Hubble’s view of Comet ISON (C/2012 S1) on April 10, 2013. This image was taken in visible light. The blue false color was added to bring out details in the comet structure. Credit:NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team
NASA’s Hubble Telescope took an amazing shot of Comet ISON in April that shows its coma against the velvety backdrop of space. The coma is already approximately 3,100 miles across (approx: 4,988.97 km). The really mind boggling thing about this is that early measurements indicate that the nucleus that is producing this enormous coma is no more than 3 or 4 miles across (4.828 to 6.437 km).
There is some speculation that it could get as bright as the full moon come late November, early December after it skims a bare 700,000 miles (1,126,540.8 km) above the surface of the sun on November 28th during the swing around before heading back out of the solar system.
For more information and to keep track look to NASA’s website.