46P/Wirtanen is a small short-period comet with a current orbital period of 5.4 years. It was the original target for close investigation by the ESA Rosetta spacecraft. On 16 December 2018 the comet will pass at only 30 lunar distance from Earth, reaching an estimated magnitude of 4.2, and making this pass the brightest one predicted, and the brightest close approach for the next 20 years for a Jupiter Family comet. Both TRAPPIST are monitoring closely since several weeks the activity and the coma composition of the comet.
Composite image made of B, V, R broad band filters images and a special cometary filter to reveal the extended gaseous coma of the C2 molecule (bluish coma). E.Jehin
