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(IAAC) M27 Dumbell 20 " Dob Newtonian OIII filter
Observer:N.J.Martin
Your skill:intermediate
Date and UT of observation:22 September 1997 23.00
Location & latitude:near Ayr South West Scotland lat 55 24'56"
Site classification:bright rural
Limiting magnitude (visual):6 (zenith) 4 at altitude 11 degree of nebula
Seeing (1 to 5 - best to worst):2
Moon up (phase?):no
Instrument:20" f4.4 Dobsonian
>Magnification:X150
>Filters used:Lumicon OIII
>Object:M27 Dumbell nebula
>Category:Planetary nebula
>Constellation:Vulpecula
>Object data:mag 7.6 8'X5'
>RA/DE: RA 19 59.6' Dec 22 43'
>Description: The dumbell shape is made much less obvious by the elliptical
nebula which surrounds it. The nebula filled much of the field of view in
the eyepiece used. The OIII filter is very effective with this planetary and
gives a dark background for the large pale ellipse with the dumbell shape
superimposed and somewhat overlapping the centre. Structure is visible
within the nebula.
Finding the nebula. Take the bright tip(gamma) of Sagitta at an angle of 120
degrees to the axis of the arrow and about three degrees north is a fifth
magnitude star.. The dumbell is just below this and should be visible in a
finder. beware in right angle finders where orientation is difficult. There
is another arrow like asterism near Sagitta which can be confusing in the
finder. I keep making this mistake.
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| nmartin@bonnyton.u-net.com |
|"There are more things in heaven and earth ... than are dreamt of in your
philosophy" (Hamlet, Act 1, Sc. 5) |
Bonnyton House, Ayrshire,Scotland, UK. lat 55 24'56" N long 4 26' 00" W
Altitude 150 m.
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