Nieuwe komeet ISON kan helderste in decennia worden?

quote:

Op donderdag 1 augustus 2013 01:25 schreef Probably_on_pcp het volgende:

[..]

Jij definieert jouw succes aan de hand van het feit dat je gaat trouwen en een kind krijgt, dus jouw mening telt niet.

Vrouwen

Trouwen en kinderen krijgen

Maar helaas is het geen mening, maar een feit

Rumors of Comet ISON ‘Fizzling’ May be Greatly Exaggerated

A press release out yesterday about a recent paper on Comet ISON has caused a mild uproar across the astronomy-minded social media outlets and some websites. The article issued from the Physics & Astrophysics Computation Group (FACOM) at the University of Antioquia in Medellin, Colombia is titled “Comet Of The Century? Not Yet! Comet C/2012 S1 ISON Has Fizzled Completely And May Disintegrate At Or Before Reaching Perihelion.”

The article had professional astronomers and comet enthusiasts alike shaking their heads in disbelief.

For one, any current determination of ISON’s ultimate fate when it gets close to the Sun later this year is speculation at best, (as is the case with almost any other sun-grazing comet) and since no one on planet Earth has seen ISON since it entered the Sun’s glare in June, there is absolutely no way to determine the comet’s current state, either. The almost unanimous shout from the astronomy internets was “Please! We just have to wait and see what happens with ISON.”

But the press release also had this journalist (and others) wondering if Ferrin’s views were taken out of context for the sake of a dramatic press release.

For example, nowhere in his paper does Ferrin say that Comet ISON has “fizzled,” (nor is there a direct quote in the press release with that word) and he does make it clear in his paper that his information about the comet is preliminary. However, the press release seemingly infers there was new data and that the comet is nothing short of dead.

But in an email from Ferrin, in response to an inquiry from Universe Today, Ferrin stands by the press release, as well as his opinion that Comet ISON “does not have a bright future.”

“The term ‘fizzled completely’ is not a scientific term so it should not go into a scientific paper,” Ferrin said. “However it reflects reality with the information we have.”

His paper (a full 51-pages) was posted to arXiv on June 20, 2013, and has been submitted to the Monthly Notices of the Royal Astronomical Society, still undergoing peer review. The paper is based on data available up to the last good observing date in late-May, 2013, and Ferrin said in his email to Universe Today that up to that point “there is no evidence of brightening whatsoever. I doubt that anybody has seen that brightening.”

Ferrin, a well-known cometary scientist, concurred that the comet’s current state is unknown because it has entered the Sun’s glare but when last seen it had not brightened at all, adding in his email that “the fact that the comet was in a standstill situation makes it very improbable of becoming as bright as the Moon.”
--------------------------------------------------------------------------------------------------------------------------------------------

En voor de 267457 keer heeft de pers het verhaal
verkeerd geinterpreteerd en heeft er weer eens een
opgeblazen sensatie verhaal van gemaakt....

Astronomer Captures Faint Comet ISON
^{August 20, 2013}


_{Image Caption: Bruce Gary's recovery image of Comet ISON (C2012 S1), taken on the morning of August 12th. The comet looks hardly better than it did last spring. Credit: Bruce Gary}

[ Watch the Video: ScienceCasts: Comet ISON to Fly By Mars ]

Lee Rannals for redOrbit.com – Your Universe Online

New observations of the highly anticipated Comet ISON have shown this year’s fall spectacle might not be as spectacular as we hoped.

According to Sky & Telescope, amateur imager Bruce Gary in Arizona has become the first astronomer to pick up Comet ISON after it was hidden behind the Sun for a two-and-a-half month period. Gary pointed his 11-inch telescope about six degrees above the eastern dawn horizon and was able to record a fuzzy point with an anti-sunward tail at the comet’s exact predicted position.

Sky & Telescope reported the comet is about 2 magnitudes fainter than the comet should be, according to previous predictions. So far, it has not improved on the two-magnitude deficit the comet was showing at the end of May before it tucked itself behind the sun away from our view.

“ISON is currently about at the distance from the Sun where water ice sublimation would be expected to be taking over in the comet’s photometric development,” comet analyst John Bortle told Sky & Telescope. “That the comet continues to appear as faint as it does implies that its intrinsic brightness (absolute magnitude) is low and that the nucleus is probably small and relatively inactive.”

Bortle went on to say “new” comets like ISON have turned out to be pretty lackluster, and “with very few exceptions, these comets brighten only very slowly.”

So; things are looking ever more bleak for chances of any grand display to be put on by ISON come this December. Still, I wouldn't fully commit to such until I see some actual visual observations reported, Bortle concluded.

