NGC 6397 is a globular cluster in the constellation Ara. This globular cluster contains about 400.000 stars and is 7.800 light years away from earth. NGC 6397 has undergone a core collapse, meaning that the core has contracted to a very dense stellar agglomeration.

ASA RC 400 f/8
ASA DDM 100
LRGB 90 60 60 60 min.