The lenticular galaxy NGC 3945 in the constellation Ursa Major on March 27, 2017.
The galaxy is intermediate between an elliptical and a spiral galaxy and was discovered
by the British-German astronomer William Herschel in 1790 (source: Wikipedia).
Forty-three exposures of approximately 3 minutes at ISO 800 were stacked with no dark frame
subtraction with Deep Sky Stacker (resulting in a 2 h 24 min exposure) and further processed in Photoshop. This galaxy would need far
more exposure time to reveal more of its beautiful ring structure. Sky transparency was mediocre.
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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).
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