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NGC 7139 (Planetary nebula)
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Right ascension: 21h 46m
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Declination: 63° 47'
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Constellation: Cepheus
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Date/time: 2017.08.15 21:50 UT
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Equipment: 12" f/5 Newtonian
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FoV: 12'
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Magnification and filter(s): 250x
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Seeing: 6/10
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Transparency: 4/5
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SQM: 21.34 m/as2
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Temperature: 14°C
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Humidity: dry
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Wind: none
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Sight: 3 - definite details, interesting look
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Difficulty: 5 - almost invisible, total dark adaptation, very dark skies and averted vision is a must to see the object
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Position: 3 - moderate, some starhopping needed
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Location: Talpa Minor Observatory
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Observer: Ferenc Lovró
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Description:
Very faint planetary, its edge is very hard to define. It's perfectly spherical, but this shape is obvious mostly with averted vision only. Its Western side looks brighter and almost invisibly but I do detect a slightly darker band in the middle of the surface in the N-S direction, which touches the Northern edge of the planetary nebula. The object is huge, but it is still very difficult to find due to its faint surface brightness.
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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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