Object: Constellation: Coordinates: Size: Brightness:
M 83
(= NGC 5236)
Hya 13h37m / -2952' 12.9' x 11.5' 7.5mag

The barred spiral galaxy Messier 83 (Southern Pinwheel Galaxy, NGC 5236) in the constellation Hydra on April 19 / 20, 2015. The galaxy is approximately 15 million light years from Earth and was discovered by Nicolas Louis de Lacaille at the Cape of Good Hope (South Africa) in 1752.

Fourty-one 3 minute exposures at ISO 800 with no dark frame subtraction were stacked with Deep Sky Stacker (resulting in a 2 h 10 min exposure) and further processed in Photoshop. The low position in the sky (declination -30, observing latitude 47 08' North, Switzerland) was a real challenge (maximum height above horizon: 13).
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 83. Map © 2015 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified. The map can be downloaded here .