(IAAC) Obj: M54 - Inst: 4.5" Homemade Dobson reflector, f/8

  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July 22nd 2004., 0:10h
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): M54
Category: Globular cluster
Constellation: Sgr
Data: mag 7.7  size 9.1''
25x: round fuzzy, 2'10" in diameter. Central 45" is somewhat brighter.
48x: The same size, but it looks a little better.
79x: Central bright part grew to 1'. Still no granularity nor individual 
M54 is the easternmost of 3 Messier globulars in the southern Sgr and 
can be found 1 deg 45' W-SW from star Ascella (Zeta Sgr, m=2.6).
Few years ago, it was discovered that M54 is actually the core of 
Sagittariud Dwarf galaxy.