斯万彗星（Comet SWAN）与鸟类“天鹅”没有实际关系（英文SWAN是天鹅的意思），SWAN是太阳风各向异性 (Solar Wind ANisotropies) 探测器的简称，它搭载在人造太阳卫星SOHO上。据我的理解，SWAN彗星是在SWAN所拍照片上发现的彗星，今年成为明星的这一颗，编号C/2006 M4，前面曾经介绍过，现在它在猎犬座，照片中它与旋涡星系 NGC 5005在同一视野里出现，彗星离我们9光分，NGC5005则在6000万光年以远。
来源：APOD TODAY
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