Rosetta scientific results |
Rosetta scientific results |
Sep 12 2014, 03:33 PM
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#1
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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!):
The rotation state of 67P/Churyumov-Gerasimenko from approach observations with the OSIRIS cameras on Rosetta |
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Dec 10 2014, 08:39 PM
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#2
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
just out and already making noise on the social networks:
67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio QUOTE The provenance of water and organic compounds on the Earth and other terrestrial planets has been discussed for a long time without reaching a consensus. One of the best means to distinguish between different scenarios is by determining the D/H ratios in the reservoirs for comets and the Earth’s oceans. Here we report the direct in situ measurement of the D/H ratio in the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA mass spectrometer aboard ESA’s Rosetta spacecraft, which is found to be (5.3 ± 0.7) × 10−4, that is, ~3 times the terrestrial value. Previous cometary measurements and our new finding suggest a wide range of D/H ratios in the water within Jupiter family objects and preclude the idea that this reservoir is solely composed of Earth ocean-like water.
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Dec 11 2014, 04:47 AM
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#3
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Member Group: Members Posts: 102 Joined: 8-August 12 Member No.: 6511 |
just out and already making noise on the social networks: 67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio 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. |
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Dec 11 2014, 06:36 AM
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#4
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Junior Member Group: Members Posts: 41 Joined: 11-April 07 From: London, U.K. Member No.: 1957 |
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. 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. |
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Dec 14 2014, 08:37 PM
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#5
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Member Group: Members Posts: 102 Joined: 8-August 12 Member No.: 6511 |
As such, the D/H ratio may be a reflection of the degree of sintering and the thermal regime under which it occurred. 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. |
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Dec 17 2014, 04:27 PM
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#6
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Junior Member Group: Members Posts: 22 Joined: 15-November 14 Member No.: 7320 |
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. |
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Dec 19 2014, 10:57 AM
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#7
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
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. https://virtualoptions.agu.org/category/Fal...cience/25431692 ADMIN: Requires a registration to view filed recordings. |
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Dec 19 2014, 07:42 PM
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#8
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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Dec 20 2014, 04:35 PM
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#9
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
Here you can view official hires ROLIS descent images:
https://virtualoptions.agu.org/media/P34B-0...tola/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. |
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Dec 21 2014, 06:37 PM
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#10
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Junior Member Group: Members Posts: 22 Joined: 15-November 14 Member No.: 7320 |
The recording of the press conference can be seen on ustream.
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 tweeted, 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.) |
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Dec 22 2014, 12:36 AM
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#11
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
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Dec 24 2014, 05:26 PM
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#12
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Newbie Group: Members Posts: 4 Joined: 29-September 14 From: 28°16'7"N 16°36'20"W Member No.: 7268 |
Of course: it's the same site linked above. Same conditions apply. Thanks for stressing it. 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 -------------------- "In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen |
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Jan 22 2015, 06:57 PM
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#13
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
here you go! today's Science has a first batch of Rosetta @ CG papers!
http://www.sciencemag.org/content/347/6220.toc |
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Jan 22 2015, 07:09 PM
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#14
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
these two papers and their supplementary materials in particular have lots of OSIRIS imagery:
The morphological diversity of comet 67P/Churyumov-Gerasimenko On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko |
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Jan 22 2015, 07:12 PM
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#15
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
and some OSIRIS images finally online at ESA
http://www.esa.int/Our_Activities/Space_Sc...Comet_close-ups |
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Jan 22 2015, 07:13 PM
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#16
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 22 2015, 07:24 PM
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#17
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
One of the supplements (Morphological Diversity) gives the following:
QUOTE The regions on comet 67P/Churyumov-Gerasimenko are given names of ancient Egyptian deities. The regions on the “head” part are given female names whereas the regions on the “body” and “neck” are assigned male names
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Jan 22 2015, 11:46 PM
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#18
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Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
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 |
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Jan 23 2015, 03:29 PM
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#19
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
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.
