Composite image of Comet Leonard streaming across the sky taken by the European Space Agency's Near-Earth Object Coordination Centre, using the Calar Alto Schmidt telescope. Background stars are seen as green, red and blue streaks due to three artificial filters used to observe Leonard. These artificial colours create the white glow around the comet's nucleus (lower left). Composite image made of 90 superimposed images each 5 seconds long taken on the 7th of December 2021.