Post
by KuriousGeorge » Thu Aug 16, 2018 1:45 pm
Stephan's Quintet. KG Observatory.
From August 5th through August 15th we were very fortunate to experience extremely steady, clear and dark skies in Julian, CA. This is the first of 6 objects I captured during this time.
"Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered.The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. The group is the most studied of all the compact galaxy groups.The brightest member of the visual grouping is NGC 7320 that is shown to have extensive H II regions, identified as red blobs, where active star formation is occurring.
NGC 7320 indicates a small redshift (790 km/s) while the other four exhibit large redshifts (near 6600 km/s). Since galactic redshift is proportional to distance, NGC 7320 is only a foreground projection and is ~39 million ly from Earth versus the 210-340 million ly of the other five."
Imaging telescope or lens:Planewave CDK24
Imaging camera:FLI Proline 16803
Mount:Planewave L600
Guiding camera:Starlight Xpress Ultrastar
Focal reducer:None
Software:Planewave PWI4, Planewave PWI3, PixInsight 1.8, Maxim DL6, PHD Guiding 2, Neat Image V7, Photoshop CS3, Sequence Generator Pro
Filters:Astrodon 50mm R, Astrodon 50mm B, Astrodon 50 mm G, Astrodon 50mm L
Accessories:FLI CFW-5-7, Astrodon Monster MOAG, Hedrick Focuser, Planewave Delta-T, Planewave EFA
Resolution: 1134x1019
Dates: Aug. 5, 2018, Aug. 6, 2018, Aug. 7, 2018
Frames:
Astrodon 50 mm G: 8x900" -20C bin 1x1
Astrodon 50mm B: 8x900" -20C bin 1x1
Astrodon 50mm L: 24x900" -20C bin 1x1
Astrodon 50mm R: 8x900" -20C bin 1x1
Integration: 12.0 hours
Darks: ~20
Flats: ~80
Flat darks: ~80
Bias: ~20
Avg. Moon age: 23.96 days
Avg. Moon phase: 31.55%
Mean SQM: 21.60
Astrometry.net job: 2202005
RA center: 339.009 degrees
DEC center: 33.965 degrees
Pixel scale: 0.468 arcsec/pixel
Orientation: 179.167 degrees
Field radius: 0.099 degrees
Locations: KG Observatory, Julian, CA, United States
Data source: Backyard
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