21p 20180813 212445 ndj

image of 21P, taken last night from Chelmsford, UK. The comet continues to brighten. I now have a total mag of 8.4 (UCAC-4 R) in a photometric aperture of diameter 8 arcmin. The structure near the coma shown with a rotational gradient is very stable.

Page last updated: Sat 13 Jul 10:20:33 BST 2019