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Re: (IAAC) Obj: IC418 (PK215-24.1) - Inst: 30CM, f:10 SCT; LX200
Jim, your observation of the "Raspberry Planetary"
stirred some old questions: seeing that red fringe
seems like a bit of a dark art! There are definite
reports of the color red in midsize scopes, like
this fine log from Dave Mitsky, using a 17.5":
http://www.visualdeepsky.org/logs/msg02065.html
Even more intriguing is an observation from Ron B.,
using just a 4" refractor! Interestingly the ruddy
color was only apparent to Ron at very low power -
essentially, when the planetary would still have
appeared basically stellar to him:
http://www.visualdeepsky.org/logs/msg02972.html
Yann Pothier, on the other hand - one of the most
experienced and careful PN observers reporting on
the Internet these days - did NOT log any reddish
color for i418 in 4.25" or 17.5" scopes, although
he did clearly see "pink" with a 22":
http://www.visualdeepsky.org/logs/msg01461.html
I'd be interested to hear of other observers who
have (and have NOT) logged non-blue-green colors
in this unusual little object! Clear skies,
Lew Gramer
> -----Original Message-----
> From: owner-netastrocatalog@atmob.org
> [mailto:owner-netastrocatalog@atmob.org] On Behalf Of Apache User
> Sent: Saturday, February 28, 2004 5:32 PM
> To: Internet Amateur Astronomers Catalog
> Subject: (IAAC) Obj: IC418 (PK215-24.1) - Inst: 30CM, f:10 SCT; LX200
>
>
> ----
>
> Observation Poster: James (Jim) Anderson <madmoon@bellsouth.net>
>
> Observer: James (Jim) Anderson
> Your skills: Intermediate (some years)
> Date/time of observation: 02212004/0240ut
> Location of site: W.Summerland Key, FL (Lat 24.6N, Elev 10')
> Site classification: Exurban
> Sky darkness: 6/10 <1-10 Scale (10 best)>
> Seeing: 8/10 <1-10 Seeing Scale (10 best)>
> Moon presence: None - moon not in sky
> Instrument: 30CM, f:10 SCT; LX200
> Magnification: 134X, 254X
> Filter(s): O-III
> Object(s): IC418 (PK215-24.1)
> Category: Planetary nebula.
> Class: 4
> Constellation: Lep
> Data: mag 10.7p size 12.0"
> Position: RA 05:27.4 DEC -12:41.8
> Description:
> 134X-IC418 appears as a tiny bright disc.
>
> 254X-IC418 appears as a small bright nearly featurless disc.
> It appears
> blue-green in color with a sharply defined outer edge and the
> edge seems
> slightly brihter than the center area. A center star seems
> quite bright and
> easy. No internal detail was decernible and the expected red
> rim was not seen
> in the 30CM. The O-III filter does not make much improvement.
> It mostly darkens
> the entire field, PNe included.
> --
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