Asteria — interactive night sky map
NGC 6231 is a open cluster in the constellation Scorpius with an apparent magnitude of 2.6, spanning about 14 arcminutes. Under dark skies it can be spotted with the naked eye.
It is best placed in the evening sky around June. It is visible from the whole southern hemisphere and from northern latitudes up to about 48°N. It is circumpolar (never sets) south of latitude 48°S.