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Dec 12, 16.5 UT: Whitmer imaging shows that yesterday's "Blob A" must have been an artifact of unknown origin. Nothing was found in this morning's images, with a limiting Rc-mag ~ 18.2, so we take the position that we have not recovered Comet ISON. I will now begin to write the In Memoriam web page.
Dec 11, 21.9 UT: Possible recovery image by Dennis Whitmer on Dec 11, 12:52 UT. "Blob A" has Rc-mag = 15.91 at a location 10.3 'arc to northeast of the JPL Horizons predicted location. Please don't get excited by this; we need imaging from tomorrow to confirm or disconfirm the Blob A feature. I'm postponing writing the In Memoriam web page until this is resolved. (Good work, Dennis!)
Dec 11, 15.9 UT: I'm preparing an "In Memoriam for Comet ISON" web page which will have a link on this web page probably today.
Dec 10, 23.1 UT: Added a section (above) "My Current Assessment of Comet ISON's Status" in response to several e-mails that assume I know something about comets - which I don't, actually. Please, everybody, trust NASA, trust CIOC and trust professional astronomers at universities and institutions about Comet ISON. Some of them may be faulted for over-hyping this comet, but they're not hiding anything and Comet ISON really did provide a mountain of data that can improve our understanding of comets and formation processes of our solar system. Their assessments will be much more valid than mine!
Pinkorchid
Ok think I have found something of interest to this thread. Its information from some Comet ISON Observations by Three Non-Professional Observers,Bruce Gary, Dennis Whitmer and Tom kaye, using 11-inch, 14-inch and 32-inch telescopes, respectively
My Current Assessment of Comet ISON's Status:
Based on the evidence currently available, I believe that a few hours prior to perihelion the gravitational gradients produced by the sun, combined with the heat that sublimated ice (which is like a glue that was holding the particles together), led to the nucleus breaking up, producing a field of particles and clumps of particles moving apart. With this breakup there was a sudden increase in total surface area for the same mass, and being this close to the sun these particles were quickly heated and produced a burst of outgassing; this could explain the brightening prior to perihelion encounter. After perihelion there was no evidence of a nucleus-based coma, which is consistent with the breakup and outgassing that occurred hours earlier. Instead, there was the appearance of a cloud of particles that was undergoing dispersion due to both the solar wind and light pressure. The solar wind would capture particles, molecules and atoms that were ionized, and carry them away at high speed; the neutral particles would be pushed away from the sun by sunlight pressure. The fading that was seen after perihelion is consistent with this scenario, and suggests that ever since then the material that constituted the comet before perihelion simply continued to disperse and become so spread out that no imaging can be counted upon to capture what's left of the comet. In addition, there may be no more outgassing (for producing a coma and tail) because of the high temperatures that all particles and clumps of particles experienced at perihelion. In other words, I think Comet ISON is dead!
Dec 12, 16.5 UT: Whitmer imaging shows that yesterday's "Blob A" must have been an artifact of unknown origin. Nothing was found in this morning's images, with a limiting Rc-mag ~ 18.2, so we take the position that we have not recovered Comet ISON. I will now begin to write the In Memoriam web page.
wildespace
If ISON, according to EC, is a large solid object like an asteroid, and has survived perihelion, surely it would be possible to detect it in a decent amateur telescope.
HumAnnunaki
ISON can ONLY be detected by Infra-Red telescopes...
HumAnnunaki
wildespace
If ISON, according to EC, is a large solid object like an asteroid, and has survived perihelion, surely it would be possible to detect it in a decent amateur telescope.
ISON can ONLY be detected by Infra-Red telescopes
which are much too expensive for amateurs to own.
NASA space telescopes may not of been able to track ISONs
speed and trajectory but NASA does own ground based Infra-Red telescopes.
For those whom still believe ISON is still at large (pardon the pun)
Check out this thread and please follow it to the end...
(only 4 pages, fun read)
Someone is saying ISON is alive and on an impact course
with mother Earth for December 21st 2013!
(I welcome debunkers)
www.abovetopsecret.com...
Enjoyedit on 13-12-2013 by HumAnnunaki because: (no reason given)
alfa1
No, seriously, you just made that up off the top of your head just now.
Otherwise cite a source for that stupid claim, please.
HumAnnunaki
here is the LINK you requested and the info is at the top of that page coolcosmos.ipac.caltech.edu...
HumAnnunaki
In the ATS thread I linked to (my own) it explains why ISON can't be seen..
DenyObfuscation
reply to post by HumAnnunaki
I don't think your link says what you think it says.
Could you be specific please?edit on 13-12-2013 by DenyObfuscation because: bad spellens kontajus
Where can I purchase an infrared telescope for backyard use?
You can't. Most infrared light from celestial sources is absorbed by the Earth's atmosphere. Only a narrow window of near-infrared radiation (at wavelengths less than about 4 microns) reaches the Earth. Observations at these wavelengths requires that the infrared camera be cooled to hundreds of degrees below zero using a cryogen (such as liquid helium) and requires special solid-state infrared detectors (costing tens of thousands of dollars). Hence, it is impractical to consider a true infrared telescope for personal use.
Hope I've helped
alfa1
That link does not mention comet ISON, nor indeed any comets at all.
That thread does not mention Infra Red astronomy... nor indeed any actual astronomy at all.
HumAnnunaki
Five concentric boxes at top of C.C reference a telescope pointing into the sky.
So in sense, we are being told the fragments of ISON can only be detected under Infra/Red telescope
alfa1
I was right then.
You just pulled the assertion about comet ISON and IR astronomy out of your arse.