Heinrich d'Arrest discovered NGC 592 = Au 14 in M33, along with NGC 588, on 2 Oct 1861 with the 11-inch Fraunhofer refractor in Copenhagen. His micrometric position (measured on 3 nights) is fairly accurate. Auwers included the discovery in his 1862 catalogue of new nebulae.

In March 2020, Yann Pothier found an earlier discovery by R.J. Mitchell, the observer on Lord Rosse's 72" on 7 Dec 1858. His excellent sketch in the 1862 publication (plate 26, figure 10) includes NGC 592 at the right edge.

300/350mm - 13.1" (8/15/82): fairly easy HII region with averted vision.

400/500mm - 17.5" (7/5/86): faint nebulosity in M33 9' WSW of the core. Forms the vertex of an obtuse isosceles triangle with NGC 588 6' W and NGC 595 6' NE.

Notes by Steve Gottlieb