Messier 5 is considered by many observers to be one of the finest globular clusters in the sky. While barely visible as a naked eye object under extremely dark skies and as a dim patch in binoculars, Messier 5 becomes a spectacular sight observed with a telescope.
Globular clusters are giant aggregations of many stars in close gravitational association. They are spherical in shape and contain 100,000 to 1,000,000 individual stars. They also orbit in a halo around our Milky Way Galaxy [and other galaxies as well], the source of their origin is not yet fully understood. There are more than 150 known globular clusters in our own Milky Way galaxy.
Messier 5 is one of the largest of the Milky Way globular clusters. It is believed to be approximately 165 light years across. Astronomers believe that it contains 100,000 to 500,000 individual stars. It is one of the oldest known globular clusters and estimated to be about 13 billion years old. The distance to Messier 5 is believed to be about 24,000 light years from Earth.
Camera and Telescope: ZWO ASI1600MM-C with Baader 36mm filters attached to a Stellarvue SVQ100 at 580mm focal length.
Exposure times: luminance – 25 x 90 seconds, RG&B – 10 x 240 seconds for each channel.
Date: April 17, 2018 at Tierra del Sol, San Diego County, California.
Click on the images below to see larger versions. Go to my Astrobin page to see a 2328 x 1760 pixel enlargement.