Green comet in the neighborhood.
Comet 21P/Giacobini-Zinner made its closest approach to Earth in 72 years on September 10th. It will remain visible during September with binoculars or a small telescope.
On September 15th, the green comet, 21P, will cross in front of the star cluster, M35, in the constellation Gemini. It will be a unique and striking view, with the cluster appearing to have sprouted a tail.