Autor Thema: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada  (Gelesen 48782 mal)

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #240 am: Dezember 02, 2012, 09:59:52 vorm. »
Hier sind noch einmal alle Aufnahmen von SM # 73 in einem Film:

http://www.youtube.com/watch?v=MIlPPAqrnvY

Zitat
X-ray CT of select locations of Sutter's Mill SM73 carbonaceous chondrite with high resolutions between 1.6 to 4 micron/voxel, showing details of local mineralogy.

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #241 am: Dezember 20, 2012, 20:49:28 nachm. »
Eine Zusammenfassung der bisherigen Analyseergebnisse zu Sutter's Mill soll offensichtlich morgen in der Zeitschrift Science veröffentlicht werden.

P. Jenniskens et al. Radar-enabled recovery of the Sutter’s Mill meteorite, a carbonaceous chondrite regolith breccia. Science. Vol. 338, December 21, 2012, p. 1583. doi:10.1126/science.1227163.

http://www.space.com/18995-sutters-mill-california-meteorite.html

Zitat
This is where history begins to blur. The weathering of the meteorite fragments suggested the space rock was only 50,000 to 90,000 years old when it hit Earth — basically a blink of an eye in the solar system's nearly-5-billion-year history. This is fortunate, as Jenniskens' team discovered carbonaceous chondrites are fragile and begin to break up around that time frame.[...] "This thing is diverse, even on a small scale,"

http://www.sciencenews.org/view/generic/id/347199/description/California_meteorite_a_scientific_gold_mine

Zitat
Its trajectory shows it was traveling on a very unusual, stretched-out orbit. Only one other space rock, which fell in 2009 in Denmark, has been seen following a similar path. Both may trace back to a family of asteroids called Eulalia, which orbit the sun in the asteroid belt between Mars and Jupiter, circling three times for every one time Jupiter orbits. On a close pass, Jupiter’s gravity may have kicked Sutter’s Mill on a path to hit Earth, Jenniskens says.[...] The rock’s beat-up nature suggests that many of the Eulalia asteroids may have suffered more than previously thought. More answers may be coming soon; some properties of the Sutter’s Mill meteorite, like how it reflects light, are similar to the carbonaceous asteroid that Japan’s Hayabusa-2 spacecraft plans to visit in 2018.

http://www.newscientist.com/article/dn23023-vansized-space-rock-is-a-cosmic-oddball.html

Zitat
But in three rocks collected before a heavy rainstorm, which bathed the other pieces in earthly contaminants, organics are less abundant by a factor of 1000 than in previously studied CM chondrites.

These three rocks could not have lost organics due to space "weathering": analysis of the meteorites' exposure to cosmic rays suggests the original meteor was flying through space for only about 50,000 years before hitting Earth.

Based on its trajectory and its relatively short flight time, Jenniskens thinks the meteor can be traced back to a family of asteroids dominated by 495 Eulalia, a group known as a possible source of CM chondrites. It is probably a piece that broke off during an impact, revealing the relatively pristine material inside.

So what happened to its organics? Jenniskens' team found that the meteorites are breccia – smaller rocks cemented together – which suggests that the asteroid from which they came took a series of beatings. Those impacts, or possibly other processes inside the asteroid, could have heated it enough to destroy most organic material. The result might have implications for the organics delivery theory, says Bill Bottke of the Southwest Research Institute in Boulder, Colorado.

"It shows that not all asteroids can deliver sufficient quantities. One of the disappointments is that, from a prebiotic organic chemistry perspective, it was very limited," says Bottke. "But this is an unusual case. Most [CM chondrites] are loaded with organic compounds."

http://www.eurekalert.org/pub_releases/2012-12/amon-nms122012.php

Zitat
Analyses performed using different techniques at other institutions were in agreement: the mineralogy and other geochemical features of these fragments are unexpectedly diverse and complex. This suggests that the surface of the asteroid that spawned the CM chondrites, their "parent body," is more complex than previously thought.

http://www.seti.org/node/1542

Zitat
"Amino acids were few in this meteorite because this particular meteorite appears to have been slightly heated in space before it arrived at Earth," said Danny Glavin of NASA’s Goddard Space Flight Center, Greenbelt, Md.

It appears that different parts of the meteorite had a different thermal alteration history. Heating also removed some of the water that used to move salts around in the asteroid.

