Technical details: Location / Date: Outside of Kopparberg, Västmanland, Sweden / 2016-December Optics: Orion Optics UK AG12 Mount: 10 Micron GM1000 HPS (Unguided) Camera: Canon EOS 100D (Modded with Baader ACF filter) Exposure: 69 x 240 seconds + 27 x 300 seconds all shot on ISO 3200 (cumulative exposure time is 6 hours and 51 minutes) Processing: Pixinsight and Photoshop   Image details: The Cone Nebula is an H II region in the constellation of Monoceros. It was discovered by William Herschel on December 26, 1785. The nebula is located about 830 parsecs or 2,700 light-years away from Earth. The Cone Nebula forms part of the nebulosity surrounding the Christmas Tree Cluster. The designation of NGC 2264 in the New General Catalogue refers to both objects and not the nebula alone. 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. It is in the northern part of Monoceros, just north of the midpoint of a line from Procyon to Betelgeuse. 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 arcminutes), and is 2,700 light-years away from Earth. (Information from Wikipedia)