Messier 5 (Serpens)

Object image
Fig.1 - Rich in RR Lyrae variable stars: Messier 5 (NGC 5904) in Serpens, photographed with a 16-inch f/4.5 Dob on an equatorial platform.
Object name: Constellation: Coordinates: Apparent size: Visual brightness:
Messier 5 (NGC 5904) Serpens 15h19m / +02°05' 23' 5.6 mag

The globular cluster Messier 5 (NGC 5904) in the constellation Serpens. Messier 5 is approximately 24,500 light-years from Earth, contains at least 100,000 stars and was discovered by German astronomer Gottfried Kirch and his wife Maria in 1702. Spanning 165 light-years in diameter, Messier 5 is one of the largest known globular clusters. With an age of 13 billion years, Messier 5 is also one of the oldest globular clusters in the Milky Way Galaxy (source: Wikipedia).

Twenty-three 3-minute exposures (69 minutes total exposure) at gain 100, taken on May 21 / 22, 2022, were added for this shot with Astro Pixel Processor (APP) software and the final image processing was done in Photoshop. Darks, flats, darkflats and bias frames were used.

Equipment: Cooled ASI 2600MC Pro camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system.

Search chart
Fig.2 - Search chart for Messier 5. Map © 2022 "The Mag-7 Star Atlas Project", www.siaris.net. Map is slightly modified. The map can be downloaded here.