CN coma morphology of 41P on March 31, 2017 (before perihelion). Each image is centred on the nucleus, and has been enhanced by a simple rotational filter. The date (in UT) is indicated at the top of each frame. In all images north is down and east to the left with the direction of the Sun indicated in the bottom right frame. The field of view of each image is 8.5′ × 9.8′, which covers53 120 × 26 520 km.