The Dark Tower, SFO 82, RCW113, vdBH73a-e, B44a, HMSTG895, NGC 6231(partial); Scorpius
Astro-Physics 155 EDF (155TCC) f/5.4 refractor
KAF-16803 FLI Proline
Total Exposure Time: 6.5 hours HOO:RGB 200:120:120:24:24:24 minutes. RGB used for stars colors and reflection nebulae.
June 2010; RDO, Moorook, AU
Comments: The Dark Tower is an obscure dark object in Scorpius that has been described as a cometary globule. NASA APOD featured this object in 2008: "In silhouette against a crowded star field toward the constellation Scorpius, this dusty cosmic cloud evokes for some the image of an ominous dark tower. In fact, clumps of dust and molecular gas collapsing to form stars may well lurk within the dark nebula, a structure that spans almost 40 light-years across... Known as a cometary globule, the swept-back cloud... is shaped by intense ultraviolet radiation from the OB association of very hot stars in NGC 6231... That energetic ultraviolet light also powers the globule's bordering reddish glow of hydrogen gas. Hot stars embedded in the dust can be seen as small bluish reflection nebulae. This dark tower, NGC 6231, and associated nebulae are about 5,000 light-years away". (Ref) This image is comprised of hydrogen-alpha and oxygen-III filtered data, with RGB data for the stars and reflection nebulae. A portion of the open star cluster NGC 6231 is in the upper right of the image. Numerous hydrogen clouds exists in the region.