Re: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010

[Jack Schrader]

Congratulations Greg!  Nice find by a great meteorite hunterkeep up the 
good 
work!  All the best, Jack



- Original Message 
From: Michael Johnson 
To: meteorite-list@meteoritecentral.com
Sent: Wed, October 27, 2010 7:10:33 PM
Subject: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010

http://www.rocksfromspace.org/October_28_2010.html
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Re: [meteorite-list] Well, it's official Yelland Dry lake Bed

[Greg Hupe]

Hi Sonny,

Congratulations on the Official Naming of Yelland Dry Lake! You are  
one persistant hunter and it has clearly paid off. Too bad our  
schedules didn't mesh while I was in southern Nevada and California  
the last few weeks, always next time. I was a little lucky again on my  
last day of hunting, more on that later...


Again, Congrats on making Yelland Official!

Best Regards,
Greg Hupe

On Oct 27, 2010, at 9:26 AM, wahlpe...@aol.com wrote:


Hi List,


I just wanted to share the news that Yelland Dry Lake has been  
approved as the official name for the meteorites I discovered in  
2007. This is the largest known TKW of chondritic material recovered  
from one meteorite here in Nevada. The TKW is 76 kg's, it is  
classified as an H4. This is the lake bed where the Meteorite Men  
episode was filmed last year. I revisited the lake last month with a  
couple of friends and recovered  several  more pieces.
I have noticed over the past few months that a few list members have  
recovered up to 5 more kilo's from the same lake bed.  Way to go  
guys, keep up the good work! It would be nice to see many people  
enjoy this area as the many that have been able to enjoy Gold Basin  
( Thanks to Jim, John and Twink).


I received an email early last year from a certain list member that  
indicated this lake bed was located by Strawberry Point near Eureka  
Nv.,  with  other inaccurate information.  This lake bed is actually  
closer to Ely, Nevada and is in an area that I have spent many years  
exploring. Hopefully someday he will find his own strewn field and  
will be able to share his exciting news with us all.


Anyone wishing to get additional information about the hunting area   
please contact me off list.


Happy Hunting!

Sonny

http://tin.er.usgs.gov/meteor/metbull.php?sea=&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=7&pnt=Normal%20table&code=52641
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[meteorite-list] pyroclastic density currents: Rich Murray 2010.10.27

[Rich Murray]

pyroclastic density currents: Rich Murray 2010.10.27
http://rmforall.blogspot.com/2010_10_01_archive.htm
Wednesday, October 27, 2010
[ at end of each long page, click on Older Posts ]
http://groups.yahoo.com/group/astrodeep/message/74
[you may have to Copy and Paste URLs into your browser]
___


Mark Boslough's supercomputer simulations in 2005 at Sandia National Lab 
proved that the momentum of a meteor arriving at an angle at speeds of about 
30 km/s causes the air burst a few kilometers high to produce an 
incandescent plasma jet, not the spherical fireball of a bomb explosion:


"...Even then -- and this is the chief difference between Boslough's and 
Crawford's simulation and previous ones -- the fireball continues speeding 
towards the ground, driving a massive shockwave before it.
At this point the fireball is moving much slower than the asteroid had been 
prior to the explosion, but it is still traveling at supersonic speeds.
And it is the fireball and its accompanying shockwave, say the article's 
authors, not the initial bomb-like explosion, which cause most of the damage 
on the ground"



http://74.125.155.132/scholar?q=cache:YY6MFUns_CkJ:scholar.google.com/+%22Mark+B\
oslough%22,+impacts&hl=en&as_sdt=100
[ Extracts ]

"..Recent work by Dr. Mark Boslough 4 shows that the impact physics of 
NEOs in the 30-100 meter range has been misunderstood due to a process he 
calls a Low-Altitude Airburst (LAA), which is a newly recognized threat 
regime that has been previously underestimated.
In an LAA event the main body of the NEO comes apart at high altitudes (~80 
km to ~10 km), but the object's mass and kinetic energy are conserved as a 
fast moving, loosely aggregated, collection of particles which entrain a 
column of air reaching the ground in what might be termed an "air hammer."
Dr. Boslough's work shows that the "air hammer" from NEOs as small as 30 
meters inflicts significant damage, as was seen in the 30-meter-class

Tunguska event.
Dr. Boslough has also shown that an LAA from a ~100 meter diameter NEO 
melted sand into glass across a region about 10 km in diameter during Libyan 
Desert Glass impact ~35 million years ago.
During this event the LAA's fireball settled onto parts of Egypt and Libya 
for about a minute with temperatures approaching 5,000K.

Its hypersonic blast wave extended radially for about 100 kilometers"


I haven't yet found detailed public information about temperatures, 
pressures, and durations of the complex turbulent blast jet on the surface.


