NGC 6939 - Open Star Cluster

Near the extreme western edge of Cepheus is the open cluster NGC 6939. Through a small telescope it appears about 5' in diameter and shines with a total light equivalent to a 10th-magnitude star. In their book Revue des constellations, R.Sagot and J.Texereau describe NGC 6939 as : "Not very notable in a 3-inch 18-power refractor; a round milky spot with very faint stars in a 3¾ inch at 45X." In the catalogs, this open cluster is listed as being fainter than NGC 188, but is far easier to pick up because the stars are concentrated in a smaller area of sky. A 10-inch shows a sprinkling of stars. And only about 1° to the southeast, just over the border into Cygnus, is the fine galaxy NGC 6946. This spiral is easily seen in even small telescopes. It shines at 9th magnitude and is roughly 10' across

Telescope:	TMB 152 F8 APO refractor
Focal Length:	1200 mm
Mount:	Takahashi NJP 160
Camera	Starlight XPress MX916
Guider:	SBIG STV Guider
Exposures:	Multiple 20 second exposures
Location:	Cicero, IN
Software:	AstroArt