Messier 21 (North Up, East Left)
Messier 21, also known as NGC 6531, is an open cluster contaiing ~70 stars in the constellation of Sagittarius.  It has a diameter of ~15 light-yeards, lies at a distance of ~4,300 light-years and is ~4.6 million years old. This image comprises 10 x Luminance (30 seconds each) and 5 x Red, Green and Blue (30, 30 and 24 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 50 degrees on 31 October 2017. The fields of view are 34’ x 23’ and 18' x 12', respectively.
Hills Observatory: 1 January 2013 to 13 August 2019
COMETS COMETS
DEEP SKY DEEP SKY