Many physicists could probably calculate useful first order estimates and 
write software simulations that would give valuable information, enough to 
estimate the area and depth of geoablation of the ground, and the transport 
of ejecta in all directions.


Including angular momentum from the spin of the meteor would require some 
specialized working experience in using hydrodynamic codes, such as for 
tornados and hurricanes.


Existing studies of debris laden tsunamis, underwater turbidity currents, 
and volcanic pyroclastic density currents are very suggestive:


http://en.wikipedia.org/wiki/Pyroclastic_flow

"A pyroclastic flow (also known scientifically as a pyroclastic density 
current[1]) is a fast-moving current of extremely hot gas (which can reach 
temperatures of about 1,000 °C (1,830 °F)) and rock (collectively known as 
tephra), which travel away from the volcano at speeds generally as great as 
700 km/h (450 mph).[2]
The flows normally hug the ground and travel downhill, or spread laterally 
under gravity.
Their speed depends upon the density of the current, the volcanic output 
rate, and the gradient of the slope...


Pyroclastic flows that contain a much higher proportion of gas to rock are 
known as "fully dilute pyroclastic density currents" or pyroclastic surges.
The lower density sometimes allows them to flow over higher topographic 
features such as ridges and hills


"Volumes range from a few hundred cubic meters to more than a thousand cubic 
kilometres.
The larger ones can travel for hundreds of kilometres, although none on that 
scale have occurred for several hundred thousand years.
Most pyroclastic flows are around one to ten cubic kilometres and travel for 
several kilometres.
Flows usually consist of two parts: the basal flow hugs the ground and 
contains larger, coarse boulders and rock fragments, while an extremely hot 
ash plume lofts above it because of the turbulence between the flow and the 
overlying air, admixes and heats cold atmospheric air causing expansion and 
convection. [5]...


Testimonial evidence from the 1883 eruption of Krakatoa (see the article), 
supported by experimental evidence,[8]shows that pyroclastic flows can cross 
significant bodies of water.

One flow reached the Sumatran coast as much as 48 km (30 mi) away. [9]..."

http://www.geo.mtu.edu/volcanoes/hazards/primer/pyro.html

"Pyroclastic flows are f

Re: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010

[dave carothers]

A very nice find.  Congratulations, Greg.

Dave

- Original Message - 
From: "Michael Johnson" 

To: 
Sent: Wednesday, October 27, 2010 10:10 PM
Subject: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010



http://www.rocksfromspace.org/October_28_2010.html
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Re: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010

[Sean T. Murray]

Congrats Greg!

- Original Message - 
From: "Michael Johnson" 

To: 
Sent: Wednesday, October 27, 2010 10:10 PM
Subject: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010



http://www.rocksfromspace.org/October_28_2010.html
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Re: [meteorite-list] Rocks from Space Picture of Day - October 28, 2010

[Gary Fujihara]

Very nice!  Congratulations Greg, on your successful hunt and the 20.2g 
chondrite find.

gary

On Oct 27, 2010, at 4:10 PM, Michael Johnson wrote:

> http://www.rocksfromspace.org/October_28_2010.html
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Gary Fujihara
Big Kahuna Meteorites (IMCA#1693)
105 Puhili Place, Hilo, Hawai'i 96720
http://bigkahuna-meteorites.com/
http://shop.ebay.com/fujmon/m.html  
(808) 640-9161

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[meteorite-list] Rocks from Space Picture of Day - October 28, 2010

[Michael Johnson]

http://www.rocksfromspace.org/October_28_2010.html
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[meteorite-list] Meteorite Sculpture Impact On Humanity

[JoshuaTreeMuseum]

Oh!, the Humanity!: Meteorite sculpture on eBay:

http://cgi.ebay.com/Meteorite-Sculpture-Impact-Humanity-/280580516812?pt=Art_Sculpture&hash=item4153e6ebcc


-
Phil Whitmer 


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[meteorite-list] Lecture: NASA's Going To My Comet

[Ron Baalke]

http://www.jpl.nasa.gov/events/lectures_archive.cfm?year=2010&month=11#myComet  
  

NASA's Going to my Comet
Nov. 2, 2010

Back on March 15, 1986, while observing in Siding Spring, Australia,
Hartley discovered the comet that would officially be designated Comet
103P/Hartley2 (Hartley 2). On November 4th, 2010, NASA's EPOXI mission,
the extended mission of the Deep Impact Spacecraft, will capture
close-up images and other data as it flies within 750 kilometers (460
miles) of the comet's nucleus, estimated to be about 1 kilometer (0.6
miles) in diameter.

When the spacecraft reaches its fiery destination, EPOXI Mission team
members, along with Mr.Hartley, will share their excitement with the
public at a live post-encounter media briefing, to be held in the von
Karman Auditorium at NASA's Jet Propulsion Laboratory. The event will
air at 6:30 AM PDT on the NASA television network.

