Messier Objects

M18: Open Star Cluster (Sagittarius) RA: 18h 19.9m / DEC: -17° 06'.0
Instrument: 10-inch Starfinder

M18 is a fine open star cluster that is often ignored in favor of the more impressive Swan Nebula just one degree to the north. Located in northern Sagittarius, M18 appears as a loose arrangement of 33 stars--8th through 14th magnitude--in my 10-inch Starfinder equatorial Newtonian at high magnification. The brightest members are those west of center in my sketch which was made at 129X. Another 50 field stars are presented as framework for this fine open star cluster.

M17-Swan Nebula M19


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Revised: February 10, 2002 [WDF]