46P/Wirtanen is a short-periodic comet with an orbital period of 5.4 years. It was discovered by Carl A. Wirtanen in 1948 at the Lick Observatory. It belongs to the Jupiter family of comets, all of which have aphelia between 5 and 6 AU. Its diameter is estimated to be 1.2 kilometres. 46P/Wirtanen was the original target for the Rosetta spacecraft, but an inability to meet the launch window led to Rosetta being sent to 67P/Churyumov–Gerasimenko instead. This image was taken on December 27th 2018. Below is an image with tracking on the comet's nuclei: