The Details |
|
Object |
NGC 6357 in Scorpius |
Optics |
Astro-Physics 160 EDF @ f/5.7 |
Platform |
Astro-Physics 1200 GTO |
Camera |
SBIG STL-11000M |
Filters |
Tru-Balance 6nm Hydrogen Alpha filter |
Date |
20 July 2006 |
Location |
Mount Wilson Observatory - Mount Wilson, CA |
Exposure |
Ha 9 x 1800 sec, 1x1 bin |
Software |
Maxim DL/CCD, Registar, Photoshop CS |
| Orientation | Field of View: 02°11’ x 01°27’ centered on RA 17h24m45s DEC -34 °08’09” (2000.0) . North angle 355.3 °; east 90° CCW from north. |
| Notes | NGC 6357 is a very large, faint emission nebula located in the "stinger" area of the constellation Scorpius. Because it never gets very high above the horizon in the continental US it's a fairly tough object for American astro-imagers. One of my favorite H-alpha targets, NGC 6357 was discovered by John Herschel in 1837 from the Cape of Good Hope, Africa. Lying approximately in the plane of the Milky Way galaxy some 5500 light years from Earth, light from this object is significantly extincted in the blue wavelengths because of the vast amount of intervening galactic dust between us and it. Its stellar nursery of bright blue O-type stars is therefore substantially muted in all but the red wavelengths, with the overall nebula taking on a deep ruddy hue in color images. |
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