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Jan 24 2015, 12:43 PM
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#20
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Junior Member Group: Members Posts: 31 Joined: 3-August 14 From: Germany Member No.: 7229 |
here you go! today's Science has a first batch of Rosetta @ CG papers! http://www.sciencemag.org/content/347/6220.toc the Science cover is just... wow!!!!!! -------------------- space scout
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Jan 24 2015, 03:30 PM
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#21
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Junior Member Group: Members Posts: 78 Joined: 20-September 14 Member No.: 7261 |
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.
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Jan 28 2015, 07:22 PM
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#22
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
more goodies, from Nature this time: Comet 67P/Churyumov-Gerasimenko sheds dust coat accumulated over the past four years
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Jan 29 2015, 07:13 PM
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#23
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
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!!
QUOTE considering measurements made with both GIADA and OSIRIS on 4 August 2014, when we were still at 275 km from the comet. These observations allowed us to count about 350 grains in bound orbits around the comet nucleus, and 48 fast, out-flowing grains that were ejected about a day before the observations. http://blogs.esa.int/rosetta/2015/01/22/gi...nts-3-7-3-4-au/ Supplemental material gives more details: microsatellites were detected not by the dust grain detector (GIADA) but by the OSIRIS camera: QUOTE We consider OSIRIS-NAC images (2048 x 2048 px) taken on 4 August 2014 from 3h49UT to 5h53UT at 3.6 AU from the Sun. These images are taken in sets repeated 5 times, with an interval of 26 minutes between each set. Each of these 5 sets contains 5 images with an exposure of 17.25 s taken every minute using the NAC's orange filter (centred on 649 nm, 84.5 nm wide). (so we have at least 25 hires images awaiting for release ) QUOTE In the composite image, covering a time interval of 197.25 s, every moving object appears as a sequence of white, black, white and black tracks (fast moving grains) or dots (slow moving grains), thus allowing us to define its apparent speed and direction of motion QUOTE . Assuming a mean albedo of 5%, we get a diameter range from 0.2 to 2 m for grains at the outermost limit of the grain cloud (at about 600 km from the spacecraft; the size of 2 m is a crude upper limit: it assumes that the brightest grains are also the farthest); and from 4 to 40 cm for grains at 130 km from the spacecraft
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Jan 29 2015, 08:45 PM
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#24
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE diameter range from 0.2 to 2 m 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 -------------------- |
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Jan 29 2015, 09:18 PM
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#25
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
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.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Feb 2 2015, 11:45 PM
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#26
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Member Group: Members Posts: 153 Joined: 20-December 14 From: Eastbourne, UK Member No.: 7372 |
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...in/photostream/ https://www.flickr.com/photos/124013840@N06...in/photostream/ https://www.flickr.com/photos/124013840@N06...in/photostream/ https://www.flickr.com/photos/124013840@N06...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. |
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Feb 9 2015, 07:02 PM
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#27
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
http://blogs.esa.int/rosetta/2015/02/09/se...sts-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.” |
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Feb 9 2015, 08:15 PM
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#28
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Newbie Group: Members Posts: 4 Joined: 29-September 14 From: 28°16'7"N 16°36'20"W Member No.: 7268 |
The Max Planck Institute for Solar System Research press release is at this URL
Rosetta: Comet’s South Heats Up -------------------- "In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen |
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Feb 9 2015, 09:27 PM
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#29
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
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.
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Feb 9 2015, 09:45 PM
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#30
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Regarding mass loss in the neck region they've a backdoor:
QUOTE The neck area between the comet’s two lobes is particularly weakly insolated. At the same time, it has displayed the strongest and earliest dust activity in the past months. The scientists therefore believe that possibly this region has a different composition than the rest of the comet. 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. |
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Feb 9 2015, 10:03 PM
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#31
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
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.
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Mar 6 2015, 01:36 PM
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#32
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Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
Not sure where to put this...
