|M39: Open Star Cluster (Cygnus) RA: 21h 32.2m / DEC: +48° 27'.0|
Instrument: 10-inch Starfinder
M39 is a bright sprawling open star cluster in northern Cygnus. You'll find this 4.6 magnitude cluster just 2.5 degrees southwest of 4.2 magnitude 81 (Pi2) Cygni. My drawing records 54 cluster and field stars, the brightest being about 6th magnitude, and is based on the view in my 10-inch at 129X. M39 extends over an area nearly 30' in diameter, equal in size to the full Moon.
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Revised: February 10, 2002 [WDF]