Comet ISON shaping up to be a spectacular display

phys.org ^ | January 15, 2013 | by Bob Yirka

[BenLurkin]

Excitement is mounting for astronomers and star gazers the world over as word spreads that Comet ISON may go down in the history books as one of the flashiest ever. First discovered in September of last year by Russian astronomers, Vitali Nevski and Artyom Novichonok, Comet ISON (C/2012 S1) has been drawing attention ever since.

Of course, projecting the brilliance of a comet or its tail length is an iffy proposition to be sure. It could just break apart when it nears the sun (it's expected to come as close as 32,000 miles), leaving us here on Earth less than impressed with the results, (see Comet Kohoutek - 1973.) More optimistically, because of its size and orientation, it might just present us with the brightest comet show ever seen.

Right now Comet ISON is in Jupiter's orbit, hurtling towards a rendezvous with the sun. As it approaches, bits of it will be vaporized, leading to the creation of a tail. Once it arrives, it will whip around the sun at approximately 425,000 mph and then head back into space passing our planet on its way, allowing us to see it in all its finery.

The best viewing time for the comet is expected to be early in the morning before the sun comes up, as it approaches, and then at both pre-dawn and just after the sun sets as the comet is leaving. When it's approaching, its tail will follow behind it, but as it's leaving, due to solar wind, it will be following its own tail. Estimates on Comet ISON's brightness vary – some suggest it might be equal in luminescence to the planet Mars, while others hint that it might be as bright as the moon, which means it would be visible even during daylight hours.

[SunkenCiv]

;’)

[norwaypinesavage]

Interesting. Note, though, that the universetoday article says that Enckes perihelion is .332 AU. This would place it about 29 MILLION miles from the sun’s surface. The article says that ISON might come 30 THOUSAND miles from the surface.