Herschel 173 and Caldwell 21 (North Up, East Left)
Herschel 173, also known as NGC 4449 and Caldwell 21, is an irregular galaxy in the constellation of Canes Venatici with a diameter of ~20,600 light-years. This image comprises 10 x Luminance (60 seconds each) and 5 x Red, Green and Blue (60, 61 and 48 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 65 degrees on 17 February 2017. The fields of view of the images at the top and bottom are 34’ x 23’ and 18’ x 12’ respectively.
Hills Observatory: 1 January 2013 to 14 August 2018
COMETS COMETS
DEEP SKY DEEP SKY