Scientists have been warning all along that comets can be notorious for fizzling out before their big show. Comet ISON was positioned to give a great show this fall, with some predictions even saying the comet would be able to be seen in daylight with the naked eye.

The comet will be approaching within about 730,000 miles of the Sun by November. Scientists said the comet had the potential to become among the brightest comets of the last 50 years. However, Don Yeomans of NASA Near-Earth Object Program wasn’t quite buying into the hype of Comet ISON at the time.

“Comets are notoriously unpredictable,” said Yeomans. “I’m old enough to remember the last ‘Comet of the Century’. It fizzled.”

Source: Lee Rannals for redOrbit.com - Your Universe Online

Comet ISON Offers Doomsday Deja Vu

Dus, in december te zien?

Wat een rare naam voor een komeet

quote:

Op maandag 23 september 2013 19:31 schreef remlof het volgende:
Wat een rare naam voor een komeet

Comet ISON = International Scientific Optical Network (0.4-meter (16 in) reflector)

C/2012 S1, also known as Comet ISON or Comet Nevski–Novichonok, is a sungrazing comet discovered on 21 September 2012 by Vitali Nevski (Виталий Невский, Vitebsk, Belarus) and Artyom Novichonok (Артём Новичонок, Kondopoga, Russia). The discovery was made using the 0.4-meter (16 in) reflector of the
International Scientific Optical Network near Kislovodsk, Russia and the automated asteroid-discovery program CoLiTec. Precovery images by the Mount Lemmon Survey from 28 December 2011 and by Pan-STARRS from 28 January 2012 were quickly located. Follow-up observations were made on 22 September by a team from Remanzacco Observatory in Italy using the iTelescope network. The discovery was announced by the Minor Planet Center on 24 September.[6] Observations by SWIFT suggest that C/2012 S1's nucleus is around 5 kilometers (3.1 mi) in diameter.[8]

quote:

Op maandag 23 september 2013 22:35 schreef -CRASH- het volgende:

[..]

Comet ISON = International Scientific Optical Network (0.4-meter (16 in) reflector)

C/2012 S1, also known as Comet ISON or Comet Nevski–Novichonok, is a sungrazing comet discovered on 21 September 2012 by Vitali Nevski (Виталий Невский, Vitebsk, Belarus) and Artyom Novichonok (Артём Новичонок, Kondopoga, Russia). The discovery was made using the 0.4-meter (16 in) reflector of the
International Scientific Optical Network near Kislovodsk, Russia and the automated asteroid-discovery program CoLiTec. Precovery images by the Mount Lemmon Survey from 28 December 2011 and by Pan-STARRS from 28 January 2012 were quickly located. Follow-up observations were made on 22 September by a team from Remanzacco Observatory in Italy using the iTelescope network. The discovery was announced by the Minor Planet Center on 24 September.[6] Observations by SWIFT suggest that C/2012 S1's nucleus is around 5 kilometers (3.1 mi) in diameter.[8]

Ok, maar meestal worden kometen vernoemd naar de menselijke ontdekker, niet naar het instrument waarmee ze de komeet ontdekt hebben

quote:

Op maandag 23 september 2013 22:42 schreef remlof het volgende:

[..]

Ok, maar meestal worden kometen vernoemd naar de menselijke ontdekker, niet naar het instrument waarmee ze de komeet ontdekt hebben

Namen zullen wel op zijn

quote:

Op maandag 23 september 2013 23:00 schreef -CRASH- het volgende:

[..]

Namen zullen wel op zijn

Ok het is komeet Nevski-Novichonok.

Zie ook http://en.wikipedia.org/wiki/C/2012_S1

quote:

Op maandag 23 september 2013 23:01 schreef remlof het volgende:

[..]

Ok het is komeet Nevski-Novichonok.

Zie ook http://en.wikipedia.org/wiki/C/2012_S1

Daarom het ie ISON
Dat is een beetje makkelijker om uit te spreken

September 2013
In September, the comet will be visible near dawn in the Southern Hemisphere with binoculars.

Sept. 17-Oct. 15, 2013

Launch window for the Balloon Rapid Response for ISON, or BRRISON. This balloon, which with its payload will be 671 feet tall, taller than the Washington Monument, will launch from NASA’s Scientific Balloon Flight Facility in Fort Sumner, N.M. for a single day, carrying a 2.6-foot telescope and other science equipment. It will soar up to 23 miles above Earth’s surface, where it can observe the comet largely unhindered by Earth’s atmosphere.
BRRISON will observe ISON in the near-infrared, near-ultraviolet and visible wavelength ranges, and will measure the ratio of carbon dioxide to water emissions from the comet. This ratio will be a vital diagnostic of the comet’s origins. These emissions are blocked by Earth’s atmosphere and cannot be measured from the ground.

