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Abell 39

Part Number 12
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Abell 39
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Ghostly in appearance, Abell 39 is a remarkably simple, spherical nebula about five light-years across. Well within our own Milky Way galaxy, the cosmic sphere is roughly 7,000 light-years distant toward the constellation Hercules. Abell 39 is a planetary nebula, formed as a once sun-like star's outer atmosphere was expelled over a period of thousands of years. Still visible, the nebula's central star is evolving into a hot white dwarf. Although faint, the nebula's simple geometry has proven to be a boon to astronomers exploring the chemical abundances and life cycles of stars. In this deep image recorded under dark night skies, very distant background galaxies can be found -- some visible right through the nebula itself. (source NASA/APOD) Technical Details: Optics 32-inch Schulman Telescope (RCOS) Camera SBIG STX16803 CCD Camera Filters Astrodon Gen II Dates June 2012 Location Mount Lemmon SkyCenter Exposure LRGB = 390:100:100:100 minutes Acquisition Astronomer Control Panel (ACP), TheSky (Software Bisque), Maxim DL/CCD (Cyanogen), FlatMan XL Processing CCDStack v2 (CCDWare), Photoshop CS5 (Adobe), PixInsight Credit Line & Copyright Adam Block/Mount Lemmon SkyCenter/University of Arizona
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