We just had a relatively(!) minor earthquake here in Maui -- epicenter about 20
miles from me, a 4.6 or .7 Nothing but a rumble and a lot of startled patrons
and library staff.
Shaken but not stirred,
Tracy Latimer
_
Exactly.
Chris
*
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
- Original Message -
From: "Patrick Wiggins"
To:
Sent: Tuesday, November 23, 2010 9:04 PM
Subject: [meteorite-list] Ram pressure question
Hi all,
Could someo
Hi all,
Could someone please explain what "ram pressure" is?
Has it got something to do with when air is compressed it heats up so when a
meteor passes through the atmosphere it compresses the air in front of it
causing the air's temperature to rise and it's that heat that ablates all but
the
Thank You!
If you are really interested by Microprobe, take the time to look at all
the PDF files attached to my article. They are great, I just didn't have
enough space.
All the pictures you see on my Thin-Sections page were taken by John
Kashuba, who also writes for Meteorite-Magazine and Met
Hi Michael,
Another awesome RFSPoD, thank you!
Patrick
Scientific Lifestyle
> Date: Tue, 23 Nov 2010 17:33:30 -0800
> From: mich...@rocksfromspace.org
> To: meteorite-list@meteoritecentral.com
> Subject: [meteorite-list] Rocks from Space Picture of Day
http://www.rocksfromspace.org/November_24_2010.html
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Hello E.P. All,
We do not have examples of anything that even remotely resembles what
actually constitutes cometary material.
What follows is an excerpt from an email that I posted to the list on
August 11th of this year that addresses the same subject.
---
The simple answer is no. No meteorites h
Hi Chris,
True, but the nose can suffer olfactory fatigue with sulfur compounds such
as hydrogen sulfide (after a few minutes you can't smell it anymore although
it's still there - very dangerous, since the warning property of odor
disappears).
Mark
Mark Grossman
Briarcliff Manor, NY
-
Hey Tom and list!
Sorry for all the miss-spelled words!
like "Top Phillips".ment Tom,
I find myself lately trying to type faster then my pay-grade! ..LOL
you all take care!
dave
- Original Message
From: Dave Myers
To: Meteorite-list@meteoritecentral.com
Sent: Tue, Novem
Count...I'd advise the student to monitor/control his diet before taking
this endeavor to the full degree you suggest. :)
- Original Message -
From: "Count Deiro"
To: "Piper R.W. Hollier" ; "Mark Grossman"
;
Sent: Tuesday, November 23, 2010 1:32 PM
Subject: Re: [meteorite-list] su
Hi Larry -
And when I started on this list there were no major differentiated parent
bodies for other meteorites (following McSween), and now we have what, at least
five?
I suppose that if we knew what comets were, then there wouldn't be any need to
spend any money finding out what they are.
Actually I use my nose. Cheaper and always with me .
Chris Spratt
Victoria, BC
(Via my iPhone)
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Hi Anne,
Thank you so much for the links!
The article you written is outstanding! about the microprob lab. I have been
searching for a article like that for a long time. And cannot wait to go
through
all your thin section photos you have for sale! I looked at a few photos and
they are sup
http://science.nasa.gov/science-news/science-at-nasa/2010/23nov_aliencomets/
The Sun Steals Comets from Other Stars
NASA Science News
Nov. 23, 2010: The next time you thrill at the sight of a comet
blazing across the night sky, consider this: it's a stolen pleasure.
You're enjoying the s
Hi Count,
For a meteorite with a sulfur-like odor, the experiment would be fairly
straightforward for a well-equipped lab.
Take the meteorite with a sulfur-like odor, place a piece or some powder
into a glass vial fitted with a rubber septum, and then take a syringe and
draw out some of the
Heating is due to ram pressure for bodies larger than a few millimeters. For
very small particles, ram pressure is not a factor because of the large
distance between air molecules compared with the cross-sectional area. These
small particles do heat up as the result of collisions with molecules,
Tagish Lake is a very friable meteorite, which is postulated to come
from the asteroid belt.
See:
http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1776.pdf
Chris. Spratt
Victoria, BC
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Hi:
I have said this to you before that there is about zero evidence that
carbonaceous chondrites are from comets. There is only minimal evidence
that there are hydrated silicates in comets and at least the CI and CM CCs
very much aqueously altered and are consistent with an origin from C, B,
and
Hello Dave,
Interesting question.
