Antilhue - Chile

NGC 6357
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Image Data

Designation NGC 6357 and "Las cuatro Juanitas"
Constellation Scorpius (Sco)
Description A perfect line-up of four 7th magnitude stars point towards the heart of this faint emission nebula. It is a difficult visual object because of its very low surface brightness and large extension: about the size of two full moons. Just like neighbouring NGC 6334, it is heavily obscured by galactic dust: 10 magnitudes of extinction in the green and much more in the blue. The B&W version in narrowband H-Alpha light is here.
Exposure HaRGB 180:36:30:48 min @ -18C, 1x1
Camera SBIG ST-10XE selfguided,  CFW-8,   Custom Scientific 4.5 nm Ha + RGB filters
Optics Astro-Physics Traveler AP105EDF with 0.75x focal reducer @ f/4.6 (483mm focal length)
Mount Astro-Physics AP1200GTO German Equatorial Mount
Software MaxIm DL/CCD, Sigma Beta 10, DeBloomer, Registar, Adobe Photoshop 6.0
Location - Date - Time San Esteban (Chile) - 22Jun2003 - 04:00 UTC
Conditions Transparency 6,  Seeing 6, Temperature +12C