M4 Star Cluster in Rho Ophiuchi

M4 Star cluster in Rho Ophiuchi Region

M4 Star Cluster in Rho Ophiuchi

M4 Globular star cluster

located in the constellation of Scorpius. At a distance of approximately 7,200 light-years, M4 is relatively close by cosmic standards. With a diameter of around 75 light-years, it contains thousands of tightly packed stars that have gravitationally bound together. These stars are believed to be some of the oldest in our galaxy, estimated to be around 12.2 billion years old. Another great example of the beautiful Rho Ophiuchi region.

I photographed this in July 2021 using my F2.2 Hyperstar and a cooled CMOS colour camera

Image camera : QHY 294c

Guide camera : ZWO ASI 120MC

Telescope : Celestron Edge HD 9.25

Guide scope : Sky-Watcher Evoguide 50 ED

Focal length / ratio : 525mm F2.2

Filters : UV-IR Filter

Exposure time : 4.5hrs

Mount : Sky-Watcher EQ6-R Pro

Location : Turondale, NSW, Australia

Date : July 2021