I am not a scientist, but because I sell a lot of thin-sections, I deal
with many scientists, and very often, and I am told that Tom's pictures are
very pretty but often at a much too high a magnification, so crystallization
patterns, among others things, beco
Hello Piper, Mark and Listees,
I suggest that a well received and valuable scientific experiment for some
energetic young graduate student, or doctorial candidate, would be to undertake
the study of heating a suitable meteoritic specimen to the temperature
encountered in atmospheric entry and r
Hi all -
A big thanks to whoever posted the Native American meteorite paper pdf.
Looking for some images, I found:
http://torrivent.blogspot.com/2009_11_01_archive.html
enjoy,
E.P. Grondine
Man and Impact in the Americas
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I was under the impression that it's a myth that direct friction from O and
N molecules on the surface of a meteorite create the heat that causes
ablation. I thought that ram pressure in front of the meteorite was the
main factor in generating heat. The KE and PE would create a hot shock
laye
Hi List,
I list I have a question about thinn section photos, Like the great photos Top
Phillips takes.
Those who study meteorite or classify them, Can they tell just by looking at
the photos, if
the thenn section is from a meteorite?? Can they tell if it is a Lunar or
Martian meteorite from
Sterling- I think you underestimate the effect of convective heat transfer
during cold flight. A fist-sized meteorite might fall for a good three to
five minutes through -40°C air, at around 100 m/s. That is long enough for
the entire stone to equilibrate to that temperature. In the last minute
Hello Everyone,
I just received a special delivery from UPS todayand let me tell you,
this is some of the most beautiful material out there! I sent Marlin Cilz a
large block of the Alamo Impact Breccia to make a few cuts and polish them
up. No words can describe these so here are a few ima
Hi Piper,
Interesting points. I have not seen the original Sears article myself, but
Marvin mentions that Sears thought that meteorites contain too little
troilite to generate the sufurous odor. No mention of other sufur compounds
though.
On the other hand, I know from my chemical safety a
Some points for the debate:
The rapid flight through the atmosphere is very brief --
1-2 seconds. This is not much time to change the
temperature of the stone.
The rate at which the friction-generated heat is
transferred to the interior of the stone is determined
by the thermal conductivity of t
Hello Mark and list,
Reports of some meteorites having a sulphurous smell have been of
interest to me for several years now. My thanks to Mark Grossman for
the mention of the Sears article (1974) and Ursula Marvin's
speculations on the subject (2007). I've not seen either reference
yet and am
Hi Larry,
>> is it possible that a burn is due to something very cold rather than hot?
Absolutely! There's the trick with the old clothes iron. Stick it in the
freezer for a couple hours, take it out and tell someone to touch it.
They'll say it is HOT! Of course, this is the perception of how the
> Elizabeth,
> I will bow to your authority on dog poop but, I was just asking about the
> degree of certainty NASA had about the water ice, CO2 and H2O. .
> I had no idea you would stoop to throwing the work done by the Johnson Space
> center under the bus. This work lead to the discovery of a
Hi all -
Thanks Bernd for the citations. I suppose Steve and Geoff did not recover any
organic remains from Brenham which might allow carbon dates, but then my guess
is even if they had the dates would have been far too young due to neutron
release in impact.
Right now I am particularly inte
Hello Elizabeth, all -
The general informal consensus within the meteorite community has been that
carbonaceous meteorites are cometary in origin. That being the case, a few
questions:
1) At what compression/temperature will CO2 dissociate into Carbon and Oxygen?
2) Will Epoxi provide fine spec
>>Could the black fusion crust formed at the time of ablation absorb the
sun's radiative heat during the dark flight fall? Or provide some form of
insulating benefit?<<
Maybe...but I'd think that the air it has to pass thru during this period
would be quite cold and its passing thru would
A dark crust certainly will absorb energy from the Sun during the fall. But
that radiative energy gain is going to be a lot smaller than the convective
loss from a stream of -40° air blowing across the stone at 100 m/s or so!
I'd think a smooth fusion crust would actually provide better heat tr
Herr Professor and List,
Could the black fusion crust formed at the time of ablation absorb the sun's
radiative heat during the dark flight fall? Or provide some form of insulating
benefit?
Count Deiro
IMCA 3536
-Original Message-
>From: lebof...@lpl.arizona.edu
>Sent: Nov 23, 2010 9:
taking any reasonable offer on my 6.6 g claxton slice
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http://www.jpl.nasa.gov/news/news.cfm?release=2010-390
NASA Spacecraft Burns for Another Comet Flyby
Jet Propulsion Laboratory
November 22, 2010
PASADENA, Calif. -- Eighty-six days out from its appointment with a
comet, NASA's Stardust spacecraft fired its thrusters to help refine
its flight
I recall the Navarro house hammering stone of Park Forest reported as being
almost too hot to touch. I believe her name was Toby Navarro but I may be
wrong. She was actually working at her computer when the stone crashed through
the roof, smashed a computer and hit a game box. She picked it u
I recall an objective, quantified study of temperature history in meteorites
which proved something about the hot/cold debate and internal temperatures.
