Object: Constellation: Coordinates: Size: Brightness:
Messier 13
(= NGC 6205)
Her 16h42m / +3628' 20' 5.8mag

The globular cluster Messier 13 in the constellation Hercules on March 8 / 9, 2014. Discovered by the English astronomer Edmond Halley in 1714, this cluster contains an estimated 300'000 stars and is 25'100 light years from Earth. The cluster which measures 145 light years in diameter can be seen in a small telescope (source: Wikipedia).

18 3-minutes exposures, 6 1-minute exposures and 7 15-second exposures at ISO 800 were added separately in DeepSkyStacker and the three resulting stacks were added in Photoshop. The total exposure time was 65 minutes.
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 13. Map © 2014 "The Mag-7 Star Atlas Project", www.siaris.net. Map is slightly modified. The map can be downloaded here .