Introducing the NAVCAM image browser http://blogs.esa.int/rosetta/2015/03/06/in...-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." |
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Mar 6 2015, 02:55 PM
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#33
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Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
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 Rosetta: first results from the prime mission Lots there. |
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Mar 17 2015, 09:11 AM
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#34
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
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 |
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Mar 21 2015, 02:09 PM
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#35
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
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. 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). -------------------- Steve [ my home page and planetary maps page ]
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Mar 21 2015, 05:58 PM
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#36
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
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 moment of inertia due to preferred mass loss of the nucleus near the equator. |
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Mar 21 2015, 06:09 PM
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#37
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
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.
-------------------- Steve [ my home page and planetary maps page ]
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Mar 22 2015, 03:54 AM
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#38
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Member Group: Members Posts: 148 Joined: 9-August 11 From: Mason, TX Member No.: 6108 |
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.
-------------------- --
Don |
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Mar 22 2015, 08:03 AM
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#39
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
BTW, if you have access to Science the nitrogen discovery paper is here:
Molecular nitrogen in comet 67P/Churyumov-Gerasimenko indicates a low formation temperature |
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Mar 22 2015, 08:13 PM
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#40
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Member Group: Members Posts: 334 Joined: 11-December 12 From: The home of Corby Crater (Corby-England) Member No.: 6783 |
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/co...-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. |
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Mar 25 2015, 01:42 PM
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#41
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Junior Member Group: Members Posts: 25 Joined: 22-November 14 Member No.: 7349 |
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.
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Mar 25 2015, 07:14 PM
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#42
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Member Group: Members Posts: 334 Joined: 11-December 12 From: The home of Corby Crater (Corby-England) Member No.: 6783 |
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 !! |
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Apr 13 2015, 09:12 AM
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#43
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Junior Member Group: Members Posts: 78 Joined: 20-September 14 Member No.: 7261 |
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.) |
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Apr 14 2015, 12:29 PM
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#44
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Junior Member Group: Members Posts: 25 Joined: 22-November 14 Member No.: 7349 |
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/ro...not-magnetised/).
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Apr 14 2015, 04:27 PM
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#45
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
and the Science preprint: The nonmagnetic nucleus of comet 67P/Churyumov-Gerasimenko
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May 27 2015, 07:35 AM
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#46
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
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) |
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May 27 2015, 08:07 AM
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#47
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the second paper is particularly interesting, as it shows that 67P appears to be a contact binary after all
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May 27 2015, 11:49 AM
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#48
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Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
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May 27 2015, 05:49 PM
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#49
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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 -------------------- |
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Jun 3 2015, 05:09 PM
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#50
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
early results from the ALICE UV spectrometer (in free access): Measurements of the near-nucleus coma of comet 67P/Churyumov-Gerasimenko with the Alice far-ultraviolet spectrograph on Rosetta
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Jun 24 2015, 05:44 PM
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#51
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
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 |
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Jun 25 2015, 10:10 AM
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#52
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Junior Member Group: Members Posts: 64 Joined: 17-December 12 From: Portugal Member No.: 6792 |
Some of the images on the paper in color here:
http://www.esa.int/spaceinimages/Images/20...mov-Gerasimenko -------------------- www.astrosurf.com/nunes
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Jul 1 2015, 05:31 PM
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#53
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
new paper: Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse
and as reported on the ESA site: http://www.esa.int/Our_Activities/Space_Sc...s_generate_jets |
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Jul 1 2015, 09:27 PM
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#54
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Junior Member Group: Members Posts: 88 Joined: 8-May 14 Member No.: 7185 |
new paper: Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse and as reported on the ESA site: http://www.esa.int/Our_Activities/Space_Sc...s_generate_jets 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? |
