NGC/IC Project Restoration Effort

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NGC4561

 

Basic Information


Location and Magnitude


Right Ascension: 12:36:8.1
Declination: +19:19:18
Constellation: COM
Visual Magnitude: 12.5

Historic Information


Discoverer: Herschel W.
Year of discovery: 1785
Discovery aperture: 18.7

Observational


Summary description: pB, pL, vlE, lbM, r
Sub-type: SBcd

Corwin's Notes

===== NGC 4561 = IC 3569. Found by WH on 27 April 1785, observed again by JH in two sweeps, and rediscovered by Frost on a Harvard plate, there are no other galaxies in the area as bright or as large as this. It is a peculiar Magellanic irregular with two bright knots; one of these is a superimposed star. These would have led to JH's seeing the object as mottled, and Frost's description of two stars involved also fits. Curiously, JH's mean position from his two observations is within a few arcsec of the modern position from GSC, while Frost's photographic -- and presumeably more accurate -- place is further off. It may be this that led both Frost and Dreyer to include the galaxy in the second IC.

Steve's Notes

===== NGC 4561 18" (4/5/03): fairly faint, moderately large, round, 1.0' diameter, weak concentration in halo, but suddenly contains a very small brighter core.