The Leo Triplet
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ASI2600MM, LRGB 4x 1.1h (4.4h)
The so called Leo Triplet is a prominent group of galaxies M65, M66 and NGC3628 in a distance of about 35 million lightyears.
It is assumed, that the three galaxies interacted a long time ago, since on longer exposures a tidal stream inbetween becomes visible.
While M65 and M66 were discovered by Charles Messier in 1780, he missed the much fainter galaxy NGC3628. It was William Herschel in April 1784, who first documented it.