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Jul 22 2015, 07:19 AM
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#55
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Scientists meet to share firsts Rosetta findings: https://m.youtube.com/watch?v=CXjWFTDuit0&a...eature=youtu.be
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Jul 23 2015, 01:40 PM
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#56
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Ice inside Imhotep: http://blogs.esa.int/rosetta/2015/07/20/inside-imhotep-2/
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Jul 30 2015, 06:40 PM
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#57
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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! |
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Jul 30 2015, 09:03 PM
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#58
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Member Group: Members Posts: 201 Joined: 16-December 13 Member No.: 7067 |
removed
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Aug 21 2015, 11:43 AM
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#59
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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...#comment-509032 What made the comet sing? http://blogs.esa.int/rosetta/2015/08/19/wh...the-comet-sing/ Comet’s firework display ahead of perihelion http://blogs.esa.int/rosetta/2015/08/11/co...-of-perihelion/ Rosetta’s big day in the Sun http://blogs.esa.int/rosetta/2015/08/13/ro...day-in-the-sun/ --Bill And post-perihelion bursts of activity: http://blogs.esa.int/rosetta/2015/08/28/co...ch-22-august-2/ -------------------- |
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Sep 9 2015, 11:45 PM
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#60
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Junior Member Group: Members Posts: 46 Joined: 20-November 14 Member No.: 7342 |
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! 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 Popular Mechanics. Also, the main articles aren't available without a subscription, but the supplements are. Some of those have interesting material. Just for example: 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. |
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Sep 11 2015, 09:48 AM
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#61
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
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 |
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Sep 12 2015, 03:21 PM
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#62
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE (nice OSIRIS pictures) Has any of the OSIRIS made it to a public archive yet? QUOTE Rapid temperature changes and the early activity... 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/co...-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/ro...-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 -------------------- |
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Sep 19 2015, 07:27 AM
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#63
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
new blog post and OSIRIS images: Comet surface changes before Rosetta's eyes
be sure to check also the free access A&A paper it refers to: Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko |
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Sep 20 2015, 04:13 PM
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#64
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Junior Member Group: Members Posts: 93 Joined: 21-January 13 Member No.: 6845 |
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.
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Sep 20 2015, 05:44 PM
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#65
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE Organic molecules on comets: Philae's first results from Churi prove surprising Date: July 30, 2015 Source: CNRS Summary: Organic molecules never previously observed in comets, a relatively varied structure on the surface but a fairly homogeneous interior, organic compounds forming agglomerates rather than being dispersed in the ice: these are just some of first results provided by Philae on the surface of comet Churi. These in situ findings, which contain a wealth of completely new information, reveal several differences in comparison with previous observations of comets and current models... http://www.sciencedaily.com/releases/2015/...50730172518.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 -------------------- |
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Sep 20 2015, 06:48 PM
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#66
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Junior Member Group: Members Posts: 93 Joined: 21-January 13 Member No.: 6845 |
http://www.sciencedaily.com/releases/2015/...50730172518.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 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. |
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Sep 20 2015, 10:42 PM
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#67
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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 -------------------- |
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Sep 23 2015, 05:45 PM
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#68
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
in this week's Nature: The diurnal cycle of water ice on comet 67P/Churyumov–Gerasimenko
and ESA's release http://www.esa.int/Our_Activities/Space_Sc...water-ice_cycle |
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Sep 26 2015, 09:15 AM
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#69
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
http://blogs.esa.int/rosetta/2015/09/25/ro...t-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 |
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Sep 28 2015, 04:59 PM
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#70
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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/ro...riefing-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/ro...ets-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-9...construct-L.png --b Wisdom from Dr. Matteo Massironi: http://blogs.esa.int/rosetta/2015/10/12/in...-got-its-shape/ --b -------------------- |
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Oct 28 2015, 06:18 PM
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#71
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Member Group: Members Posts: 334 Joined: 11-December 12 From: The home of Corby Crater (Corby-England) Member No.: 6783 |
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 |
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Oct 30 2015, 08:32 AM
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#72
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
Molecular Oxygen, and primordial, too. That Solar Nebula was a happening place, no?
