|Observation data (w:J2000 epoch)|
|Right ascension||17h 56.8m|
|Distance||2.15 kly (659 Pc)|
|Apparent magnitude (V)||6.9|
|Apparent dimensions (V)||27.0′|
|Other designations||NGC 6494|
M23 is at a distance of about 2,150 w:light-years away from w:Earth, its radius is around 15-20 w:light years. There are some 150 identified members in this cluster, the brightest being of magnitude 9.2. M23 can be found with a modestly sized w:telescope in the rich starfields of the Sagittarius w:Milky Way.