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(IAAC) Obj: NGC3918 - Inst: 20" f5 dobsonian
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Observer: Andrew Murrell
Your skills: Advanced (many years)
Date/time of observation:
Location of site: Ilford NSW Australia (Lat , Elev )
Site classification: Rural
Sky darkness: <Limiting magnitude>
Seeing: <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 20" f5 dobsonian
Magnification: 160-700
Filter(s): none
Object(s): NGC3918
Category: Planetary nebula.
Class:
Constellation: CENT
Data: mag 8.1 size 12"
Position: RA 11:50.3 DEC -57:11
Description:
NGC3918 is one of the best southern planetaries. It appears as a 30" bright
aqua ball of even surface brightness. The colour is one of the strongest that I
have ever seen in any astronomical object. No central star is visible, even when
listed at 13.24 mag. The planetary has a sharp edge even at high power, and no
faint halo was glimpsed about the planetary though it has been photographed.
A star of 10th magnitude is positioned 10' northeast? (did not note properly)
Of the nebula and was orange in colour giving a nice contrast. A scattering of
15-16th magnitude stars is positioned just southwest of the object. No OIII
filter was used as previous observations had shown that it does not improve
the view, it just ruins the colour. The planetary is just visible in my 90mm
finder as a star. An 8" scope will show the nebula's colour.
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