NGC 6891 (Planetary nebula)
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Right ascension: 20h 16m
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Declination: 12° 44'
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Constellation: Delphinus
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Date/time: 2009.08.20 23:45 UT
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Equipment: 12" f/5 Newtonian
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FoV: 13'
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Magnification and filter(s): 250x + UHC-S filter(s)
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Seeing: 5/10
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Transparency: 5/5
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Location: Tarján, Hungary
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Observer: Ferenc Lovró
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Description:
A very tiny but bright planetary nebula, which looks pretty much star-like at small powers, but above 100x it starts to show some dimensions, looking like a blurred star. At 250x it seems quite large, without a filter it has some nice bluish colour. With an UHC filter and especially with averted vision its diametre grows even larger. Because of its small size it's very hard to discover any details, but by the time it looks as if the core has some tiny horn eastwards. SQM reading: 21.01 m/arcsec^2 9°C.
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Hi-resolution image: [ reversed sketch | original sketch ]
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