NGC 4631 + NGC 4656 (Galaxy)
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Also known as: Whale galaxy + Hockeystick galaxy, Arp 281
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Right ascension: 12h 44m
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Declination: 32° 18'
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Constellation: Canes Venatici
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Date/time: 2009.04.24 21:30 UT
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Equipment: 12" f/5 Newtonian
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FoV: 1° 18'
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Magnification and filter(s): 45x
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Seeing: 5/10
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Transparency: 2/5
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Location: Nádasdladány, Hungary
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Observer: Ferenc Lovró
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Description:
The gigantic, shiny NGC 4631 (also known as the Whale galaxy) and its smaller and much fainter companion, the NGC 4656 (or Hockeystick galaxy) fit perfectly well in an eyepiece with at least 1 degrees of FoV, a very spectacular double. The 4631 is about 10m bright and just about to jump right out of the eyepiece, while the latter is much smaller with a brightness of about 11m only - estimated by me. Both galaxies are heavily distorted because of gravitational tidal forces between the two, not to mention that there's a tiny faint third companion very near NGC 4631 with the identifier NGC 4627 with a brightness of 13m. This galaxy remained hidden to me at this observing session and I could not make out the real hockey stick shape of NGC 4656 out either, possibly the bad transparency and seeing was not really helping me in this. The pair NGC 4631 and 4627 is also listed in Halton Arp's catalogue with number 281.
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Hi-resolution image: [ reversed sketch | original sketch ]
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