BRRISON is an unprecedented quick-reaction project to take advantage of the opportunity presented by the discovery of comet ISON, and is the first NASA Planetary Science Division balloon mission to observe a comet.

October 2013

Mars Curiosity and Opportunity will have a view of ISON in October, with Oct. 1, 2013, being the comet’s closest approach to Mars.
Comet ISON will be close enough to the sun, as of Oct. 10 that it will be visible by an instrument with an extremely wide view on one of the solar observatories: the HI 2 instrument on one of NASA’s Solar Terrestrial Relations Observatories, STEREO-A. At that point the comet will be around 94.5 million miles away from the sun.

Additional Hubble observations are planned to provide new estimates on nucleus size and composition as well as to search for any fragments that have broken off.

November 2013

Observations of Comet ISON with NASA's Chandra X-ray Observatory will be used to study particles streaming away from the sun in the solar wind. These particles from the sun interact with Comet ISON to generate X-rays that are detected by Chandra. The first of two sets of observations is planned for early November, when Comet ISON will be passing through the hot wind produced by regions along the sun's equator.

Nov. 16-19 & 21-26, 2013

Comet ISON will be visible to MESSENGER, which is near Mercury.
The closest approach will be on Nov. 19.
Once the comet passes Mercury, it will be on the most perilous part of its journey. The intense radiation of the sun causes material to evaporate quickly off the comet. Moreover the very pressure of the solar particles on the comet can cause it to break up. A slew of space and ground-based telescopes will watch the comet as it makes its slingshot around the sun.

Nov. 18-24, 2013

Launch window for NASA’s FORTIS (short for Far-ultraviolet Off Rowland-Circle for Imaging and Spectroscopy) sounding rocket, which will measure ultraviolet light from Comet ISON as it nears the sun. Such light can help scientists determine the production rate of volatile chemicals leaving the comet surface and also can be used to search for previously undetected types of atoms or molecules on the comet.

Nov. 21-30, 2013

As of Nov. 21, Comet ISON will begin to enter the fields of view of NASA’s space-based solar observatories. Comet ISON will be viewed first in what’s called coronagraphs, images that block the brighter view of the sun itself in order to focus on the solar atmosphere, the corona. Such images – from STEREO and the joint European Space Agency/NASA Solar Heliospheric Observatory, or SOHO -- will likely be quite visually compelling. NASA’s Solar Dynamics Observatory, or SDO, will view the comet for a few hours around perihelion. SDO’s imagery should be detailed enough to gather information about how the comet evolves through the radiation and pressure of the sun’s atmosphere.
All of these observatories will have different views. STEREO-A will be the only one that sees the comet transit across the face of the sun. In SDO’s view, the comet will appear to travel above the sun.

The exact dates of view for these observatories is as follows:

•Nov 21–28: STEREO-A HI1 sees comet
•Nov 26-29: STEREO-B coronagraphs sees comet
•Nov 27-30: SOHO sees comet in coronagraphs
•Nov 28-29: STEREO-A coronagraphs sees comet
•Nov 28: SDO sees comet (for a few hours)
In addition, ground-based solar telescopes – observing in optical, infrared and radio wavelengths – will all be able to observe the comet during perihelion. Such observations will provide additional information about the composition of the comet and how material evaporates off it, fueling the dusty cloud that surrounds the nucleus.

One last solar effect could impact the comet at this stage in its journey. If the sun coincidentally sends out a giant cloud of solar particles, known as a coronal mass ejection, at the right time and direction to pass the comet, it could pull the comet’s tail right off.

December 2013 - January 2014

If Comet ISON survives its trip around the sun, there’s a good chance that it will be incredibly bright and easily visible with the naked eye in the Northern Hemisphere. In early December, it will be seen in the morning, low on the horizon to the east-southeast. In late December and early January, it will be visible all night long.

A second set of Chandra observations is planned for the middle of December to early January, when ISON will be passing through a transition region in the solar wind, where the hot wind from the Sun's sun's equator is mixed with a cooler wind produced by regions near the poles of the sun.

December 26, 2013

Closest approach to Earth, just a third of the distance between Earth and the sun, at approximately 2.8 million miles away.

http://www.nasa.gov/conte(...)ourney/#.UkN5YIafgT8

New reseach shows Ison Will survive the Sun and will put on a show!



Great news for astronomers await Ison.... it looks like Ison will survive her encounter with the Sun, and will put on quite a show doing it! Today we have heard the conclusions from two separate research teams who have been studying Ison, and both have good news!

Planetary Science Institute scientist Dr Jian Yang Li, has been tasked with studying Ison.
Dr Jian Yang Li who is a world leading comet expert and has worked with NASA on the Deep Impact and Dawn missions, presented his research findings which were funded by NASA and the Space Telescope Science Institute to the American Astronomical Society's division for planetary sciences 45th Annual Meeting in Denver.

