Dates:Aug. 7, 2016 , Aug. 26, 2016 , Aug. 27, 2016 , Sept. 7, 2016
Frames:
Baader Planetarium Blue 1.25": 45x60" -10C bin 1x1
Baader Planetarium Green 1.25": 69x60" -10C bin 1x1
Hutech IDAS 2" LPS P2: 57x240" -10C bin 1x1
Hutech IDAS 2" LPS P2: 40x240" -14C bin 1x1
Baader Planetarium Luminance 1.25": 58x240" -15C bin 1x1
Baader Planetarium Red 1.25": 99x60" -10C bin 1x1
Integration: 13.9 hours
Flats: ~38
Bias: ~100
Avg. Moon age: 14.57 days
Avg. Moon phase: 28.07%
Bortle Dark-Sky Scale: 4.00
Astrometry.net job: 1261362
RA center: 22h 37' 4"
DEC center: +34° 25' 8"
Pixel scale: 1.105 arcsec/pixel
Orientation: -45.898 degrees
Field radius: 0.979 degrees
Resolution: 620x478
NGC 7331 , a magnificent spiral galaxy at ~50MLy distance. It's the biggest of a bunch of galaxies in the whole FoV. The FoV includes the famous Stephen's Quintet of which 3 interacting galaxies are at a distance of 300MLy.
The diameter of NGC 7331 lies around 130.000 Ly. Some people claim it is the sister galaxy of our Milky Way, but it looks more like Andromeda. The galaxy is moving at 816 km/s from us.
In the centrum, it has a circumnuclear, decoupled and fast rotating gaseous disc. The disc is 200pc in size, very metal rich and 2 billion years old. The last supernova in NGC 7331 was detected in 2014
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The image is drizzled. Waiting for RGB data.
4 minutes long exposures seems little bit too much for f2. Stars and the galaxy core are saturated
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Rev C
Added some LUM and RGB. B and G were slightly out of focus. I need to learn how to control the star size.
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