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I agreeImaging telescope or lens:RC Optical Systems RCOS 10" Ritchey-Chrétien
Imaging camera:SBIG STL-11000M
Mount:AP900GTO Astro Physics
Guiding telescope or lens:RC Optical Systems RCOS 10" Ritchey-Chrétien
Guiding camera:SBIG Remote Guide Head
Filters:Astrondon Astrodon, Baader Planetarium H-a
Accessories:FLI CW2-7 Filter wheel 7, SBIG AO-L, SBIG Remote Guide Head
Resolution: 3418x2279
Dates:Nov. 25, 2019
Frames: 128x900"
Integration: 32.0 hours
Avg. Moon age: 28.30 days
Avg. Moon phase: 1.70%
Astrometry.net job: 3074679
RA center: 13.196 degrees
DEC center: -31.194 degrees
Pixel scale: 0.803 arcsec/pixel
Orientation: 320.060 degrees
Field radius: 0.458 degrees
Data source: Own remote observatory
Remote source: Non-commercial independent facility
This delicate looking galaxy is located in the Sculptor constellation. It is a very large barred spiral, almost 3 times larger than our own Milky Way. The very faint bluish spiral arms are estimated to be 300,000 light-years across.
I performed a slight crop on the image as I wanted to retain the feeling of distance from this beautiful galaxy some +70 million light-years away. At this distance, NGC 289 presents the angular dimensions of 5.10 X 3.6 arcmins, a visual magnitude of 11, with a surface brightness of 14.0 mag/arcmin2. This certainly adds to the challenge as the galaxy core small, and its arms are incredibly dim requiring long exposures to reveal them against the background. I really wanted to capture the faint arms and thought I would try 20 min exposures as an experiment in the Luminance channel. I don’t have a data set of 15 min exposures, so I can’t really tell if there is or would be a difference in the end result.
Instruments:
10 Inch fl 9.1 RCOS
Astro Physics AP-900 Mount
SBIG STL 11000m
FLI Filter Wheel
Astrodon Lum, Red, Green, Blue Filters
Baader Planetarium H-alpha 7nm Narrowband-Filter
Exposure Details:
Lum 41 X 1200
Red 21 X 500
Green 11 X 500
Blue 26 X 500
Ha 21 X 1800
Total Exposure: 32.21
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