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M1-92 (Planetary nebula)
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Also known as: Minkowski 92, Footprint nebula, Minkowski's footprint
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Right ascension: 19h 36m
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Declination: 29° 32'
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Constellation: Cygnus
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Date/time: 2017.08.14 22:10 UT
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Equipment: 12" f/5 Newtonian
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FoV: 6'
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Magnification and filter(s): 652x
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Seeing: 9/10
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Transparency: 4/5
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SQM: 21.05 m/as2
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Temperature: 15°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: 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: Talpa Minor Observatory
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Observer: Ferenc Lovró
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Description:
This protoplanetary nebula is much fainter than what I expected, but it has an easy location so it's very easy to recognize. At 71x it is completely stellar. At 250x you can suspect that it is an extended object. However, to be able to fully understand the nature of this object, you need to go into extreme magnification levels. Fortunately I had an excellent seeing this evening, so I was able to use my 2.3mm eyepiece (for the first time in the past decade) and view the object at 652x. It has a strong NW-SE elongation, and the shape of an eye. Its NW side is brighter and it has the shape of a drop. The SE side consists of a faint arc and an area that is even fainter and completes the eye shape. Between the two sides of the protoplanetary nebula a thin slit can be seen. The most interesting feature of this object is that it definitely looks blue!
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Hi-resolution image: [ reversed sketch | original sketch ]
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gmail*com.
ikonra kattintva magyarul is olvashatod az észlelést.
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