One
of the Martians ( Zagami?) was studied for "magnetic domain orientation" in
that
the evidence of a martian paleo-magnetic field might ha
Hi,
Ursula Marvin has attributed many of the reports of hot stones with a
sulphurous smell to a "fire and brimstone" expectation on the part of the
observers, especially for the older historic falls. She notes that the
reports of hot stones still exist - primarily due to what observers think
Hi Mike:
I am still a fan of cold meteorites (yes I am biased), so is it possible
that a burn is due to something very cold rather than hot?
Larry
> I have a couple to add to Bernd's list. Both were picked up immediately
> after the fall:
>
> 23) Lixna: Two other workers who were harrowing a nea
I have a couple to add to Bernd's list. Both were picked up immediately
after the fall:
23) Lixna: Two other workers who were harrowing a nearby field near the
village of Lasdany saw another object covered in earth, which had impacted
the ground only 20 steps away. One of the men touched the stone
Dear List Members,
I have 54 auctions ending today, all started at just 99 cents with no reserve.
I also have 50 auctions with make offer option enabled that are due to end
Sunday, November 28th early in the morning. Now is a great opportunity to make
an offer on some of these before they are
I'm not saying that every report is untrustworthy, nor am I saying there
aren't a wide range of actual temperatures. I'm just saying that witness
reports are almost always the least reliable source of accurate information,
and should therefore always be viewed skeptically. Given a long list of
Original Message processed by Tobit InfoCenter
Subject: WANTED: Lot of Canyon Diablo (23-Nov-2010 15:56)
From:metopas...@gmx.de
To: bernd.pa...@paulinet.de
Forwarding this for Ingo whose posts don't make it to the List!
--
Hi Li
I'd be very cautious with reports of perceived meteorite temperatures. How
we feel temperature depends on many factors- the actual temperature of the
object, of course, but also the temperature of our skin, the ambient air
temperature, and perhaps most important, the thermal conductivity of the
Dear Friends,
Where might I find listing of observed fireballs / bolides
for the southeastern United States? I am looking for
fireballs / bolides that have been reported / observed
within the states of Alabama, Mississippi, and Louisiana
for the months of September and October of 2010.
Any su
I wish I could have met Paul when I lived in Louisiana, instead of a
bunch of people who thought the Earth was only 3000 years old and man
walked with dinosaurs.
Great job on the discovery. Now let's wish him luck in convincing his
backwards neighbors that a meteorite made the hole and not an ang
Greetings listees,
ahhh the hot/cold debate rears it's head again. I appreciate Bernd's
list of falls that seem to indicate warm more so than cold but there
are many factors to consider when compiling data. In Bernd's list, how
many of these warm specimens were observed by laymen?? Often there
Larry wrote:
"I wish I could find the old Lost City fall picture of the meteorite
in snow. I do not remember seeing any melted snow around it, but it
must have been warm enough to attract a dog."
Hello Larry and List,
E.L. Fireman, Smithsonian Astrophysical Observatory - Sky & Telescope,
March
Thanks Bernd.
From your data we have as score:
"warm": 14 versus "hot": 8
I believe this can be completed by browsing through other archives or
accounts of some recent witnessed falls ?
Are there data reporting "cold, frozen or alike" meteorites ?
Take care,
Zelimir
bernd.pa...@paulinet.
Thanks Bernd:
This will help a lot!
My guess is that "warm" means warmer than the air temperature, but
probably not much warmer than body temperature since even 15 to 20 degrees
Centigrade (125 to 135 degrees F) is considered hot.
Given that some have been said to be frosty, and one always hears
Thanks so much for sharing this great photo-series of the Henbury crater
area, Patrick. Very impressing indeed. Landscapes do have their own spirit,
and this one seems to be unusually special & strong.
And thank you for your actualization too, Norbert. "Roaming wild camels"
spontaneously evo
Patrick wrote:
"Images from a trip many years ago to Northern
Territory, Australia's Henbury meteor craters:
http://users.wirelessbeehive.com/~paw/HMCAPR88.HTML
Hello Patrick,
Beautiful shots but photo #9 is the one I like best because when
I look at it, I feel the urge to crawl on all fours
Good morning Listees, Listoids, Listers,
Here's a copy of something I posted many years ago (maybe 2004).
Cheers,
Bernd
---
Meteorites - warm or hot to the touch?
01) The Binningup meteorite was recovered within a few minutes
of the fal
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