Comet C/2016 R2 from last night. Now the coma (greenish) is clearly differentiated from the CO and CN parts of the tail, which impress blue to deep blue (380nm). In some published pictures of other authors the coma is shown in blue, which is probably due to image processing errors. Imaging technique: Hyperstar C14 with ASI 1600 monochrome (-35°C) and blue filter RASA 11" with ATIK 490 color (-25°C) 30 subframes of 120 sec exposure time each. Tenerife, 1180 m above sea level, 2018-01-10 |
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