NGC/IC Project Restoration Effort
(This is a very very beta version)
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
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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
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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.