(IAAC) Obj: M23 - Inst: 4.5" Homemade Dobson reflector, f/8

  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July 18th, 2004. 0:20h
Location of site: Konjevrate, near Sibenik, Croatia (Lat. 43.6 N, Elev. 
Site classification: Rural
Sky darkness: 6.5 <Limiting magnitude>
Seeing: 9.5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 28x, 53x
Filter(s): None
Object(s): M23
Category: Open cluster
Constellation: Sgr
Data: mag 5.5  size 27'
28x: 45 to 50 stars inside 25'x15' ellipse. The stars are moderately 
  and almost all are of the same brightness.
53X: 50 to 55 stars inside the same 25'x15' area.
This is a very nice cluster, a real gem compared to some other open 
clusters in this area!