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Posted by: Paolo Sep 12 2014, 03:33 PM

This, to my knowledge, is the first refereed paper to be published on Rosetta's observations of C-G (and it's free to access!):
http://www.aanda.org/articles/aa/full_html/2014/09/aa24590-14/aa24590-14.html

Posted by: Paolo Dec 10 2014, 08:39 PM

just out and already making noise on the social networks:
http://www.sciencemag.org/content/early/2014/12/09/science.1261952.abstract

Posted by: Doug M. Dec 11 2014, 04:47 AM

So here's a question. Apparently 67P was originally from the Kuiper Belt, but has been a Jupiter family comet for at least the last few centuries. A bit of googling doesn't turn up a strong estimate for when that transition occurred, though.

We know that water loss by evaporation, sublimation or UV cracking can affect DE/H ratios. Could a few million years of warm/cool cycles have done this for 67P?


Doug M.

Posted by: DFortes Dec 11 2014, 06:36 AM

Yes - there is a substantial difference in vapour pressure between light and heavy water ices (Vapor pressure of ice containing D₂O by Matsuo et al., 1964: 10.1126/science.145.3639.1454), which could lead to fractionation via a process such as sublimation. Indeed the fractionation factor for D₂O into the ice phase increases at lower T. Since 67P gives every appearance of having a highly porous but very strong substrate, I suspect that it is a well-sintered matrix of large grains cemented together by growth from a vapour phase transported through the large (and possibly well connected network of) interstitial pores.
As such, the D/H ratio may be a reflection of the degree of sintering and the thermal regime under which it occurred.

Posted by: Doug M. Dec 14 2014, 08:37 PM

Thank you -- that's very interesting.

If the ratio is a function of fractionation thanks to different vapor pressures, then you'd expect it to be highest where there's been most activity already, i.e. at the surface. It does make me wonder if we might see a shift in D/H as the comet gets closer to the Sun and more active. (The assumption here is that greater activity leads to outgassing from deeper inside the comet, which of course may not be the case.)


Doug M.

Posted by: Weywot Dec 17 2014, 04:27 PM

live stream of the AGU fall meeting press conference: http://www.ustream.tv/nasajpl2

I'm sure there will also be a recording available once the live stream is over.

Posted by: mcgyver Dec 19 2014, 10:57 AM

https://virtualoptions.agu.org/category/Fall+Meeting%3E2014+Fall+Meeting%3EPlanetary+Science/25431692

ADMIN: Requires a registration to view filed recordings.

Posted by: Paolo Dec 19 2014, 07:42 PM

this just out: http://www.aanda.org/articles/aa/abs/2015/01/aa24735-14/aa24735-14.html

Posted by: mcgyver Dec 20 2014, 04:35 PM

Here you can view official hires ROLIS descent images:
https://virtualoptions.agu.org/media/P34B-06.+Rosetta+2014+III%2C+Presented+By+Stefano+Mottola/0_m432jt2i

I don't know if now they're also available for download somewhere .


ADMIN: Once again, requires a registration to view filed recordings. You obviously never bothered to look at the comments on your previous posts in this thread.

Posted by: Weywot Dec 21 2014, 06:37 PM

The recording of the press conference can be seen on http://www.ustream.tv/recorded/56575467.

The link mcgyver posted leads to the archive of the recorded talks at the AGU Fall Meeting last week. Yes, a registration is needed, but it's free and I have never seen free recordings from a scientific conference. As Emily Lakdawalla https://twitter.com/elakdawalla/status/545605366080212992, the search word Rosetta gives all Rosetta/Philae related talks in the archive. Until now, 20 are listed: https://virtualoptions.agu.org/search/rosetta

The registration is worth it, for example in the talk from Stefano Mottola about the ROLIS results, all seven ROLIS images of the descent of Philae are shown and the ones from the last landing site with all the colour filters. I haven't seen all talks, some are quite, say "scientific", but what have I expected?
I think it's quite an opportunity to see the talks without attending the conference and without paying the conference fee.

Edit: I see, links to some of the talks and the ROLIS images have been posted in the other thread. (But hearing all the information from the scientists is better than seeing just the pictures.)

Posted by: mcgyver Dec 22 2014, 12:36 AM

Of course: it's the same site linked above. Same conditions apply. Thanks for stressing it.

