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This picture is a 300 seconds exposure through filter H2O+. It was taken by Alan Fitzsimmons while observing on La Palma. Four ion filaments are visible. |
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This picture is the sum of three 120s and two 300s exposures using the filter centered at 618 nanometers. They were taken from 21:09 to 21:30 UT. Field size is 10.2×10.3 degrees. The dot to the left of the comet head is a star. |