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(IAAC) Obj: M27 Dumbell nebula colour observations - Inst: 20", f4.4, Newtonian reflector, dobsonian mount



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Observer: Nick Martin
Your skills: Intermediate (some years)
Date/time of observation: Sept 16/17 1998 22.00UT
Location of site: Bonnyton, Ayrshire, Scotland,UK (Lat 55 24m56s, Elev 120m)
Site classification: Rural
Sky darkness: 6( between clouds) <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 20", f4.4, Newtonian reflector, dobsonian mount
Magnification: X125, X186, X248, X550
Filter(s): None.
Object(s): M27 Dumbell nebula colour observations
Category: Planetary nebula.
Class: 
Constellation: Vul
Data: mag   size 
Position: RA :  DEC :
Description:
In an attempt to investigate what colours could be observed in M27, the
nebula was observed with an indoor light shining through a glass door to
avoid switching from photopic to scotopic vision.
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The colours were quite distinct.The bright N and S lobes of the dumbell
were green.  The rest of the nebula glowed with a reddish/brownish
hue. The north and south edges of the dumbell(beyond the brightest
parts) showed the reddest colouration.  The eye's colour response was
tested using a magenta, red, yellow and green pie chart on a white
background. By tilting the chart in relation to the light source its
brightness could be reduced to match the perceived brightness of the
brightest parts of the nebula. The yellow and green both were easily
perceived while the red and magenta appeared as a very dark red.
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