Posted by: MargaritaMc Dec 24 2014, 05:26 PM

I have just tried to register and a charge of, I think, $50 was requested. I'm accessing from the Canary Islands, so perhaps that influences this?
I didn't continue with registration, not because the fee is excessive but because I'm only able to access the internet via an Android tablet at present, and anything that needs Flash is not viewable. (So I was simply checking to see if the files did need Flash, as ustream does but Livestream and YouTube don't)

By the way, the AGU Rosetta press conference is available on YouTube on the AGU channel. I won't try to post the link, as I assume that I will not yet have posting permission for hyperlinks.

Margarita

PS - later edit! I went back to the site and discovered I'd not read it properly. (Duh) The $50 is charged and then discounted !! So, no fee. I registered and have discovered that the videos are viewable on the Android tablet

Posted by: Paolo Jan 22 2015, 06:57 PM

here you go! today's Science has a first batch of Rosetta @ CG papers!
http://www.sciencemag.org/content/347/6220.toc

Posted by: Paolo Jan 22 2015, 07:09 PM

these two papers and their supplementary materials in particular have lots of OSIRIS imagery:
http://www.sciencemag.org/content/347/6220/aaa0440.abstract
http://www.sciencemag.org/content/347/6220/aaa1044.abstract

Posted by: Paolo Jan 22 2015, 07:12 PM

and some OSIRIS images finally online at ESA
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Highlights/Comet_close-ups

Posted by: Phil Stooke Jan 22 2015, 07:13 PM

Great stuff, wonderful results - and maps showing the naming convention being developed. I imagine those name illustrations will show up on the Rosetta site.

Phil

Posted by: Explorer1 Jan 22 2015, 07:24 PM

One of the supplements (Morphological Diversity) gives the following:

Posted by: belleraphon1 Jan 22 2015, 11:46 PM

Fantastic papers and image release...

Remember in 1965 waiting for the Sky & Telescope edition that would report on Mariner 4 images from Mars.
Now 50 years later I can sit on my couch using my 10.1 inch tablet to wander the Lovecraftian landscapes of a worldlet.

How cool is that...

Craig

Posted by: algorimancer Jan 23 2015, 03:29 PM

It occurs to me that, if the RSI were focused on a point on the surface, and has sufficiently fine time resolution, it might be feasible to perform remote seismology studies (similar to helioseismology). Passive observation of reflected solar radiation might be sufficient, or it might require active transmission and simultaneous monitoring of the response. It would be really neat to hear the internal sounds of an active comet. Presumably Philae would have provided more direct measurements of this.

Posted by: SpaceScout Jan 24 2015, 12:43 PM

the Science cover is just... wow!!!!!!

Posted by: katodomo Jan 24 2015, 03:30 PM

I don't know if people noticed, but for MIRO the Acknowledgement in one Science article notes at which exact date data for the instrument will be deposited in PSA and PDS - 19 May 2015.

Posted by: Paolo Jan 28 2015, 07:22 PM

more goodies, from Nature this time: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature14159.html

Posted by: mcgyver Jan 29 2015, 07:13 PM

I think nobody is talking about this here, but I think it's an amazing scientific result: Rosetta detected 350 micro-asteroids orbiting around 67P!!

http://blogs.esa.int/rosetta/2015/01/22/giadas-dust-measurements-3-7-3-4-au/

http://www.sciencemag.org/content/347/6220/aaa3905/suppl/DC1 gives more details: microsatellites were detected not by the dust grain detector (GIADA) but by the OSIRIS camera:

(so we have at least 25 hires images awaiting for release )

Posted by: Bill Harris Jan 29 2015, 08:45 PM

Whoa. I only did a quick initial scan the Rotundi, et al paper, but those grains are HUGE. I was thinking mm- to cm-sized particles. They are likely silicate/organics (doubtful with any ice) "fluffballs".

-Bill

Posted by: elakdawalla Jan 29 2015, 09:18 PM

At AGU Sierks showed one of the photos with this "snow" of particles in bound orbits. A few looked exactly as described in the paper -- alternating bright and dark, which he said you could use to determine their spin rate. So far we've pretty much only seen releases of OSIRIS images of the nucleus, none of these aimed at particles near the nucleus. I can't wait for the data set release to examine those.

