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Philip Good's Astro Photos
Deep Space Astrophotography
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NGC6888 - The Crescent Nebula in Ha and OIII
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*** Anacortes Astronomy Picture of the Day, 6/20/2007 ***
Other ATWB Picture of the Day Winners
ATWB Photo of the Day
The Crescent Nebula (NGC 6888 or Caldwell 27) is an emission nebula in the Cygnus constellation, about 5000 light years away. It is formed by the fast stellar wind from the Wolf-Rayet star HD 192163 (or WR 136) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray emitting temperatures. (wikipedia.org)
NGC 6888's central star is shedding its outer envelope in a strong stellar wind, ejecting the equivalent of our Sun's mass every 10,000 years. Near the end of its stellar life, this star should ultimately go out with a bang in a spectacular supernova explosion.
This image is a combination of Ha and OIII filtered images, where Ha = Red, OIII = Blue and Green is a combination of the Ha and OIII images.
Contact me for a framed print of this image: pgood@infiniti-eng.com
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| Rate this file (current rating : 4.7 / 5 with 18 votes) |
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| File information |
| Filename: | NGC6888-Ha-OIII.jpg |
| Album name: | goodp / Nebulas |
| Rating (18 votes): | |
| Keywords: | Nebula Hydrogen SV115 Ha OIII |
| Telescope/Mount: | Stellarvue SV115: 115mm f7 at f5.6 with Televue 0.8 Reducer. Mountain Instruments MI-250 mount. |
| CCD: | SBIG ST2000XM with Astrodon Ha and OIII filters. |
| Image Details and Processing: | 6-1/2 Hours Ha (Red) and 12 Hours of OIII (Blue) in 30 minute subframes. Captured with CCDSoft and CCD Commander, combined with CCDStack, processed in Photoshop. |
| Date and Location: | Denver, CO. May 30 - June 9, 2007 |
| File Size: | 2390 KB |
| Date added: | Jun 09, 2007 |
| Dimensions: | 1560 x 1170 pixels |
| Displayed: | 474 times |
| URL: | http://infiniti-eng.com/astrophotos/displayimage.php?pos=-60 |
| Favorites: | Add to Favorites |
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