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M-20 The Trifid Nebula is a star forming region with an interesting mix of Emission Nebula (red) and Reflection Nebula (blue). Both of these types of Nebula represent different stages in the star forming process, Reflection Nebula being the later stage. It's name was originally derived from the three dark lanes that roughly divide it into 3 sections. It lies about 1 1/2 degrees north of the The Lagoon Nebula in the constellation Sagittarius about 5,200 Light Years from Earth. Another example of a nebula which contains Reflection and Emission component is IC405.
Additional Photographic Notes: This object is low on the southern horizon from my latitude of 43 degrees N in Michigan. Exposures at this low altitude have to be limited to 45 minutes to 1 hr maximum. After 1hr the background becomes saturated to the sky fog limit. To bring out the proper detail in this photograph, I will have to expose one or two more negatives at 1 hr in the summer of 2002 and stack them digitally. |
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