Posted by: Sherbert Feb 2 2015, 11:45 PM

Related to the OSIRIS team morphology results. Here are some selections from the recent Lander Search image. I have tried to find examples of the types of terrain highlighted in the reports. To keep this post short my comments, guesses and theories(?) are given in the image descriptions.

https://www.flickr.com/photos/124013840@N06/16242211620/in/photostream/

https://www.flickr.com/photos/124013840@N06/16244259557/in/photostream/

https://www.flickr.com/photos/124013840@N06/16242484890/in/photostream/

https://www.flickr.com/photos/124013840@N06/16243056500/in/photostream/

I'm no geologist, so any suggestions/admonishments by those more qualified would be appreciated. Certainly Bill H. knows a whole lot more than me about this subject and no doubt Emily is writing a blog about this OSIRIS image for the Planetary Society right now.

Posted by: Jackbauer Feb 9 2015, 07:02 PM

http://blogs.esa.int/rosetta/2015/02/09/seasonal-forecasts-for-67pc-g/

Scientists from Rosetta’s OSIRIS team have been analysing the images of Comet 67P/Churyumov-Gerasimenko and comparing them to a thermal model to estimate how much material the various parts of the comet will lose through Sun-driven sublimation during one orbit. That is, as the Sun heats the comet, ices sublimate and the resulting gases drag dust into the comet’s coma
(…)

“Assuming that four times more dust is emitted than ice, our model leads to very different scenarios for the northern and southern hemisphere,” says OSIRIS scientist Stefano Mottola from the Institute for Planetary Research of the German Aerospace Center (DLR). “While during its short but intense summer the southern hemisphere may lose a surface layer measuring up to 20 metres in thickness, this value should be much smaller for the northern hemisphere. According to our estimations, only very few prominent peaks and cliffs may erode by more than ten metres over the course of one orbit.”

Posted by: MargaritaMc Feb 9 2015, 08:15 PM

The Max Planck Institute for Solar System Research press release is at this URL
http://www.mps.mpg.de/3903541/PM_2015_02_09_Rosetta_Komet_Auf_der_Suedseite_wird_s_heiss

Posted by: ngunn Feb 9 2015, 09:27 PM

The fact that the south side sublimes away faster than the north because it is facing the sun at perihelion provides a possible reason for the asymmetric position of the neck, offset from the centre line between the two lobes. When the contact binary formed the neck would have been on the centre line but the missing material has left it off to one side, giving the duck a north facing 'chin'. This narrative implies that at perihelion mass loss will occur more from the lobes than the neck, contrasting with what we see now as the northern hemi-object is illuminated. Let's see if that happens.

Posted by: Gerald Feb 9 2015, 09:45 PM

Regarding mass loss in the neck region they've a backdoor:

If it's richer in CO2 or CO the neck region may lose mass, too.
Maybe they find out more detail about the compositional variations during the close flyby to come.

Posted by: ngunn Feb 9 2015, 10:03 PM

Yep, that statement fits. The southern face should experience most of the sublimation at perihelion, but the nothern face willl be most actve in the periods before and after.

Posted by: belleraphon1 Mar 6 2015, 01:36 PM

Not sure where to put this...

Introducing the NAVCAM image browser
http://blogs.esa.int/rosetta/2015/03/06/introducing-the-navcam-image-browser/


"We are happy to announce that the first set of images from Rosetta's NAVCAM has now been made available to all scientific and public users via ESA’s Planetary Science Archive (PSA). This first batch of image data covers the period leading up to 2 July 2014, prior to Rosetta’s arrival at 67P/C-G. Further releases of image data will be made in blocks on a monthly basis henceforth, with the near-term aim to catch-up so that NAVCAM data will be publicly released six months after they are taken."

Posted by: Greenish Mar 6 2015, 02:55 PM

Following Phil's link in another thread, looks like another batch of Rosetta papers coming soon, but of course even the abstracts are fascinating.

From agenda of European Geosciences Union General Assembly 2015

http://meetingorganizer.copernicus.org/EGU2015/session/17358
Convener: Matthew Taylor | Co-Convener: Stephan ULAMEC
http://meetingorganizer.copernicus.org/EGU2015/orals/17358 / Mon, 13 Apr, 13:30–17:15 / Room Y5 / Tue, 14 Apr, 10:30–12:00 / 13:30–17:30 / Room Y5
http://meetingorganizer.copernicus.org/EGU2015/posters/17358 / Attendance Mon, 13 Apr, 17:30–19:00 / Red Posters

Lots there.