"Samples collected before it rained on the meteorite fall area still contained such salts," said George Cooper of NASA Ames, "but Sutter's Mill was less altered by water in the asteroid itself than other CM type meteorites."

"Only 150 parts per billion of Sutter's Mill was actual gold," said co-author and cosmochemist Qing-zhu Yin of U.C. Davis, Davis, Calif., "but all of it was scientific gold. With 78 other elements measured, Sutter's Mill provides one of the most complete records of elemental compositions documented for such primitive meteorites."
« Letzte Änderung: Dezember 20, 2012, 21:25:23 nachm. von karmaka »

Offline Murchison´s friend

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #242 am: Dezember 20, 2012, 21:09:08 nachm. »
Lieber Sherlock,

danke für den super Bericht.
Es sind übrigens nicht 77 Teile, es sind "nur" 76, den eines hab ich (juhu) !

Deine unübertreffliche Spürnase wird sicher mal in die Geschichte eingehen.

Dein treu ergebener
Watson
Murchison`s friend ist für alles Neue offen - besonders um Meteorite zu finden !

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #243 am: Dezember 20, 2012, 21:29:30 nachm. »
Hier ist noch der Vortrag von Jenniskens vom 13.6.2012:

http://www.youtube.com/watch?v=zcSXmCrXbUo&feature=player_embedded#!


Wer will kann heute übrigens ab 22:00 Uhr eine halbe Stunde auf google+ mit Peter im Video-Chat 'herumhängen':

Chat with Jenniskens at 1pm PST today, 12-20-2012

Dr. Jenniskens will be doing a live video chat today from 1 - 1:30 pm, PST. To hear more about this meteoric discovery and ask questions, visit the Google+ Hangout event page at https://plus.google.com/events/cehbi736jeaa3jlojht76ec73rc

Alex Witze from Science News will interview Peter Jenniskens (SETI Institute), Derek SEARS (NASA), and Franck Marchis (SETI Institute)

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #244 am: Dezember 20, 2012, 22:53:17 nachm. »
Hier ein paar Daten bei Eintritt in die Erdatmosphäre:

Geschwindigkeit: 28,6 km/s
Gewicht: 40000 kg
Größe: 3 Meter im Durchmesser

CRE-age: 50000-90000

Auch der berechnete 'kometenähnliche Orbit' und seine Ähnlichkeit zum MARIBO-Orbit ist sehr interessant.

Ein gemeinsamer heterogener parent body wir angenommen.

Die Heterogenität von Sutter's Mill zeigt sich auch in den Klasten.


Offline Chondrit 83

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #245 am: Dezember 20, 2012, 23:03:03 nachm. »
Hi Martin,

40 Tonnen wow  :wow:

Mit einem Gibeon hats begonnen....

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #246 am: Dezember 20, 2012, 23:14:59 nachm. »
Radar-Enabled Recovery of the Sutter’s Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia

http://www.sciencemag.org/content/338/6114/1583.full  

Zitat
Doppler weather radar imaging enabled the rapid recovery of the Sutter’s Mill meteorite after a rare 4-kiloton of TNT–equivalent asteroid impact over the foothills of the Sierra Nevada in northern California. The recovered meteorites survived a record high-speed entry of 28.6 kilometers per second from an orbit close to that of Jupiter-family comets (Tisserand’s parameter = 2.8 ± 0.3). Sutter’s Mill is a regolith breccia composed of CM (Mighei)–type carbonaceous chondrite and highly reduced xenolithic materials. It exhibits considerable diversity of mineralogy, petrography, and isotope and organic chemistry, resulting from a complex formation history of the parent body surface. That diversity is quickly masked by alteration once in the terrestrial environment but will need to be considered when samples returned by missions to C-class asteroids are interpreted.

http://www.sciencemag.org/content/338/6114/1521.full

http://www.sciencemag.org/content/338/6114/1508.1.full.pdf

:platt:

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #247 am: Dezember 20, 2012, 23:46:27 nachm. »
Mir haben Derek Sears' letzten Bemerkungen auch ganz gut gefallen.

