Messier 13 (M13), also known as NGC 6205 and often referred to as the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster, is a globular cluster containing several hundred thousand stars located in the constellation Hercules.  The images below were taken on the 20th of May 2024.  Due to the cloud only 60 x 10 sec subs about 10 mins @2246, with moon at around 85%.

Object: M13

Location: Portsmouth, UK

Mount: Alt Az

Bortle Scale: 7

Total Session Time: 10 Minutes

Nights:       20th May 2024

Total Subs Used: 60 x 10 Subs

Seeing:  Moon at around 85%.

Fits Stacked: Siril  Script Seestar Preprocessing.

Post-Processing Steps

1. GraXpert - Background extraction and Denoise v2.0 

2. Siril - colour calibration, photometric colour calibration, removing green noise, colour calibration, histogram stretch