Posted by: Jackbauer Mar 17 2015, 09:11 AM

From the 46th Lunar and Planetary Science Conference

http://www.hou.usra.edu/meetings/lpsc2015/pdf/sess103.pdf

http://www.hou.usra.edu/meetings/lpsc2015/pdf/sess631.pdf

Posted by: scalbers Mar 21 2015, 02:09 PM

Is the neck region having a different composition really a sign of CG being a contact binary? Seems to me more like a single object with more ices near the center that are now exposed? This question was touched upon at a talk last evening by Joel Parker of the Southwest Research Institute (and the ALICE instrument).

Posted by: Gerald Mar 21 2015, 05:58 PM

A contact binary would probably be more interesting, but I share your preference for exposure of fresh interiour material of a single object.
Once the outermost crust is lost, sublimation may progress faster in that area, resulting in forming the neck.
The sublimation process of a prestine rotating cometary nucleus may start either near the equator for a spin axis parallel to the orbital axis, or near one of the poles if the pole happens to be directed towards the Sun near perihelion (skipping other options).
Taking the equator version the rotation axis may change (or precess) due to a change of the axis of maximum http://en.wikipedia.org/wiki/Moment_of_inertia due to preferred mass loss of the nucleus near the equator.

Posted by: scalbers Mar 21 2015, 06:09 PM

This preferential sublimation process seems interesting to me in for example how it might be modeled. Good food for thought with Gerald's scenarios. It also seems plausible in explaining some other similarly shaped comets.

Posted by: MarsInMyLifetime Mar 22 2015, 03:54 AM

What still keeps me from accepting the excavated neck story are the large pits on the main body that are closest to the crack in the neck. These have the appearance of some of the other vent pits on both bodies. If they are indeed expired vents, then they had to have formed earlier than the scree/talus that now spills into them from the head. They do not match the valley wall morphology further up the neck; they are positioned facing outward relative to the main body, and circular as if not influenced by earlier neck material. I just can't conceive a history of their formation relative to neck material deflation that would have been happening at the same time, were this a unified object rather than a piece rotated into place at a later era. I see the refill history of those pits as telling something about the sequence of activity/erosion in the neck.

Posted by: Paolo Mar 22 2015, 08:03 AM

BTW, if you have access to Science the nitrogen discovery paper is here:
http://www.sciencemag.org/content/early/2015/03/18/science.aaa6100

Posted by: algorithm Mar 22 2015, 08:13 PM

I was thinking about the 'Contact Binary. and the 'Eroded Neck' theories going on and thought I would add my twopence worth in favour of the 'Eroded Neck. camp.

While browsing here http://blogs.esa.int/rosetta/2015/03/20/cometwatch-14-march-6-hours-later/

This image

and this comment

"On the large lobe, another striking feature catches the eye: the Aten region, an elongated depression between Ash, to the left, and Khepry, to the right."

The difference between the smoother,elongated. central region compared to the left and right regions on the larger lobe, to my eye, also applies to the smaller lobe.

This would indicate the same process happened to both lobes together.

In other words they are the same object.

Posted by: DoF Mar 25 2015, 01:42 PM

I'm not sure I understand that reasoning. If we assume that the perihelion passages reforms the surface of the bodies, then the main surface features of both lobes would have been shaped by the same process at the same time regardless of whether it's a contact binary or not. If it is a binary object then they presumably joined before becoming a comet after all. It might indicate that both lobes have similar/same composition, but not that 67p is necessarily a single object.

Posted by: algorithm Mar 25 2015, 07:14 PM

Fair point!

The ratio between central area and left/right, also seems similar between the two lobes.....mmmmmmm...

So your rationale seems plausible for a contact binary. (As do others)

Lucky it's only twopence, but that's the beauty of armchair exploration.

Game on !!

Posted by: katodomo Apr 13 2015, 09:12 AM

Since we had a link to AGU webstreaming here's the European counterpart, albeit only with a single press conference streamed for Rosetta:

http://client.cntv.at/egu2015/PC1

Ulamec, Taylor and the PIs of ROMAP and RPC-MAG. Live on Tuesday, 1200 to 1300 UTC+2 (CEST).
Before that the stream will show previous press conferences (and something that looks like standup comedy in the press conference room in Austrian inbetween )

The above stream link offers a chat function to submit questions for the press conference remotely.

