M 39

M39 is a very large but very loose open cluster, situated some 9 degrees east and a bit north of Deneb (Alpha Cygni). Its distance is only about 800 light years, and it is of intermediate age (estimates between 230 and 300 million years). 30 stars are proven members and contained in a volume of about 7 light years diameter.

This cluster is best observed with lowest powers.

Right ascension	05 : 25.3 (hours : minutes)
Declination	+35 : 48 (degrees : minutes)
Distance	4200.0 (light-years*10^3)
Visual magnitude	7.4