Caldwell 57: Amateur Image vs. Hubble Image
Caldwell 57 (C57) is a dwarf irregular galaxy located some two million light-years away in the constellation Sagittarius. It is also called Barnard’s galaxy after the American astronomer credited with first discovering it. The dark line in the Hubble image is a “chip gap”. It is an area between the detectors where no data was collected. The left image was taken with an 8-inch Schmidt-Cassegrain telescope using a 0.63x focal reducer and a DSLR Camera. The right image was taken by NASA’s Hubble Space Telescope.
Image Credit: Amateur Image: Photographed by and used with permission of K. Hartnett; Hubble Image: NASA, ESA, and J. Cannon (Macalester College); Processing: Gladys Kober (NASA/Catholic University of America)
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https://science.nasa.gov/image-detail/amf-845720a9-f2f0-4687-b065-80ce12818dec/
Image CreditAmateur Image: Photographed by and used with permission of K. Hartnett; Hubble Image: NASA, ESA, and J. Cannon (Macalester College); Processing: Gladys Kober (NASA/Catholic University of America)
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