NGC 6910 (Open cluster)
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Also known as: Rocking Horse cluster
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Right ascension: 20h 24m
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Declination: 40° 48'
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Constellation: Cygnus
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Date/time: 2009.06.19 00:00 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: 7/10
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Transparency: 4/5
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Location: Nádasdladány, Hungary
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Observer: Ferenc Lovró
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Description:
This tinny little object is also known as the Rocking Horse cluster. The name says it all: it really looks like a little horse jumping around the space. Although it's in a quite easy position, it still is a neglected object, as when it comes to Cygnus, everyone thinks of nebulae like the Veil and its companions, and the tiny shiny planetaries. Too bad, because this cluster is a real gem! It's special features are the two brightest stars of the cluster (at the front leg and the eye), that are apparently yellow, even though their spectral class suggests a rather white colour. This optical illusion is caused by the interstellar dust that is so common through Cygnus. A very important hint: you should use a fairly high magnification when looking at this object, because it's located in a field that is rich in bright stars, which makes it harder to detect the real shape of the cluster.
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Hi-resolution image: [ reversed sketch | original sketch ]
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