Caldwell 51 irregular
Caldwell 51, is located in the constellation Cetus, and is best seen in winter.
Caldwell 51 is magnitude 9.3, and is 12 x 11 in size. For reference, the full moon is 30' (arc minutes) or 0.5° in size.
* One can see up to magnitude 7-8 objects with perfect eyes under ideal dark sky conditions.
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