IC 1805, also known as the "Heart Nebula" and Sharpless 2-190, is an emission nebula in the constellation of Cassiopeia. It lies at a distance of ~7,500 light-years away, in the Perseus Arm of the Galaxy. It was discovered by William Herschel on 3 November 1787.The very brightest part of this nebula (the knot at the western edge) is separately classified as NGC 896, because it was the first part of this nebula to be discovered.The nebula's intense red output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun's mass.The first image comprises 5 x Ha, OIII and SII, all 300 seconds each, 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 55 degrees on 28 August 2017. The field of view is 34' x 23' and follows the CFHT convention, Ha-OIII-SII mapped to RGB.The second and third images comprise 6 x Luminance (300 seconds each), 0.101m f/5.4 Tele Vue refractor with FLI ML16200 camera at an altitude of 55 degrees on 19 September 2017. The fields of view of the images are 132’ x 132’ (2.2 degrees square) and 42' x 42' respectively.
Hills Observatory: 1 January 2013 to 19 January 2019