The fascinating edge-on spiral galaxy NGC 891 in the constellation Andromeda
on October 26 / 27, 2014. A dark lane can be seen across the whole length of the galaxy. NGC 891 is approximately 30 million light-years
from Earth, measures 100'000 light-years in diameter and was discovered by William Herschel in 1784 (source: Wikipedia).
Forty-five 3 minute exposures at ISO 800 with no dark frame subtraction were stacked with Deep Sky Stacker (resulting in a 2 h 15 min exposure)
and further processed in Photoshop. For the background, only twenty-three 3 minute exposures were used (amounting to 1 h 19 min exposure time).
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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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