(IAAC) Obj: IC 418 - Inst: 40" f/5 dob


Observer: Mark G.Birkmann
Your skills: Intermediate (some years)
Date/time of observation: 10/13/99  
Location of site: New Haven, Missouri (Lat ~38, Elev ~700')
Site classification: Rural
Sky darkness: 5 <1-10 Scale (10 best)>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 40" f/5 dob
Magnification: lowest power 125x
Filter(s): OIII, H-beta, Orion Ultrablock
Object(s): IC 418
Category: Planetary nebula.
Class: 4
Constellation: Lep
Data: mag 10.7  size 12", central star mag. 10.1
Position: RA 05h:27m 28s  DEC -12:41' 50"
This small planetary showed a thin inner ring of  light blue nebulousity equal
in thickness to about one half the diameter of the bright central star. The
outer ring was equal in thickness to the diameter of the central star, was an
obvious red color, and was immediately adjacent to the inner ring.  The border
between the two rings was not sharply demarcated.  Rather, the blue ring faded
into the red ring over a short distance.  The red was not seen above 250x.  A 
drawing can be seen at:  
Optional related URLs: http://www.fortunecity.com/greenfield/twyford/637/astrobonw.html
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