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Comet ISON in 2013

Comet ISON could become one of the brightest comets ever seen. In late November,
when it makes its closest pass by the sun, it may shine as brightly as the full moon. That alone can make the comet ISON pass the astronomy event of the century.

The Hubble telescope captured the new photos of the comet on April 10, when Comet ISON was slightly closer than Jupiter. At the time the icy comet (with a nucleus of 4.8 - 6.5 km across was about 621 million kilometers from the Sun and 634 million km from Earth. Despite the small size of the comet, its coma is about 5000 km wide and its tail is more than 92,000 km long.

Comet ISON for 2013 expected to be brightest comet

CREDIT: NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team

Source: Space.com article about Comet ISON