Related speech at EGU 2015: http://meetingorganizer.copernicus.org/EGU2015/session/17358

Abstracts for all speeches on Rosetta at EGU 2015 today and tomorrow: http://meetingorganizer.copernicus.org/EGU2015/orals/17358
And, perhaps oddly, abstracts for the poster session: http://meetingorganizer.copernicus.org/EGU2015/posters/17358
(edit: those two already posted earlier in this thread, here for completeness.)

Posted by: DoF Apr 14 2015, 12:29 PM

Thank you for the heads up katodomo, the stream is over but a video is now available. It deals mostly with Philae and the magnetic field of the comet, magnetic field information is also in a new Rosetta blog post (http://blogs.esa.int/rosetta/2015/04/14/rosetta-and-philae-find-comet-not-magnetised/).

Posted by: Paolo Apr 14 2015, 04:27 PM

and the Science preprint: http://www.sciencemag.org/content/early/2015/04/13/science.aaa5102

Posted by: remcook May 27 2015, 07:35 AM

Freely available new papers with early OSIRIS results now online:
http://arxiv.org/abs/1505.06888 (Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft)
http://arxiv.org/abs/1505.07021 (Comet 67P/Churyumov-Gerasimenko: Constraints on its origin from OSIRIS observations)

Posted by: Paolo May 27 2015, 08:07 AM

the second paper is particularly interesting, as it shows that 67P appears to be a contact binary after all

Posted by: MahFL May 27 2015, 11:49 AM

Obviously these papers are not for the general public consumption, because I hardly understood any of it, and all those equations !

Posted by: Bill Harris May 27 2015, 05:49 PM

They are looking at the mechanics and seeing if Kepler, et al think that the contact binary could happen.

In a way, with an object that has formed through accretion, where is the line drawn on the size of the accretionary elements? Parts up to one-quarter to one-half Km in size are identifiable, in addition to the two major lobes. And different morphologies of different regions can be attributed to differences in erosional characteristics.

It's a whole different world.

--Bill

Posted by: Paolo Jun 3 2015, 05:09 PM

early results from the ALICE UV spectrometer (in free access): http://www.aanda.org/component/article/?access=doi&doi=10.1051/0004-6361/201525925

Posted by: Jackbauer Jun 24 2015, 05:44 PM

http://www.aanda.org/articles/aa/pdf/forth/aa25977-15.pdf

OSIRIS observations of meter-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments

Posted by: 4throck Jun 25 2015, 10:10 AM

Some of the images on the paper in color here:
http://www.esa.int/spaceinimages/Images/2015/06/Ice_on_Comet_67P_Churyumov-Gerasimenko

Posted by: Paolo Jul 1 2015, 05:31 PM

new paper: http://www.nature.com/nature/journal/v523/n7558/full/nature14564.html
and as reported on the ESA site: http://www.esa.int/Our_Activities/Space_Science/Rosetta/Comet_sinkholes_generate_jets

Posted by: Mercure Jul 1 2015, 09:27 PM

The spectacular sinkhole discovery and images have quickly hit mainstream media: http://www.bbc.com/news/science-environment-33354872

Outgassing from the newly exposed sides of a sinkhole: Has anything similar ever been reported before in planetary science?

Posted by: climber Jul 22 2015, 07:19 AM

Scientists meet to share firsts Rosetta findings: https://m.youtube.com/watch?v=CXjWFTDuit0&feature=youtu.be

Posted by: climber Jul 23 2015, 01:40 PM

Ice inside Imhotep: http://blogs.esa.int/rosetta/2015/07/20/inside-imhotep-2/

Posted by: Paolo Jul 30 2015, 06:40 PM

scientific results from Philae are now out on Science!
http://www.sciencemag.org/content/vol349/issue6247/index.dtl
and shame on ESA, they are behind the paywall! Ehi guys, I paid for that probe!

