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Tuesday, January 07, 2014

Searching for ISON now but..


Jan. 16 May Be Last Best Chance to Search for Comet ISON’s Remains

by BOB KING 
Comet ISON revolves around the sun in steeply inclined orbit. Earth will pass through the plane of that orbit on Jan. 16. As we look "up" toward the comet our edgewise perspective could cause a temporary brightening of ISON's dust remnant. Credit: solarsystemscope.com with annotations by the writer.
Comet ISON revolves around the sun in steeply inclined orbit. Earth will pass through the plane of that orbit on Jan. 16. As we look “up” toward the comet, ISON’s dust stacks up along our line of sight and could appear temporarily brighter. Credit: solarsystemscope.com with annotations and additions by Bob King
Is there any hope of detecting what’s left of Comet ISON after the sun proved too much for its delicate constitution? German amateur astronomer Uwe Pilz suggest there remains a possibility that a photographic search might turn up a vestige of the comet when Earth crosses its orbital plane on January 16, 2014.
On and around that date, we’ll be staring straight across the sheet of debris left in the comet’s path. Whatever bits of dust and grit it left behind will be “visually compressed” and perhaps detectable in time exposure photos using wide-field telescopes. To understand why ISON would appear brighter, consider the bright band of the Milky Way. It stands apart from the helter-skelter scatter of stars for the same reason; when we look in its direction, we peer into the galaxy’s flattened disk where the stars are most concentrated. They stack up to create a brighter band slicing across the sky. Similarly, dust shed by Comet ISON will be “stacked up” from Earth’s perspective on the 16th.
Comet ISON debris simulations for Jan. 12 and 14, 2014. The aqua line points toward the sun; the black line is 1 degree long. Credit: Uwe Pilz
Comet ISON debris simulations for Jan. 12 and 14, 2014. Credit: Uwe Pilz



Pilz, a longtime contributor to the online Comets Mailing List for dedicated comet observers, has made a series of simulations of Comet ISON for mid-January using his own comet tail program. He bases his calculations on presumed larger particle sizes 1 mm – 10 mm – not the more common 0.3-10 micrometer fragments normally shed by comets. The assumption here is that ISON has remained virtually invisible since perihelion because it broke up into a smaller number of larger-than-usual pieces that don’t reflect light nearly as efficiently as larger amounts of smaller dust particles.


A slivery ISON on Jan. 16 widens a bit two days later in Pilz’s simulations. Click to see additional simulations. Credit: Uwe Pilz
A slivery ISON on Jan. 16 widens a bit two days later in Pilz's simulations. Credit: Uwe Pilz
The images look bizarre at first glance but totally make sense given the unique perspective. Notice that the debris stream becomes thinner as we approach orbital crossing; any potential dust blobs appear exactly edge-on similar to the way Saturn’s rings narrow to a “line” when Earth passes through the ring plane.

Besides the fact that not a single Earth-bound telescope has succeeded to date in photographing any of ISON’s debris, amateurs who attempt to fire one last volley the comet’s way will face one additional barrier – the moon. A full moon the same day as orbital crossing will make a difficult task that much more challenging. Digital photography can get around moonlight in many circumstances, but when it comes to the faintest of the faint, the last thing you want in your sky is the high-riding January moon. One night past full, a narrow window of darkness opens up and widens with each passing night.

Will anyone take up the challenge?

Read more: http://www.universetoday.com/107542/jan-16-may-be-last-best-chance-to-search-for-comet-isons-remains/#ixzz2pm5cr0Q8






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