Messier 42 and 43 (North Up, East Left)
Messier 42, also known as NGC 1976 or the “Great Orion Nebula”, is an emission nebula in the constellation of Orion. It lies at a distance of ~1,500 light-years and has a diameter of ~30 light years.  M43 is separated from M42, to the north, but is part of the same complex.  It has a diameter of ~8 light-years. The top and middle images comprises 10 x Ha, OIII and SII, all 25 seconds each with 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 55 degrees on 14 December 2015. The fields of view of the images at the top and middle are 34’ x 23’.  The top image follows the HST convention, with cloours mapped as follows: SII-Ha-OIII mapped to RGB.  The middle image shows the same frames presented using the CFHT convention, Ha-OIII-SII mapped to RGB. The bottom image comprises 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 28 December 2016. The field of view of the image is 132’ x 132’ (2.2 degrees square).
Hills Observatory: 1 January 2013 to 6 May 2018