The Trifid Nebula
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M20 The Trifid Nebula |
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(Click on image for Full Resolution)
(Click here for last my 2001 version with my Vixen 102mm Flourite and ST-237a)
| Date: | August 19, 2003 |
| Exposure: | HaRRGB : 6 x 1200 Ha, 3 x 300s R,G, 8 x 300s B |
| Processing: | Captured with CCDSoftV5, MaxIm for Image calibration,(16 HA,R,G,B flats dark subtracted and Sigma Reject combined, 40 bias frames Sigma Reject combined, 20-1800s darks Sigma Reject combined), dead/hot pixel removal, alignment, normalization. Photoshop for final HaR, HARGB combine, levels and curves adjust and conversion to jpg for website. |
| Conditions: | Good, skies were clear and transparency was better than usual. |
| Scope: | AP155EDF, f/7 (1.671 arcsec/pix measured with TheSky), Vixen 102mm Flourite @ f/9 for Guiding. All equipment on a Paramount ME and can be seen here. |
| Camera: | SBIG ST-8XE, -20°, SBIG ST-237A for Guiding |
| Comments: | Added the H-Alpha for the luminance layer to try and get the extra detail it contains. Still working on gradients produced by the light pollution that continues to get worse. |