Rare Green Comet Nishimura: Your Last Chance to See It Before It Disappears for 400 Years

A newly-discovered green comet named Nishimura, after amateur Japanese astronomer Hideo Nishimura who discovered it, is currently visible from the northern hemisphere for the first time in over 400 years. The comet can be seen in the constellation of Leo and appears as a fuzzy white glow to the naked eye, but photographs show a bright lime green color. To spot the comet, observers will need binoculars or a small telescope and should consult star charts from Sky & Telescope for guidance. The comet will be closest to Earth on September 17 before becoming visible from the southern hemisphere.