Winter Green Comet with Orion
The very green Comet Wirtanen (at far upper right) to the west of the rising Orion the Hunter (at far left), over a snowy winter scene. This was December 6, 2018 with the comet in Eridanus and heading north into Taurus. It was a very clear night but crisp at -15° C. But it was a dry cold!
The characteristic green colour of comets comes from glowing cyanogen and diatomic carbon molecules. The comet was easy in 45mm binoculars and was barely naked eye if you knew exactly where to look and used averted imagination!
This is a wide view with the 35mm lens Canon lens on the Canon 6D MkII, at f/2.8 and is a stack of 3 x 1-minute exposures for the sky, tracked on the Star Adventurer Mini, blended with a stack of 3 x 1-minute exposures for the ground, untracked to preserve details. However, the blurring of the trees from the tracked images is tough to mask out without introducing back the trailed stars. So I have left it in as a soft background and drop-shadow effect.