|Object name:||Constellation:||Coordinates:||Apparent size:||Visual brightness:|
|Messier 109 (NGC 3992)||Ursa Major||11h58m / +53°22'||7.5' x 4.4'||9.8 mag|
The barred spiral galaxy Messier 109 (also known as NGC 3992) in the constellation Ursa Major. Messier 109 is around 84 million light-years from Earth and exhibits a weak inner ring structure around the central bar. The galaxy was discovered by Pierre Méchain in 1781. (source: Wikipedia).
Forty-five 3-minute exposures (135 minutes total exposure) at ISO 800 taken on March 15, 2020 were added for this shot with the DeepSkyStacker software and the final image processing was done 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).