This week, you have a once-in-a-430 year chance to see a new comet. Comet Nishimura was just discovered last month, and will be gone by the end of the week.
Nishimura green comet: what is it, how to see it and when it will be back – NPR
Scientists determined that this comet takes about 430 years to orbit the sun.
So the last time it was visible from Earth was in the late 1500s — before Galileo Galilei pointed his telescope to the sky.
The last time this comet came through these parts was just a few years before Galileo invented his telescope. The comet was discovered just last month, by an amateur astronomer named Hideo Nishimura.
There are good images of the comet as well as detailed location information here: The new comet Nishimura is closest to Earth today.
I should have posted this a few days ago, because the comet is now passing us. If you’re interested, the comet is visible this week with binoculars or a telescope, but only with effort and only from the northern hemisphere. Try looking toward the east, low on the horizon, before sunrise, and look for the constellation Leo.
I don’t have good binoculars or a telescope, but that’s fine. It’s enough for me to know that this comet, and so many other fascinating objects, are still out there.
Waiting to be discovered.
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J.R. Johnson 
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