Presently appearing as just a tiny dot in the sky beyond Jupiter, the comet was discovered Sept. 21 by Vitali Nevski and Artyom Novichonok of the International Scientific Optical Network in Russia and confirmed Tuesday by the International Astronomical Union's Minor Planet Center in Cambridge, Mass.
Astronomers calculating its near-parabolic orbit say Comet ISON is headed almost straight toward the sun and make its closest approach to it Nov. 28 or 29, 2013, NewScientist.com reported.
The intense heat of that solar fly-by should vaporize the comet's icy surface and release trapped dust that would help it grow an exceptionally bright tail.
It could even be brighter than the full moon around its closest approach to the sun, Astronomy Now magazine said.
The orbit of Comet ISON suggests it is a newcomer fresh from the Oort cloud, a distant ring of icy objects surrounding the solar system, astronomers said.