Hier ist mein Transkript:

"It was a meteorite dealer who actually picked up the first piece and that dealer was more than willing to share his information with Peter. [...] The lesson I've come away with is you had a hundred or so people in the field, you had researchers, you had meteorite dealers, you had members of the public, you had the state park's people and the degree of collaboration and enthusiasm amongst a hundred people ... they had one thing in common ... they were passionate about finding meteorites, some of them were gonna get money as well, some were gonna get other sorts of rewards but the point is, what Sutter's Mill demonstrated to me was how these very diverse people can come together and produce incredible results despite having come at the problem from very different directions. There is an innate passion for rocks from space that was a privilege to watch."
Quelle: https://www.youtube.com/watch?feature=player_embedded&v=yj1MvKFhKeU

 :super:


Die supplementary materials (74 Seiten) mit vielen interessanten Informationen, Bildern und Grafiken sind glücklicherweise verfügbar:

http://www.sciencemag.org/content/suppl/2012/12/19/338.6114.1583.DC1/Jenniskens.SM.pdf
« Letzte Änderung: Dezember 21, 2012, 00:29:07 vorm. von karmaka »

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #248 am: Dezember 21, 2012, 08:03:36 vorm. »
Sutter's Mill Meteorite Sample 51 im Scan

http://www.youtube.com/watch?v=kjkHLeZUJq4

Und noch ein Interview aus der Sendung All things considered von NPR (20.12.2012)

MP3: http://pd.npr.org/anon.npr-mp3/npr/atc/2012/12/20121220_atc_07.mp3?dl=1

Das Transkript der Sendung zum Mitlesen:
 http://www.npr.org/templates/transcript/transcript.php?storyId=167727215
« Letzte Änderung: Dezember 21, 2012, 08:59:33 vorm. von karmaka »

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #249 am: Dezember 21, 2012, 10:10:52 vorm. »

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #250 am: Dezember 22, 2012, 21:01:10 nachm. »
Hier sind noch neue sehr beeindruckende CT-Aufnahmen von Sutter's Mill:

Sutter's Mill - SM54 Neutron CT

http://www.youtube.com/watch?v=3PLNLaJelZs

Sutter's Mill - SM73 Whole Rock

http://www.youtube.com/watch?v=uhHZ0jFREXE

Hintergrundinformationen: http://doc-ok.org/?cat=78

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #251 am: Januar 03, 2013, 12:10:25 nachm. »
Nun also noch die fusion crust als Animation aus Mikroskopbildern:

SM 73:
http://www.youtube.com/watch?v=wzEN3XSDtw4

SM 32:
http://www.youtube.com/watch?v=otjTa_ZCUvw

Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #252 am: Januar 09, 2013, 23:49:46 nachm. »
Hier ist nun das paper GRATIS zu lesen  :smile::

Radar-Enabled Recovery of the Sutter’s Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia  :super:

Science 21 December 2012: Vol. 338 no. 6114 pp. 1583-1587DOI:10.1126/science.1227163

http://cams.seti.org/Science-Manuscript-SM.pdf

Und auch noch ein anderer Link zu den Supplementary materials:

http://cams.seti.org/Science-SOM-SM.pdf


Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #253 am: Januar 10, 2013, 17:57:59 nachm. »
Sutter's Mill Meteorite Sample 73
noch einmal im X-ray-CT in HD-Auflösung


Zitat
This is a color rendering of the interior structure of the SM73 meteorite sample. The X-ray CT was performed at Center for Molecular and Genomic Imaging at UC Davis by Doug Rowland for Prof. Qing-zhu Yin with Xradia MicroXCT-200. Image resolution: 22.57 micron/voxel, 1024x1024x1024. QZY thanks Robinson family for making this specimen available for scientific research.


Offline karmaka

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Re: Sutter's Mill - 22.04.2012 - Bolide über USA California/Nevada
« Antwort #254 am: Januar 12, 2013, 13:29:40 nachm. »
Hier nochmals eine kleine zusammenfassende akustische Nachlese:

Finding a Shooting Star

Ein Interview mit Dr. Peter Brown, Western University London (Ontario)


Quirks and Quarks, CBC, Canada (12.1.2013)

stream: http://www.cbc.ca/player/Radio/Quirks+and+Quarks/ID/2324851464/

download: http://cbc.ca/quirks/media/2012-2013/qq-2013-01-12_02.mp3

Zitat
Dr. Peter Brown, from the Centre for Planetary Science and Exploration and the Department of Physics and Astronomy at Western University London [Ontario], was part of the team that analyzed and tracked the object.
« Letzte Änderung: Januar 12, 2013, 13:48:22 nachm. von karmaka »

 

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