Imaging telescope or lens: Orion EON 130mm ED Triplet APO
Imaging camera: ZWO ASI1600MM-Cool
Mount: Astro-Physics Mach1GTO
Guiding telescope or lens: Orion 60mm Guidescope
Guiding camera: Orion StarShoot AutoGuider Pro Mono
Focal reducer: Orion 3" Field Flattener
Accessory: ZWO EFW
Dates: June 17, 2017
Integration: 1.6 hours
Avg. Moon age: 22.17 days
Avg. Moon phase: 49.73%
Astrometry.net job: 1618218
RA center: 239.799 degrees
DEC center: 20.758 degrees
Pixel scale: 0.425 arcsec/pixel
Orientation: 118.446 degrees
Field radius: 0.252 degrees
Locations: Home, Onalaska, Texas, United States
Seyfert's Sextet is the densest known galaxy cluster. The galaxies are seen in the center of this image about 190 million light-years away, in the constellation Serpens, in the rough shape of a capital "A". As the name implies, the group appears to contain 6 galaxies, but actually there are "only" 4 interacting galaxies. The circular face-on galaxy at lower center is in the background and appears aligned with the main group only by chance. Also, the prominent fuzzy object at lower left is not a separate galaxy at all, but a tidal tail of stars flung out by the galaxies' gravitational interactions. The gravitational interaction among these galaxies should continue and ultimately the galaxies will likely merge to form a single giant elliptical galaxy. Overall, the entire galaxy cluster take up less volume than our galaxy.
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