NGC/IC Project Restoration Effort

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NGC4656

 

Basic Information


Location and Magnitude


Right Ascension: 12:43:58.1
Declination: +32:10:11
Constellation: CVN
Visual Magnitude: 10.5

Historic Information


Discoverer: Herschel W.
Year of discovery: 1787
Discovery aperture: 18.7

Observational


Summary description: !, pB, L, vmE 34°, sp of 2
Sub-type: SBm

Steve's Notes

===== NGC 4656 18" (5/14/07): this fascinating galaxy forms one of the most striking pairs in the sky with NGC 4631 32' NW. At 220x, the distorted shape extends ~9'x1.5' in a SW-NE orientation. On first glance, it appears the bulging core is offset at the SW end, though with averted vision a very low surface brightness broader extension continues to the the SW of the core for several arcminutes before fading into the background. The core is very bright and mottled with a bright knot (HII region) jutting out to the west at the southwest end of the core. The NE extension has a remarkable, fairly bright 2' extension (NGC 4657), hooking to the east at a 45¡ angle from the major axis (the "blade" of the hockey stick). There is a small, faint, detached knot beyond the east end of the "blade" that appears to have broken off. The unusual bend and knot at the NE end is a result of a prior tidal interaction with its more massive neighbor, NGC 4631. 13.1" (4/10/86): striking!, fairly bright, very elongated SW-NE. Appears wider and brighter at the SW end. The NE end hooks sharply east to merge with NGC 4657 which may be a part of NGC 4656 and not a separate galaxy. A star or knot is attached at the south end. Appears like a celestial hockey stick!