M39 - An Open Cluster
From the author of Sizing Up The Universe
20:51 EDT Nov 2, 2010.
Starlight Express SXV-H9 on 4" Tak FSQ refractor at f/5.
R = G = B = 5*12 seconds.
20:51 EDT Nov 2, 2010.
Starlight Express SXV-H9 on 4" Tak FSQ refractor at f/5.
R = G = B = 5*1.2 seconds.