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(IAAC) Obj: NGC6309 (Box Nebula) - Inst: 4.5" Homemade Dobson reflector, f/8



  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: August 11th 2003, 23.30h
Location of site: Tugare, near Split, Croatia (Lat 43.4 N, Elev 250m)
Site classification: Rural
Sky darkness: 5.0 <Limiting magnitude>
Seeing:
Moon presence: None - moon not in sky
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 25x, 48x, 79x
Filter(s): None, UHC
Object(s): NGC6309 (Box Nebula)
Category: Planetary nebula
Class:
Constellation: Oph
Data: mag 11.6  size 20"x10"
Position:
Description:
  25x: Invisible with both direct and averted vision. With UHC, I 
couldn't see a thing in the entire FOV.
  48x: Small, very faint, undoubtedly fuzzy object popped up for a 
moment and went back to darkness.
  79x: Visible 1/3 of the time. Averted vision helps a little. This 
planetary is very faint, small, but undoubtedly fuzzy. UHC just showed 
total darkness.
The nebula was 22 deg above the horizon.