Posted by: anticitizen2 Jul 30 2015, 09:03 PM

^removed

Posted by: Bill Harris Aug 21 2015, 11:43 AM

The ESA Rosetta Blog announces a couple of new papers out on Rosetta, plus a couple of articles in the ESA Web Portal:

Do comet fractures drive surface evolution?
http://blogs.esa.int/rosetta/2015/08/18/do-comet-fractures-drive-surface-evolution/#comment-509032

What made the comet sing?
http://blogs.esa.int/rosetta/2015/08/19/what-made-the-comet-sing/

Comet’s firework display ahead of perihelion
http://blogs.esa.int/rosetta/2015/08/11/comets-firework-display-ahead-of-perihelion/

Rosetta’s big day in the Sun
http://blogs.esa.int/rosetta/2015/08/13/rosettas-big-day-in-the-sun/

--Bill








And post-perihelion bursts of activity:

http://blogs.esa.int/rosetta/2015/08/28/cometwatch-22-august-2/

Posted by: flug Sep 9 2015, 11:45 PM

Yes, it's annoying to not have them available to everyone for review, discussion, etc. As (distant) 2nd best, there is something of a summary of the results published in Science at http://www.popularmechanics.com/space/deep-space/news/a16683/new-studies-comet-lander-philae/?zoomable.

Also, the main articles aren't available without a subscription, but the supplements are. Some of those have interesting material. Just for example:

• http://www.sciencemag.org/content/suppl/2015/07/29/349.6247.aab0639.DC1/Kofman-SM.pdf
• http://www.sciencemag.org/content/suppl/2015/07/29/349.6247.aaa9816.DC1/aaa9816-Biele-SM.pdf

The Philae Landing paper in particular has a bunch of interesting data, diagrams, graphs, photos, etc, relating to Philae's landing and flight across 67P. Just for example, they found the shadow of Philae on the 15:45 (post-first-impact) image and they include a couple of different possible reconstructions of Philae's post-impact trajectory--see attached.

Posted by: Jackbauer Sep 11 2015, 09:48 AM

Three papers on arXiv :

Gravitational slopes, geomorphology, and material strengths of the nucleus of comet 67P/Churyumov-Gerasimenko from OSIRIS observations
http://arxiv.org/abs/1509.02707

Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko
http://arxiv.org/abs/1509.02794

(nice OSIRIS pictures)

http://arxiv.org/abs/1509.03179
Rapid temperature changes and the early activity on comet 67P/Churyumov-Gerasimenko

Posted by: Bill Harris Sep 12 2015, 03:21 PM

Has any of the OSIRIS made it to a public archive yet?




Interesting idea, but I was reflecting the other day how the near- and post-perihelion activity has shifted from the neck region to the plains on the two lobes.

--Bill




EDIT
And a new paper out on “Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko” to be published in Astronomy & Astrophysics:

http://dx.doi.org/10.1051/0004-6361/201527020

authored by Olivier Groussin, et al. http://blogs.esa.int/rosetta/2015/09/18/comet-surface-changes-before-rosettas-eyes/

And an announcement that Rosetta is to be taking station at 1500Km from the nucleus in late September
http://blogs.esa.int/rosetta/2015/09/18/rosettas-far-excursion-to-study-the-coma-at-large/ . Mebbe they are expecting a big Kerblooie? Or just simply want the opportunity to get a series of wide coma images?

-b

Posted by: Paolo Sep 19 2015, 07:27 AM

new blog post and OSIRIS images: http://blogs.esa.int/rosetta/2015/09/18/comet-surface-changes-before-rosettas-eyes/
be sure to check also the free access A&A paper it refers to: http://www.aanda.org/component/article/?access=doi&doi=10.1051/0004-6361/201527020

Posted by: stone Sep 20 2015, 04:13 PM

After hearing two good talks about the Rosina Zoo of organic molecule at the Rosetta Science Meeting I wait for the publication of the newly found molecules. Nice compounds which will create a lot of dicussions on how they are formed and how they can survive on a comet.

Posted by: Bill Harris Sep 20 2015, 05:44 PM

http://www.sciencedaily.com/releases/2015/07/150730172518.htm

Is it from this work or from later data? There will no doubt be fascinating geochemistry based on temperatures and pressures _over the time period involved_ that would be impossible to duplicate in the lab.

--Bill

Posted by: stone Sep 20 2015, 06:48 PM

Sorry, but on this paper I am one of the coauthors, so this is not "new" for me. But the Rosina material is another teams data and so I have to wait for the meetings to get an update. The Zoo is large and the amount of compounds which can be still in the data and not yet identified might be large. I liked the groups made up by Kathrin Altwegg. The large ones and the small and flying ones an so on. I hope for a nice paper from ROSINA soon.

Posted by: Bill Harris Sep 20 2015, 10:42 PM

I'll (we'll) be looking forward to the new paper then. There is so much new ground being covered in this mission that we (y'all) will be working with it for years to come. And it all ties in with accretionary processes and the primordial solar nebula, which is quite mind-boggling.

