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The Details
M 83 The Southern Pinwheel in Hydra
Astro-Physics 12" Mak-Cass at f/8
Astro-Physics 1600 GTO Mount with absolute encoders
FLI 16803 Proline CCD
Tru-Balance LRGB filter set - Gen 2
Various dates in February/March/April 2015
Las Campanas Observatory, Chile
L 50 x 600 sec 1x1 bin; RGB 18 x 600 sec, 1x1 bin
Maxim DL/CCD, CCDStack 2, Photoshop CS5
Field of View: 32' x 21' centered on RA13h36m58.5s
DEC -29°51’50” (2000.0) . North angle 179.61 °; east 90° CCW from north
The Southern Pinwheel is a magnificent face-on barred spiral galaxy in the constellation Hydra. It lies about 15 million light years from Earth and forms a small group with its equally famous partner, Centaurus A or NGC 5128. This object was discovered by Nicholas Louise de Lacaille at the Cape of Good Hope, Africa on February 23, 1752. Charles Messier observed and cataloged it nearly 30 years later from his Paris Observatory, an outstanding feat considering his northerly location and relatively primitive equipment.

In his classic book Galaxies, the American astronomer Harlow Shapley wrote that M 83's dynamic appearance was "spectacular evidence that the universe is not static."

Total exposure time was 17 hours 20 minutes. This image is the result of a collaborative effort between Howard Hedlund of Astro-Physics, Inc. and Dave Jurasevich.




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