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
just out and already making noise on the social networks:
http://www.sciencemag.org/content/early/2014/12/09/science.1261952.abstract
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.
this just out: http://www.aanda.org/articles/aa/abs/2015/01/aa24735-14/aa24735-14.html
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.
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.)
here you go! today's Science has a first batch of Rosetta @ CG papers!
http://www.sciencemag.org/content/347/6220.toc
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
and some OSIRIS images finally online at ESA
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Highlights/Comet_close-ups
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
One of the supplements (Morphological Diversity) gives the following:
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
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.
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.
more goodies, from Nature this time: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature14159.html
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!!
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.
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.
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.”
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
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.
Regarding mass loss in the neck region they've a backdoor:
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.
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."
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
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
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.
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.
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.
BTW, if you have access to Science the nitrogen discovery paper is here:
http://www.sciencemag.org/content/early/2015/03/18/science.aaa6100
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
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.
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 !!
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.)
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/).
and the Science preprint: http://www.sciencemag.org/content/early/2015/04/13/science.aaa5102
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)
the second paper is particularly interesting, as it shows that 67P appears to be a contact binary after all
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
early results from the ALICE UV spectrometer (in free access): http://www.aanda.org/component/article/?access=doi&doi=10.1051/0004-6361/201525925
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
Some of the images on the paper in color here:
http://www.esa.int/spaceinimages/Images/2015/06/Ice_on_Comet_67P_Churyumov-Gerasimenko
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
Scientists meet to share firsts Rosetta findings: https://m.youtube.com/watch?v=CXjWFTDuit0&feature=youtu.be
Ice inside Imhotep: http://blogs.esa.int/rosetta/2015/07/20/inside-imhotep-2/
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!
removed
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/
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
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
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.
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
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
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
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
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
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
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
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.
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
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
new open access paper
http://www.aanda.org/articles/aa/abs/2016/01/aa27330-15/aa27330-15.html
new paper in Nature:
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature16190.html
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
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?
A Moon around Chury ? http://www.esa.int/spaceinimages/Images/2019/08/An_unexpected_companion
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
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