Caldwell 40 spiral
Caldwell 40, is located in the constellation Leo, and is best seen in spring.
Caldwell 40 is magnitude 10.9, and is 3 x 2 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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