Object: Constellation: Coordinates: Size: Brightness:
Messier 3
(= NGC 5272)
CVn 13h42m / +2823' 18' 6.2mag

The globular cluster Messier 3 (NGC 5272) in the constellation Canes Venatici on April 29 / 30, 2016. Messier 3 is 34'000 light-years from Earth, contains around 500'000 stars and was discovered by Charles Messier in 1764 (source: Wikipedia).

Nineteen exposures of approximately 3 minutes and five exposures of approximately 1 minute at ISO 800 were combined with no dark frame subtraction with Deep Sky Stacker (resulting in a 1 h 12 min exposure) and further processed in Photoshop.
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 3. Map © 2016 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified. The map can be downloaded here .