Caldwell object C81 is a globular cluster located within the constellation Ara. Caldwell C81 is best viewed during Summer, is magnitude 8.1*, and can be viewed with binoculars. It is 8.1 in size. For reference, the full moon is 30' (arc minutes) in size.
- globular cluster
- 17 25.5
- -48 25'
* The naked eye can see up to magnitude 8 objects under ideal dark sky conditions.
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