Charles Messier discovered M90 = NGC 4569 on 18 Mar 1781. WH observed M90 on 8 Apr 1784 (sweep 187) and logged "pL, with a nucleus, perhaps cometic, but moonlight permits not to give a proper description." JH did not make an observation.

400/500mm - 17.5" (4/25/87): bright, large, very elongated 3:1 SSW-NNE, sharply concentrated, suddenly increases to a bright stellar nucleus (possibly a superimposed star), fairly even surface brightness to halo. IC 3583 lies 6' NNW.

Notes by Steve Gottlieb