--Bill

Posted by: Paolo Sep 23 2015, 05:45 PM

in this week's Nature: http://www.nature.com/nature/journal/v525/n7570/full/nature14869.html
and ESA's release http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_reveals_comet_s_water-ice_cycle

Posted by: Jackbauer Sep 26 2015, 09:15 AM

http://blogs.esa.int/rosetta/2015/09/25/rosina-detects-argon-at-comet-67pc-g/

ROSINA detects argon at Comet 67P
The noble gas argon has been detected in the coma of Comet 67P/Churyumov-Gerasimenko for the first time, thanks to the ROSINA mass spectrometer on-board Rosetta. Its detection is helping scientists to understand the processes at work during the comet’s formation, and adds to the debate about the role of comets in delivering various ‘ingredients’ to Earth

Posted by: Bill Harris Sep 28 2015, 04:59 PM

On the ESA site http://blogs.esa.int/rosetta/ --

Delving into the accretionary history of 67P--
blogs.esa.int/rosetta/2015/09/28/how-rosettas-comet-got-its-shape/


Rosetta presentations at EPSC--
http://blogs.esa.int/rosetta/2015/09/28/rosetta-at-epsc-watch-press-briefing-online/

Lots of good science.

--Bill




And Another paper announced:

“The "Dark Side" of 67P/Churyumov-Gerasimenko in Aug-Oct 2014 – MIRO/Rosetta continuum observations of polar night in the Southern regions,” by M. Choukroun et al, accepted for publication in Astronomy and Astrophysics.

http://blogs.esa.int/rosetta/2015/10/01/rosettas-first-peek-at-the-comets-south-pole/

--b



and a Dust Jet anaglyph:

http://blogs.esa.int/rosetta/2015/10/09/comet-jet-in-3d/

a how-to-deconstruct-an-anaglyph poster:
http://univ.smugmug.com/Sample-Gallery/i-987z2QF/0/L/Anaglyph_deconstruct-L.png

--b


Wisdom from Dr. Matteo Massironi:

http://blogs.esa.int/rosetta/2015/10/12/interpreting-images-more-on-how-the-comet-got-its-shape/

--b

Posted by: algorithm Oct 28 2015, 06:18 PM

Sitting by the fireside single malt in one hand, gently stroking long beard with the other.

Molecular oxygen in a comet eh? ..mmmm!?



https://t.co/Mpqe21Dt57

Posted by: Bill Harris Oct 30 2015, 08:32 AM

Molecular Oxygen, and primordial, too. That Solar Nebula was a happening place, no?
http://blogs.esa.int/rosetta/2015/10/28/first-detection-of-molecular-oxygen-at-a-comet/

Kicking back next to the Quartz heater with a cup o'hot cocoa with the Laptop...

--Bill



A fall of comet dust and a field of boulders
http://blogs.esa.int/rosetta/2015/11/09/a-fall-of-comet-dust-and-a-field-of-boulders/


New papers of note:

"Redistribution of particles across the nucleus of comet 67P/Churyumov-Gerasimenko"
http://www.aanda.org/articles/aa/abs/2015/11/aa26049-15/aa26049-15.html

"Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko"
http://www.aanda.org/articles/aa/abs/2015/11/aa25975-15/aa25975-15.html

Posted by: Paolo Oct 31 2015, 07:17 AM

an entire issue of Astronomy & Astrophysics dedicated to Rosetta pre-perihelion results!
http://www.aanda.org/articles/aa/abs/2015/11/contents/contents.html
many articles are in open access, others may require a (free) subscription

Posted by: Herobrine Nov 2 2015, 04:52 PM

Am I missing something, or are all but one of the start times wrong for Figure 3 in http://www.aanda.org/articles/aa/full_html/2015/11/aa25961-15/T1.html of http://www.aanda.org/articles/aa/pdf/2015/11/aa25961-15.pdf#page10? I don't read as many papers as a lot of you probably do, so I'm wondering if I'm somehow misinterpreting the table.

