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(IAAC) Obj: IC1318 - Inst: 20" f4.4 Dobsonian Mount



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Observation Poster: Nick Martin <bonnyton@ednet.co.uk>
Observer: Nick Martin
Your skills: Intermediate (some years)
Date/time of observation: 24/25 August 2001  00:00UT
Location of site: Bonnyton House,Ayr,Scotland, UK (Lat 55 25m, Elev 500ft.)
Site classification: Exurban
Sky darkness: 6.0 <Limiting magnitude>
Seeing: III <I-V Seeing Scale (I best)>
Moon presence: None - moon not in sky
Instrument: 20" f4.4 Dobsonian Mount
Magnification: X80, X180
Filter(s): UHC,OIII
Object(s): IC1318
Category: Emission nebula.
Class: 
Constellation: Cyg
Data: mag ?  size 210' X140'
Position: RA 20:2625  DEC 40:20
Description:
Object Rating: B+
This is a huge mass of complex strands of nebulosity. A brighter patch is centred
around R.A.20 18' Dec.41.9. It is conspicuous even in a 35 mm.eyepiece fitted 
with a UHC filter. A long bar of nebulosity runs roughly diagonally from NW to 
SE. It appears to bifurcate from a roughly circular patch with one branch going
SE. The other branch, which runs SW, can be traced for 40' through fields 
containing many faint stars. Preceding this there are two streaks of nebulosity
running roughly parallel to each other through a compact patch of brighter 
stars.
In another field in the area, where there is a group of stars clustered around a 
brighter star, streaks of nebulosity are traceable across the whole of a 20' 
field.
In the area of the nebula close to and following  gamma Cygni, the brightest 
part of the nebula is between two stars,mag 6.6 BD +39 4186, mag.7.2 BD +39 4193
and the 12 stars of the small cluster DO-10 to the south of them. This 
nebulosity is divided by a dark lane and is most clearly visible south of the 
lane.  There are brighter patches and mottling is visible using a UHC filter. 
The brightest and most mottled nebulosity lies 10-15' south of the magnitude 6.6
star. South of this the nebulosity fades and a triangular dark patch extends 
into DO-10.
Preceding the magnitude 6.6 star there is more mottled nebulosity with some 
brighter patches.
The brighter parts of the nebula are visible without filtration but visibility 
is enhanced by the use of a UHC filter. An OIII filter supresses the nebulosity 
completely. While an observer reporting on Amastro mentions that an H-beta 
filter greatly enhances its visibility. This suggests that IC1318 might provide 
another target to extend the range of objects observable with advantage using 
H-beta filters. Sadly I do not possess one to report on.     
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