(IAAC) Obj: IC 418 - Inst: 17" f/15 classical Cassegrain equatorial mount
Observer: Dave Mitsky
Your skills: Advanced (many years)
Date/time of observation: 2000/12/18-19 02:20 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA, USA (Lat 40.15 d N, 76.9 d W, Elev 190 meters)
Site classification: Exurban
Sky darkness: ~5.0 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 17" f/15 classical Cassegrain equatorial mount
Magnification: 118, 144, 202, 249, 259, 404x
Filter(s): Orion UltraBlock
Object(s): IC 418
Category: Planetary nebula.
Data: mag 9.3 size 12"
Position: RA 5h:27.5m DEC -12d:47'
I was pleasantly surprised to find that IC 418 (the Raspberry or Spirograph
Nebula) presented a faint pink color through the 17". In the past I'd never
detected any color in this DSO using either the 17" or a 20" classical
Cassegrain belonging to a friend. (I was treated to seeing IC 418's remarkable
pink/red hue for the first time at the 1995 WSP through Ed Boutwell's 25" Dob.)
Magnifications used were 118, 144 (with and without an Orion UltraBlock filter),
202, 249, 259, and 404x, with the pink being most noticeable at 202x. The
UltraBlock filter did not enhance the view appreciably and completely eliminated
the pink shade.
IC 418 has a rather bright central star (10.17 magnitude according to the NSOG).
I quickly noticed that this unusual planetary exhibits a rather pronounced
See http://oposite.stsci.edu/pubinfo/PR/2000/28/ for a striking Hubble Space
Telescope image of IC 418.
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