M13 Globular Cluster in Hercules

The entire wide-field image is 2.5 x 2.5 degrees, which corresponds to five full moons in width and height.

Twenty-five thousand light-years distant and 150 light-years in diameter, Messier 13 is one of the brightest globular star clusters in the northern sky. It contains around 300 000 stars. Stars in the cluster's core are spaced less than 0,3 light-years apart.


This photo was taken while the winter sky was flooded with the bright glow of a 98.5 % moon only 86 degrees away at an altitude of thirty degrees.


Date: 12 Feb 2017

Loc: Rennesøy, Norway

Telescope: Esprit 120 ED 840 mm f/7

Camera: Apogee Alta U16M

Mount: ASA DDM160

Exposure: LRGB 20/20/20/20 min

CCD-temperature -30 C

Processing: Maxim DL 6