Dr Jian Yang Li said:
“We measured the rotational pole of the nucleus. The pole indicates that only one side of the comet is being heated by the sun on its way in until approximately one week before it reaches it closest point to the sun,
Since the surface on the dark side of the comet should still retain a large fraction of very volatile materials, the sudden exposure to the strong sunlight when it gets closer to the sun than Mercury could trigger huge outbursts of material. We measured the color of the coma, and found that the outer part of the coma is slightly redder than the inner part, This color change is unusual in comets, and seems to imply that the inner part contains some water ice grains, which sublimate as they move away from the nucleus.”
“As a first-time visitor to the inner solar system, Comet C/ISON provides astronomers a rare opportunity to study a fresh comet preserved since the formation of the Solar System, The expected high brightness of the comet as it nears the sun allows for many important measurements that are impossible for most other fresh comets.”

This image shows the color change of Comet C/ISON’s dust coma. The white dot at the center of the coma marks the location of the nucleus. ISON’s dust coma appears to be less red near the nucleus than it is further away from the nucleus. Although the color change is actually very small, it could be an indication of relatively more water ice particles near the nucleus. Those icy particles evaporate, as they move outward, makes the coma appear redder.

In a separate study by scientists at the Lowell Observatory and Southwest Research Institute (SwRI).
funded by NASA's Lunar Science Institute, carried out new numerical simulations and interpreted them using data from the historical records of Sun-grazing comet behavior.

Dr Kevin Walsh, a research scientist in SwRI's Planetary Science Directorate at Boulder, Colorado said:
"A major part of our work was to test if the encounter with the Sun would provide enough of a spin increase to pull material off the surface of the comet, When the comet passes near the Sun, it feels the tidal forces pulling on it, and it also gets a slight spin increase due to this rapid flyby. This spin increase is in the prograde direction, so if the comet is already spinning prograde, then it's just that much closer to spinning fast enough to lose mass.A non-spinning or retrograde (back-spinning) comet is more likely to survive because the "backspin" cancels out some of the tidal forces nearest the Sun. The opposite effect would be seen if the comet were spinning prograde, similar to a tennis ball with topspin. In that case, the spin direction would increase the tidal forces at the surface nearest the Sun and aggravate the disruptive potential, even for a comet of far greater density. The faster the prograde rotation and the lower its density, the greater the chances of a comet's disruption."

There has been a lot of speculation of late that Ison will not be as bright as previously thought. This research by the Planetary Science Institute shows that as Ison is not spinning as fast as we would normally expect a comet too. This means that some where in the region of half the ice and gasses that make up the tail are still locked up and waiting to be set free. It is these gases that make up the comets tail and coma. The study by the Lowell Observatory and Southwest Research Institute has given us new hope that Ison WILL survive its encounter with the sun and backs up the finds by the PSI. All in all today has been full of great news of astronomers across the world!

Ik hoop dat ze gelijk hebben!

Nice!

Ruimtedingen

Kometen Interessant topic om te lezen. Ben helemaal niet thuis in dit forum, maar ik ga het zeker in de gaten houden!

Hoop dat ie goed zichtbaar is
Ik was als 9 jarig jochie behoorlijk onder de indruk van Hale-Bopp

Wat is er nu zo spectaculair aan deze komeet? Er zijn toch vaker kometen te zien met het blote oog? Of wordt bedoeld dat je ze overdag ook kunt zien met het blote oog?

quote:

Op zondag 13 oktober 2013 19:36 schreef LXIV het volgende:
Wat is er nu zo spectaculair aan deze komeet? Er zijn toch vaker kometen te zien met het blote oog?

Niet zo vaak.

quote:

Op zondag 13 oktober 2013 19:36 schreef LXIV het volgende:
Wat is er nu zo spectaculair aan deze komeet? Er zijn toch vaker kometen te zien met het blote oog? Of wordt bedoeld dat je ze overdag ook kunt zien met het blote oog?

1. deze komt maar 1 keer langs. Het is er dus geen die om de xx jaar voorbij komt.
2. ISON scheert erg dicht over de zon... MAAR zal hoogstwaarschijnlijk niet op de zon crashen.
3. Mogelijk wordt ISON een komeet die je zelfs overdag kunt zien.

ISON... Mars... Regulus...


Details:

Today we have clear morning sky and three comets on the sky.
I tried to catch comet ISON with Mars and Regulus in one filed of my ED 80 f 400 mm refractor.
It is interesting, that comet and Mars are about 100 milion km away, but Regulus is 77 light years
and for surprise, there is also dwarf galaxy Leo I about 800 thousand light years away.

www.spaceweather.com