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Fig. 1


Coma structures found at different dates from R-band data with image-enhancing techniques. First, second, third, and fourth column shows an isophotal representation of the corresponding original image, Larson-Sekanina and adaptive Laplace filtering results, and a large field of view Larson-Sekanina frame to show the curvature of the sunward dust activity at long nucleocentric distances, respectively. The Laplace filter width used was 15 px on 2010 February 9 and 23 px on all other dates. All images are oriented north-up, east-left. Arrows pointing S give the position of the Sun in the frames. The horizontal bar in the upper right corners corresponds to a scale length of 10 000 km.

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