NGC 6603
NGC 6603 is an open cluster discovered by John Herschel on July 15, 1830 located in Sagittarius constellation.
Situated within the brightest part of star cloud M24, it is classified by Shapley as type "g". This cluster consists of about 30 stars in a field of about 5 arc minutes in diameter, and is about 9400 light years remote. Thus its linear diameter should be about 14 light years. The hottest stars are about B9, and the brightest of photographic mag 14.