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Message Subject BREAKING: Scientist claims comet ISON has companions!
Poster Handle Dr. Astro
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Well, the only way to know this for sure will be when it is closer to Mars, to us...etc Maybe from September we'll have a better data to contrast.
Quoting: pstrusi

No, we already know this for sure, the astrophotographer himself confirmed it. It's hot pixels, end of story.
Quoting: Dr. Astro

No, we know of the hot pixels, we can't be 100% sure ISON is alone until it gets closer is what they are saying.
Quoting: --Voltaic--

Oh really? You speak for the other poster? He said the only way to know "this" in direct response to what I was talking about. I was talking about the hot pixels in the image.
And I agree, there could be things hitching a ride behind ISON.
Quoting: Voltaic

Let's assume for a moment ISON is a fairly big comet at about 20km diameter for its physical nucleus. Its volume would then be about 4,188,790,200,000 m^3. If we assume a density of about 1500 kg/m^3 (and that's extremely generous, realistically it'd be closer to 400 kg/m^3) then the total mass is about 6.2831853 x 10^15 kg. If an object were orbiting a comet with that mass at any kind of distance, it wouldn't remain in orbit of it. If an object tried to orbit it at the distance that the moon is from earth, for instance, then it would take over 2000 years to complete a single orbit.

It wouldn't even still be orbiting it though, it would have been stripped off by the sun by now. The comet is currently about 5 AUs from the sun. The current difference in gravitational acceleration due to the sun over the distance of the object orbiting the comet would be about 2.25 x 10-10 m/s^2. That may not sound like much, but it's two orders magnitude higher than the acceleration such an object would experience from the comet, which would only be about 2.84 x 10^-12 m/s^2. In other words, even if an object were "trailing" it as close as the moon is from earth, it would have been peeled off by the sun a while ago. At further orbital distances it would have been ripped away sooner still. In order to stably orbit the comet, an object would have to assume a much lower orbit and be virtually indistinguishable from the comet's nucleus.

McCanney has claimed that the comet is being orbited by objects at two lunar distances. That is in direct contradiction to the evidence. The comet would have to be much, much more massive for that to be the case, and that is his claim indeed. He claims it's the size of the earth or larger. He's STILL claiming Pete's image of the comet showed "companions" but now he's now gone to claim that Pete's images were a NASA hoax to bait him into claiming the presence of companions so that they could then debunk it. He's a full-on nutjob.
ISON may also break up into several smaller pieces as it gets closer to the Sun. Noting ISON hasn't been "melted" yet by the Sun as far as we know.
Quoting: Voltaic

Things in space don't melt, they sublimate, and the comet is sublimating which is why it has a coma, it's just not all that much yet. Yes it could break up into pieces, and then those pieces would continue along the original orbit of the comet. What does that have to do with anything McCanney claimed?
Quoting: Dr. Astro

By the way, that nutjob McCanney is claiming that Pete's images were a hoax to bait him into claiming his images showed companions and that this NASA video shows Pete's images without the companions as a way to debunk his claim:
[link to www.youtube.com]
He's lying and hoping people like me don't notice. The hot pixels are still there in the above NASA video. Pete's time lapse is the first segment show, as per McCanney's description, but the hot pixels are still there.

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