(IAAC) Obj: M18 - Inst: 4.5" Homemade Dobson reflector, f/8

[Ante Perkovic]

  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July 22nd 2004., 0:35h
Location of site: Kasjuni beach, Split, Croatia (Lat. 43.5 N, Elev. 0m)
Site classification: Suburban
Sky darkness: 5.0 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 25x, 48x, 79x
Filter(s): None
Object(s): M18
Category: Open cluster
Class:
Constellation: Sgr
Data: mag 6.9  size 9'
Position:
Description:
25x: The cluster reminds me of an arrow, something like
  "<-". Three brightest stars in the center form an
  arch and a few more stars can be seen around. Using
  averted vision, I counted 10 stars inside 4'x2' area.
48x: Three brightest stars make "/" of "<-" shape.
  To the S, 3 dimmer stars form "\" part. To the SW,
  3 more stars form "-" shape. Another 4 dim stars that
  are scattered around. Altogether, I see 13 stars.
79x: Nothing new.

M18 is almost 1 degree N of NE edge of M24, halfway to M17.