Posted by: Bill Harris Nov 11 2015, 11:29 AM

New paper and ESA Blog post:

The ups and downs of a comet’s surface
http://blogs.esa.int/rosetta/2015/11/11/the-ups-and-downs-of-a-comets-surface/

"Geomorphology and Spectrophotometry of Philae's Landing Site on Comet 67P Churyumov-Gerasimenko"
http://www.aanda.org/articles/aa/abs/2015/...aa25983-15.html



And a year's perspective: this was an initial geomorph assessment that I presented in ESA Blog Posts last year:

Geomorphology Gallery:
http://univ.smugmug.com/Rosetta-Philae-Mission/Rosetta-Geomorphology/

The first image is " The Geomorphology of the Agilkia landing site"
http://univ.smugmug.com/Rosetta-Philae-Mission/Rosetta-Geomorphology/i-FrrGcRD/0/L/Agilkia_landing_site_geomorph_basemap_res-L.png


The following features will be discussed in separate image poster-presentations:

Landing site
"Effusive" deposits
Residual scree
Plumed deposits
Pitted terrain
Deflated Terrain

Agilkia Geomorphology Map
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-x8LjfCB/0/L/Agilkia_landing_site_mosaic--OSIRIS--geomorph-terrain_basemap--annot-L.png

Landing Site Map
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-Nj4GkLh/0/L/landing_site-L.png

Effusive Deposits
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-rf46C56/0/L/effusive-L.png

Scree Deposits
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-5Vg3zGB/0/L/scree-L.png

Plumed Deposits
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-XRS3MbP/0/L/plumed-L.png

Pitted Terrain
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-jTZPBvT/0/L/pitted-L.png

Deflated Terrain
http://univ.smugmug.com/Rosetta-Philae-Mission/Philae/i-3WMk3Cv/0/L/deflate-L.png


--Bill

Posted by: Bill Harris Nov 12 2015, 03:47 PM

More articles in The Rosetta Blog today:

Rosetta Blog
http://blogs.esa.int/rosetta/



The ups and downs of a comet's surface
http://blogs.esa.int/rosetta/2015/11/11/the-ups-and-downs-of-a-comets-surface/

The sound of Philae conducting science
http://blogs.esa.int/rosetta/2015/11/12/the-sound-of-philae-conducting-science/

Reconstructing Philae's flight across the comet
http://blogs.esa.int/rosetta/2015/11/12/reconstructing-philaes-flight-across-the-comet/

Rosetta and Philae one year since landing on a comet
http://blogs.esa.int/rosetta/2015/11/12/rosetta-and-philae-one-year-since-landing-on-a-comet/

Video: science highlights one year since comet landing
http://blogs.esa.int/rosetta/2015/11/13/video-science-highlights-one-year-since-comet-landing/

From one comet landing to another: planning Rosetta's Grand Finale
http://blogs.esa.int/rosetta/2015/11/12/from-one-comet-landing-to-another-planning-rosettas-grand-finale/

Video: science highlights one year since comet landing
http://blogs.esa.int/rosetta/2015/11/13/video-science-highlights-one-year-since-comet-landing/

CometWatch 12 November – one year on
http://blogs.esa.int/rosetta/2015/11/13/cometwatch-12-november-one-year-on/


New Shape Model, more NavCam images to the archives
http://blogs.esa.int/rosetta/2015/11/30/new-comet-shape-model/



--Bill

Posted by: Paolo Dec 11 2015, 07:57 PM

new open access paper
http://www.aanda.org/articles/aa/abs/2016/01/aa27330-15/aa27330-15.html

Posted by: Paolo Jan 13 2016, 06:57 PM

new paper in Nature:
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature16190.html

Posted by: atomoid Nov 10 2016, 01:17 AM

not sure if this is best thread to post this but here is.. from phys.org with nice simulation movie: http://phys.org/news/2016-11-comet-67pchuryumov-gerasimenko-younger-previously-thought.html#nRlv

Posted by: Gerald Nov 10 2016, 12:29 PM

In this article&simulation, I'm missing a consistent explanation of the stratigraphy/layering on apparently any scale. Wouldn't such an energetic impact cause a much more heterogenious stratigraphy on the respective lobes?

Posted by: climber Aug 12 2019, 06:52 PM

A Moon around Chury ? http://www.esa.int/spaceinimages/Images/2019/08/An_unexpected_companion

Posted by: Explorer1 Oct 28 2020, 05:29 PM

Mystery of the second touchdown finally solved (with images and video):
https://www.dlr.de/content/en/articles/news/2020/04/20201028_4_5-billion-year-old-ice-on-comet-fluffier-than-cappuccino-froth.html