|The unbarred spiral galaxy NGC 7331 in the constellation Pegasus on August 4, 2016 and on August 8, 2016.
The galaxy is about 40-50 million light-years from Earth and was discovered by the British-German astronomer William Herschel in 1784. More galaxies can be
seen above and around NGC 7331. The galaxies directly above NGC 7331 are NGC 7340, NGC 7337, NGC 7335, NGC 7336 (for more details see image below). They are
300-400 million light-years from earth (source: Wikipedia).
Fourty-six exposures of approximately 3 minutes at ISO 800 were stacked with no dark frame
subtraction with Deep Sky Stacker (resulting in a 2 h 31 min exposure) and further processed 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).