This event follows a celebrated primary mission for Deep Impact, during
which it fired an instrumented projectile at Comet Tempel 1 to excavate
a crater on July 4, 2005. Its extended mission, EPOXI, combines two
objectives -- the Deep Impact Extended Investigation (DIXI), which
focuses on the Hartley 2 flyby, and the Extrasolar Planet Observation
and Characterization (EPOCh), which used one of the spacecraft's
telescopic cameras to search for planets orbiting other stars. In
addition, engineers have used the spacecraft to flight-test new
protocols for space communications.


Speakers: 

Mr. Malcolm Hartley, Comet Discoverer and Astronomer
Mr. Tim Larson, JPL Advanced Concepts Development Manager, formerly Juno
Mission Manager

Location:

Tuesday, Nov. 2, 2010, 7pm (PDT)
The von Karman Auditorium at JPL
4800 Oak Grove Drive
Pasadena, CA
>Directions 

Webcast:

For the webcast on Tuesday at 7 p.m. PST, click here


If you don't have RealPlayer, you can download the free RealPlayer 8
Basic .

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[meteorite-list] enjoy some orionted extravanga

[habibi abdelaziz]

here are some photo

 http://www.flickr.com/photos/azizhabibi


thanks
aziz


  
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[meteorite-list] Scientists Watch for a 'Hartley-id' Meteor Shower

[Ron Baalke]

http://science.nasa.gov/science-news/science-at-nasa/2010/27oct_hartleyids/ 
 

Scientists Watch for a "Hartley-id" Meteor Shower
NASA Science News

Oct. 27, 2010:  This month, Comet Hartley 2 has put on a good show for
backyard astronomers. The comet's vivid green atmosphere and auburn tail
of dust look great through small telescopes, and NASA's Deep
Impact/EPOXI probe is about to return even more dramatic pictures when
it flies past the comet's nucleus on Nov. 4th.

Another kind of show might be in the offing as well. Could this comet
produce a meteor shower?

"Probably not," says Bill Cooke of NASA's Meteoroid Environment Office,
"but the other night we saw something that makes me wonder."

On Oct 16th, a pair of NASA all-sky cameras caught an unusual fireball
streaking across the night sky over Alabama and Georgia. It was bright,
slow, and--here's what made it unusual--strangely similar to a fireball
that passed over eastern Canada less than five hours earlier. The
Canadian fireball was recorded by another set of all-sky cameras
operated by the University of Western Ontario (UWO). Because the
fireballs were recorded by multiple cameras, it was possible to
triangulate their positions and backtrack their orbits before they hit
Earth. This led to a remarkable conclusion:

"The orbits of the two fireballs were very similar," Cooke says. "It's
as if they came from a common parent."

There's a candidate only 11 million miles away: Small but active Comet
Hartley 2 is making one of the closest approaches to Earth of any comet
in centuries. It turns out that the orbits of the two fireballs were not
only similar to one another, but also roughly similar to the orbit of
the comet. Moreover, meteoroids from Comet Hartley would be expected to
hit Earth's atmosphere at a relatively slow speed--just like the two
fireballs did.

Cooke stresses that this could be a coincidence. "Thousands of
meteoroids hit Earth's atmosphere every night. Some of them are bound to
look like 'Hartley-ids' just by pure chance."

Even so, he plans to keep an eye out for more in the nights ahead,
especially on Nov. 2nd and 3rd. That's when a potential Hartley-id
meteor shower would be most intense, according to calculations by meteor
expert Peter Brown of UWO.

The comet was closest to Earth on Oct. 20th, but that's not necessarily
the shower's peak-time. Cooke explains: "The comet has been sputtering
space dust for thousands of years, making a cloud that is much bigger
than the comet itself. Solar radiation pressure and planetary encounters
cause the comet and the dust cloud to diverge—not a lot, but enough to
make the date of the shower different from the date of the comet's
closest approach."

If there is a Hartley-id shower—"that's a big IF," notes Cooke--it would
emanate from the constellation Cygnus the Swan, visible to observers in
the northern hemisphere almost directly overhead after sunset in early
November. Lunar interference should not be a problem. On Nov. 2nd and
3rd, the Moon will be a slender crescent, providing dark skies for a
meteor watch.

"I'll definitely have our cameras turned on," says Cooke. "It's probably
going to be a non-event. On the other hand," he points out, "we might
discover a whole new meteor shower."


