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Updated: May 19, 2025
With the slightest magnifying this object splits up into two stars, of magnitudes four and seven, situated rather more than 40" apart. Next we shall need a rather low-power eyepiece and our largest aperture in order to examine a star cluster, No. 4173, which was especially admired by Sir William Herschel, who discovered that it was not, as Messier had supposed, a circular nebula.
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