these two stars happened in mid-2000 and it may have triggered the outburst of the primary star. A possible fourth companion star lies at about twice the distance again from the main star.