Author: Dr. Tony Phillips
Credit: scie...@nasa
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[meteorite-list] Countdown to Comet Flyby Down to Nine Days

[Ron Baalke]

http://www.jpl.nasa.gov/news/news.cfm?release=2010-349  

Countdown to Comet Flyby Down to Nine Days
Jet Propulsion Laboratory
October 26, 2010

PASADENA, Calif. - NASA's EPOXI mission continues to close in on its
target, comet Hartley 2, at a rate of 12.5 kilometers (7.8 miles) per
second. On Nov. 4 at about 10:01 a.m. EDT (7:01 a.m. PDT) the spacecraft
will make its closest approach to the comet at a distance of about 700
kilometers (434 miles). It will be the fifth time that a comet has been
imaged close-up and the first time in history that two comets have been
imaged with the same instruments and same spatial resolution.

"Hartley 2 has already put on a great show with more than a few
surprises for the mission's science team," said EPOXI principal
investigator Mike A'Hearn from the University of Maryland, College Park.
"We expect more of the unexpected during encounter."

Science observations of comet Hartley 2 began on Sept. 5. The imaging
campaign is more than a tantalizing tease of things to come. It is
providing EPOXI's science team the best extended view of a comet in
history during its pass through the inner solar system. The observations
will continue through the encounter phase of the mission.

The hours surrounding comet encounter will be especially challenging for
the mission team as they are commanding a recycled spacecraft that was
not designed for this comet flyby. The spacecraft was designed and
employed successfully for NASA's Deep Impact encounter of comet Tempel 1
back on July 4, 2005. By recycling Deep Impact's already built, tested
and in-flight spacecraft, the EPOXI mission provided savings on the
order of 90% that of a hypothetical mission with similar goals, starting
from the ground up.

"If we were starting from scratch we'd probably move some of the
spacecraft's components to different locations," said Tim Larson,
project manager for the EPOXI mission from NASA's Jet Propulsion
Laboratory in Pasadena, Calif. "But we've developed a creative way to
work with what we have. This spacecraft, and mission team, have logged
3.2 billion miles over the past five years, and we are confident that we
have a successful plan in place to give Hartley 2 a thorough look-see."

The mission's encounter phase begins the evening of Nov. 3, when the
spacecraft is about 18 hours from the time of closest approach to the
comet's nucleus. At that time the spacecraft will stop transmitting
through its large high-gain antenna and reorient itself so its two
visible-light and one infrared imager maintain lock on the comet for the
next 24 hours-plus.

"When the encounter phase begins all images the spacecraft takes will be
stored aboard its two computers," said Larson. "Soon after we fly past
the comet at about 7 a.m. local time, we will be able to re-orient the
spacecraft so that we maintain imaging lock on the comet nucleus while
pointing our big high gain antenna at Earth."

At that point, the spacecraft will begin beaming down its cache of
cometary close-ups while continuing to take new images. It is expected
to take several hours for all the images held aboard spacecraft memory
to be downliked.

"We will be waiting," said A'Hearn. "The images at closest approach
won't get to Earth until many hours after the actual encounter due to
the way we use memory on the spacecraft. We will get some early hints at
how this nucleus differs from that of comet Tempel 1 based on five
images that will get to Earth only about one hour after closest approach."

EPOXI is an extended mission that utilizes the already "in-flight" Deep
Impact spacecraft to explore distinct celestial targets of opportunity.
The name EPOXI itself is a combination of the names for the two extended
mission components: the extrasolar planet observations, called
Extrasolar Planet Observations and Characterization (EPOCh), and the
flyby of comet Hartley 2, called the Deep Impact Extended Investigation
(DIXI). The spacecraft will continue to be referred to as "Deep Impact."

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the EPOXI
mission for NASA's Science Mission Directorate, Washington. The
University of Maryland, College Park, is home to the mission's principal
investigator, Michael A'Hearn. Drake Deming of NASA's Goddard Space
Flight Center, Greenbelt, Md., is the science lead for the mission's
extrasolar planet observations. The spacecraft was built for NASA by
Ball Aerospace & Technologies Corp., Boulder, Colo.

For more information about EPOXI visit http://www.nasa.gov/epoxi or
http://epoxi.umd.edu/.

DC Agle 818-354-0474
Jet Propulsion Laboratory, Pasadena, Calif.
a...@jpl.nasa.gov

Lee Tune 301-405-4679
University of Maryland, College Park
lt...@umd.edu

2010-349

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[meteorite-list] Munich friday-saturday

[Marcin Cimala]

Hi
I will be in Munich from friday to saturday only. I get my thin section in 
case someone want to look.


CU there.

-[ MARCIN CIMALA ]-[ I.M.C.A.#3667 ]-
http://www.Meteoryty.pl marcin(at)meteoryty.pl
http://www.PolandMET.com   marcin(at)polandmet.com
http://www.Gao-Guenie.com  GSM: +48 (793) 567667
[ Member of Polish Meteoritical Society ]



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