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NGC 40 (Planetary nebula)
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Also known as: Bow Tie Nebula
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Right ascension: 0h 14m
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Declination: 72° 36'
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Constellation: Cepheus
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Date/time: 2012.09.11 23:30 UT
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Equipment: 12" f/5 Newtonian
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FoV: 7'
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Magnification and filter(s): 469x
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Seeing: 7/10
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Transparency: 3/5
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SQM: 21.25 m/as2
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Temperature: 11°C
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Humidity: low
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Wind: none
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Sight: 4 - lots of details, very interesting, unique look
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Difficulty: 4 - hardly visible, dark adaptation and very dark skies needed, averted vision is required to see details
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Position: 3 - moderate, some starhopping needed
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Location: Nádasdladány, Hungary
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Observer: Ferenc Lovró
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Description:
A wonderful yet tiny little planetary. At small magnification (71x in my case) it looks like a slightly defocused star, however by increasing the power it soon starts to develop into a nice, perfectly round planetary nebula. Some details that also appea: to the South of the bright central star you may notice a small brighter blob, and to the West a bright feature can be seen that resembles a spiral arm of a galaxy. Doesn't react at all on UHC filter, but with an O-III it's size apparently grows, however the central star completely disappears, which is a bit weird, because the Westward star stays in the field even if it's fainter than the central star of the nebula. With low power it has a tint of purple-blue.
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Hi-resolution image: [ reversed sketch | original sketch ]
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ikonra kattintva magyarul is olvashatod az észlelést.
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