http://blogs.esa.int/rosetta/2015/10/28/fi...gen-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-...ld-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/...aa26049-15.html "Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko" http://www.aanda.org/articles/aa/abs/2015/...aa25975-15.html -------------------- |
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Oct 31 2015, 07:17 AM
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#73
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
an entire issue of Astronomy & Astrophysics dedicated to Rosetta pre-perihelion results!
http://www.aanda.org/articles/aa/abs/2015/...s/contents.html many articles are in open access, others may require a (free) subscription |
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Nov 2 2015, 04:52 PM
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#74
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Member Group: Members Posts: 244 Joined: 2-March 15 Member No.: 7408 |
Am I missing something, or are all but one of the start times wrong for Figure 3 in Table A.1 of Morphology and dynamics of the jets of comet 67P/Churyumov-Gerasimenko: Early-phase development? 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.
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Nov 11 2015, 11:29 AM
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#75
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
New paper and ESA Blog post:
The ups and downs of a comet’s surface http://blogs.esa.int/rosetta/2015/11/11/th...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-Mis...-Geomorphology/ The first image is " The Geomorphology of the Agilkia landing site" http://univ.smugmug.com/Rosetta-Philae-Mis...semap_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-Mis...ap--annot-L.png Landing Site Map http://univ.smugmug.com/Rosetta-Philae-Mis...ding_site-L.png Effusive Deposits http://univ.smugmug.com/Rosetta-Philae-Mis.../effusive-L.png Scree Deposits http://univ.smugmug.com/Rosetta-Philae-Mis...0/L/scree-L.png Plumed Deposits http://univ.smugmug.com/Rosetta-Philae-Mis.../L/plumed-L.png Pitted Terrain http://univ.smugmug.com/Rosetta-Philae-Mis.../L/pitted-L.png Deflated Terrain http://univ.smugmug.com/Rosetta-Philae-Mis...L/deflate-L.png --Bill -------------------- |
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Nov 12 2015, 03:47 PM
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#76
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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/th...comets-surface/ The sound of Philae conducting science http://blogs.esa.int/rosetta/2015/11/12/th...ucting-science/ Reconstructing Philae's flight across the comet http://blogs.esa.int/rosetta/2015/11/12/re...ross-the-comet/ Rosetta and Philae one year since landing on a comet http://blogs.esa.int/rosetta/2015/11/12/ro...ing-on-a-comet/ Video: science highlights one year since comet landing http://blogs.esa.int/rosetta/2015/11/13/vi...-comet-landing/ From one comet landing to another: planning Rosetta's Grand Finale http://blogs.esa.int/rosetta/2015/11/12/fr...s-grand-finale/ Video: science highlights one year since comet landing http://blogs.esa.int/rosetta/2015/11/13/vi...-comet-landing/ CometWatch 12 November – one year on http://blogs.esa.int/rosetta/2015/11/13/co...er-one-year-on/ New Shape Model, more NavCam images to the archives http://blogs.esa.int/rosetta/2015/11/30/ne...et-shape-model/ --Bill -------------------- |
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Dec 11 2015, 07:57 PM
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#77
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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Jan 13 2016, 06:57 PM
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#78
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
new paper in Nature:
Exposed water ice on the nucleus of comet 67P/Churyumov–Gerasimenko |
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Nov 10 2016, 01:17 AM
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#79
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
not sure if this is best thread to post this but here is.. from phys.org with nice simulation movie: Comet 67P/Churyumov-Gerasimenko is much younger than previously thought
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Nov 10 2016, 12:29 PM
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#80
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
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?
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Aug 12 2019, 06:52 PM
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#81
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
A Moon around Chury ? http://www.esa.int/spaceinimages/Images/20...ected_companion
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Oct 28 2020, 05:29 PM
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#82
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Mystery of the second touchdown finally solved (with images and video):
https://www.dlr.de/content/en/articles/news...cino-froth.html |
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