Messier 4 (North Up, East Left)
Messier 4, also known as NGC 6121, is a globular cluster in the constellation of Scorpius. It lies at a distance of ~10,000 light-years and has a diameter of ~100 light-years. In the third image, the globular cluster to the north-east of Messier 4 is NGC 6144 and the nebula to the east surrounds magnitude 1 Antares, which is a red supergiant about 850 times the diameter of our Sun. The first and second images comprise 10 x Luminance (60 seconds each) and 4 x Red, Green and Blue (60, 63 and 54 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 30 degrees on 14 March 2016. The fields of view are 35’ x 23’ and 18’ x 12’ respectively. The third and fourth images comprise 6 x Luminance (300 seconds each), 0.101m f/5.4 Tele Vue refractor with FLI ML16200 camera at an altitude of 35 degrees on 21 July 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 26 May 2020