Messier 73 was discovered by Charles Messier on October 4, 1780, who originally described the object as a cluster of four stars with some nebulosity. Subsequent observations by John Herschel, however, failed to reveal any nebulosity. Moreover, Herschel noted that the designation of M73 as a cluster was questionable. Nonetheless, Herschel included M73 in his General Catalogue.We now know that the asterism of four stars in the constellation of Aquarius is composed of physically unconnected stars that appear close to each other in the sky as seen from Earth. This image comprises 12 x Luminance (60 seconds each) and 10 x Red, Green and Blue (60, 60 and 48 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 40 degrees on 18 September 2015.The field of view of the image is 32’ x 21’.
Hills Observatory: 1 January 2013 to 30 March 2019