Trumpler 3 + PNG138.1+04.1 (Open cluster)
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Also known as: Tr 3
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Right ascension: 3h 12m
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Declination: 63° 15'
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Constellation: Cassiopeia
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Date/time: 2008.01.26 20:00 UT
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Equipment: 12" f/5 Newtonian
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FoV: 45'
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Magnification and filter(s): 71x
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Seeing: 5/10
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Transparency: 3/5
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Location: Nádasdladány, Hungary
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Observer: Ferenc Lovró
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Description:
This open cluster is located in a star field that's free from bright stars. Its most remarkable figure reminds me of a reaping-hook, and is composed by four stars between magnitudes 9 and 10. These are also considered the brightest members of the cluster, besides these only a couple of stars of 8-10m are visible in the field of vision, but most of the members are fainter than 12m. For about 20' to the south is the planetary nebula PNG138.0+04.1, but its nebulosity can only be suspected even by using averted vision - the large, 5.5' diameter planetary cannot really be seen even with the UHC filter on. However, its 13m central star can be found and a little haziness can be detected next to this star that is probably illuminated by the brighter stars next to the central one.
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Hi-resolution image: [ reversed sketch | original sketch ]
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