The Cone Nebula is an H II region in the constellation of Monoceros. The nebula is located about 2,700 light-years away from Earth. The diffuse Cone Nebula, so named because of its apparent shape, lies in the southern part of NGC 2264, the northern part being the magnitude-3.9 Christmas Tree Cluster. The cone's shape comes from a dark absorption nebula consisting of cold molecular hydrogen and dust in front of a faint emission nebula containing hydrogen ionized by S Monocerotis, the brightest star of NGC 2264. The faint nebula is approximately seven light-years long with an apparent length of 10 arc-minutes.
Ha-RGB (400-80-80-80 min) total 10,7 h, seeing 0.8-1.2 arc-sec, north is up
80cm f/7 Astrooptik Keller corrected cassegrain, FLI PL-16803, Baader Filters, Prompt 7 CTIO Chile
Processing: Johannes Schedler
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