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(IAAC) Obj: M16 (Eagle Nebula) - Inst: 4.5" Homemade Dobson reflector, f/8



  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July 22nd 2004., 0:55h
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, 140x
Filter(s): None
Object(s): M16 (Eagle Nebula)
Category: Open cluster, Emission nebula
Class:
Constellation: Ser
Data: mag 6.0  size 7'
Position:
Description:
  25x: At first glance, I see no trace of nebulosity, but cluster od 10 
stars inside 3'x5' area and 6 more scattered stars to the SW. One of the 
10 stars in the NE part is close double, with faint granular nebulosity 
that calls for greater magnification.
  48x: 2 more stars pop in in the SW part (now I see 8 stars), while 
number of stars in the NE rises to between 13 and 15, 3 to 4 of them in 
the central 20" area. I showed it to my friend Igor and he saw a faint 
nebulosity around the stars. After I covered my head with the T-shirt 
and stared for a few minutes, I also saw very faint nebulosity.
  79x: 9 to 10 stars scattered in the SW, 14 stars in the NE. Very 
compact center of the NE part calls for more power.
  140x: 14 stars in the NE. Central parts finally clears and I see 4 
stars in a slightly curved arch.
M16 is around 2 deg. 20' N of M17 and it's the northernmost Messier 
object in this part of the sky (nearby M26 is 8 deg. to the NE, while 
objects in Sgr are mutually much closer).