Object: Constellation: Coordinates: Size: Brightness:
Messier 5
(NGC 5904)
Ser 15h19m / +0205' 23' 5.6mag

The globular cluster Messier 5 (NGC 5904) in the constellation Serpens, photographed on April 20 / 21, 2018. Messier 5 is approximately 24'500 light-years from Earth, contains approximately 100'000 stars and was discovered by Gottfried and Maria Kirch 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 one of the oldest globular clusters in the Milky Way Galaxy (source: Wikipedia).

Twenty-two exposures of 3 minutes at ISO 800 were stacked with no dark frame subtraction with Deep Sky Stacker (resulting in a 1 h 6 min exposure) and further processed in Photoshop. A few frames with a shorter exposure time are still needed to improve the overexposed center of the globular cluster.
Equipment: Canon EOS 450D Baader modified 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 (field of view comparison: image of the moon with the same equipment).

Search chart for Messier 5. Map © 2018 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified. The Mag-7 Star Atlas Project map can be downloaded here .
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