PKS 2155-304是已知最明亮的活躍星系之一,屬於蝎虎座BL型天體,在天球上位於南魚座。
PKS 2155-304在電磁波譜上是從無線電波到高能輻射的強發射源,其紅移值z = 0.116 (Falomo, Pesce & Treves 1993)。它是最明亮和被研究最多的蝎虎座BL型天體之一,並且常被認為是X射線選擇蝎虎座BL型天體的原型[1]。
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