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3. The survival of comet ISON following perihelion is explainable under the EC model.
It is very difficult to explain under the DST model
Problem for you all is that Comet ISON or at least a large part of it is still with us, and on the same trajectory.
obvious there is something still there, huge and travelling along the original trajectory.
2013.12.10 Whitmer R
14-inch telescope, R-band, dozens of images, faintest stars with V-mag ~ 18: No sign of a comet!
2013.12.09 Whitmer R
Mosaic, 3x3, covering FOV = 36 x 31 'arc, R-band, with 14-inch telescope. Nothing seen brighter than ~ 16th mag.
This morning in clear skies in Highland Scotland I was able to take a series of 60s exposures of the ephemeris location of this comet using C14 telescope and a 300mm f/4 Apo lens and SBIG CCD cameras. The field was above 10 degrees altitude at the time of the exposures (06:30UT).
I was UNABLE to find any CONDENSED OBJECT at the ephemeris location down to mag 15 when compared to the DSS field image. It seems that no significant nucleus of this comet survived the perihelion passage.
Third night of searching for Comet Ison, from Drôme, France.
in a near perfect sky, I get no comet on images nor using 11x70 binoculars.
Limiting mag = 14+ No sign of the comet Ison.
After registration on the move of the comet : nothing to be seen too, with 102mm or telelens.
No visual sighting too, using 11x70 mm binocular....
Comet ISON, meanwhile, likely suffered a major disruption from its encounter with the sun in late November. NASA scientists are keeping an eye out for large fragments of the comet, but say that there is an over 90 percent probability that it was destroyed and only small pieces of rubble are left.
At the same time, there is a small chance that “a sizeable piee of the comet nucleaus” is left, NASA said in an update. Using a number of space telescopes, scientists will be keeping an eye out in the coming weeks.
Nice Video, points out that tiny Holmes appeared bigger than the sun, after re-lighting on it's trip out of the solar system. Dirty Snowball theory was completely put to bed at that time.
Sorry, but trapped layers of dust in a comet nucleus of 3.4 Km could not develop to be lager than our Sun, which is 1.4 Million Km in diameter. This is like claiming a rock 30 meters in diameter could produce enough dust to light up space so that it had a diameter as large as the Earth, 12,700 Km in diameter, And still remain intact.
Sublimation cannot be the reason for ISON's observed activity prior to passing Jupiter on its trajectory toward the Sun! Sublimation cannot therefore be a consistent concurrent phenomena with an observed coma.
reply to post by DJW001
The abstract you link to explains the outburst of comet Holmes as a result of the nature of the comet cover and the standard DST model requirement for a coma being the process of sublimation.
Sublimation cannot be the reason for ISON's observed activity prior to passing Jupiter on its trajectory toward the Sun! Sublimation cannot therefore be a consistent concurrent phenomena with an observed coma. So while this article you link to provides a reasonable explanation for the outburst of Comet Holmes for DST advocates, it cannot be extended as a causal factor for comet ISON.
edit on 11-12-2013 by Tallone because: (no reason given)
I could go on but most of the above elements I listed (CHON) are the most abundant elements out there, and it would hardly be surprising to find comets, asteroids, moons and planets made of these things.
And as you can see, even at the distance of Jupiter, these elements WILL start to sublimate.
Let us take a look at what the temperature is around the orbit of Jupiter (and we'll even use it's furthest distance from the sun):
We can find what the given temperature is depending upon your distance from the sun (but not including such things as atmospheric absorbtion, etc) by using this simple formula:
There is no way at all that comet ISON displayed comet activity at that distance due to sublimation. Period.
But that is beside the point because pre-discovery images of comet ISON was actually discovered at 8 AU distance.
For a comet to be active at that distance from the Sun completely destroys the DST position that comet ISON's activity was due to sublimation .