NGC 166 (MCG -2-2-63)是鲸鱼座的一个螺旋星系，它有一个活动星系核，它的哈伯序列为Sa。它位于黄道以南。星等为14.5，赤经为35分48.8秒，赤纬为-13°36'38"。估计它距离银河系2.71亿光年，它的直径估计为7万光年。在它的附近还有两个星系IC 27和IC 28。
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