Re: [meteorite-list] Terrestrial meteorite

[Rob Matson via Meteorite-list]

Excellent point, Alan. This is also the reason we should not expect to find 
Venusian meteorites on our planet. It’s not so much the dynamics of material 
transfer to Earth from the deeper solar gravity well of Venus – it’s the 
absurdly thick atmosphere those impactites would have to pass through to go 
into a heliocentric, earth-crossing orbit.  --Rob

Sent from Mail for Windows

From: ALAN RUBIN via Meteorite-list
Sent: Wednesday, July 12, 2023 4:57 PM
To: Mark Hammergren
Cc: meteorite-list@meteoritecentral.com; Michael Farmer
Subject: Re: [meteorite-list] Terrestrial meteorite

I discussed the possibility of terrestrial meteorites in Rubin (2015),
Icarus 257, 221-229. Neglecting the effects of the Earth's atmosphere,
it would take five times as much energy to launch a basaltic rock off
the Earth as it would to launch the same mass rock off Mars. Except
for Black Beauty, essentially every shergottite has been severely
shocked during launch off Mars, transforming the crystalline
plagioclase into maskelynite. (A few shergottites with no maskelynite
were shocked-heated even more strongly.) A terrestrial basalt launched
off Earth would be heavily shocked or completely impact melted. This
does not seem to be the case for NWA 13188. I don't think it is
terrestrial.

On Wed, Jul 12, 2023 at 4:36 PM Mark Hammergren via Meteorite-list
 wrote:
>
> Thirty years ago, my thesis advisor, Don Brownlee, and I talked about 
> potential terrestrial meteorites and how their "asteroids" might be 
> identified among the population of near-Earth objects. Unfortunately for me 
> at the time, we decided that any strong identification would rely on details 
> of silicate chemistry that are tough to measure through ground-based remote 
> sensing. But we were certain that such bodies must exist.
>
> On the same subject, the moon will be a great place to search for terrestrial 
> meteorites, and may prove to be the best place to investigate the conditions 
> of early Earth. Heck, we might even find fossils.
>
> On Wed, Jul 12, 2023, 12:27 PM Bob King via Meteorite-list 
>  wrote:
>>
>> Mike,
>>
>> Go to 
>> https://www.researchgate.net/publication/361365963_Northwest_Africa_13188_A_meteorite_from_the_Earth
>> At the top click on the blue bar that says download full text pdf. I just 
>> did it and no fee is required.
>>
>> Bob
>>
>> On Wed, Jul 12, 2023 at 9:12 AM Michael Farmer via Meteorite-list 
>>  wrote:
>>>
>>> Unfortunately paywall
>>>
>>>
>>> Sent from Yahoo Mail for iPhone
>>>
>>> On Wednesday, July 12, 2023, 2:05 AM, Albert Jambon via Meteorite-list 
>>>  wrote:
>>>
>>> There was a presentation at the Goldschmidt Conference in Lyon this week. 
>>> Here is a link
>>>
>>>
>>>
>>> https://www.newscientist.com/article/2381928-meteorite-left-earth-then-landed-back-down-after-round-trip-to-space/
>>>
>>>
>>>
>>> Albert JAMBON
>>>
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>
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-- 
Alan Rubin
Institute of Geophysics and Planetary Physics
Department of Earth, Planetary, and Space Sciences
University of California
3845 Slichter Hall
603 Charles Young Dr. E
Los Angeles, CA  90095-1567
USA

office phone: 310-825-3202
fax: 310-206-3051
e-mail: aeru...@ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
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Re: [meteorite-list] CNEOS1 2014-01-08 hunt in P.N.G. Harvard physicist Avi Loeb is organizing a $1.5 million expedition

[Rob Matson via Meteorite-list]

I’m with you, Mike – what the hell?! This is the stuff of tabloids. If people 
want to find an underwater meteorite, they can search the shore of Lake Ontario 
for the (much larger than sand) fragments of asteroid 2022 WJ1 that impacted 
there November last year, or the western edge of Lake Michigan for the bolide 
that broke up over it 6 years ago on Feb. 6th, 2017, appearing on 5 separate 
Doppler radars. In either case, the water is far, far shallower and the 
prospects better for success than finding anything (natural or artificial) over 
a mile underwater.  --Rob

From: Michael Farmer via Meteorite-list
Sent: Thursday, March 23, 2023 3:33 PM
To: drtanuki; Meteorite-list
Subject: Re: [meteorite-list] CNEOS1 2014-01-08 hunt in P.N.G. Harvardphysicist 
Avi Loeb is organizing a $1.5 million expedition

Good grief. What nonsense. A mile deep. In the pacific  ocean. Particles the 
size of rice. Years under the water…… what a scam 


Sent from Smallbiz Yahoo Mail for iPhone
On Thursday, March 23, 2023, 8:04 AM, drtanuki via Meteorite-list 
 wrote:
https://dnyuz.com/2023/03/23/a-harvard-physicist-is-racing-to-prove-this-meteorite-is-an-alien-probe/

A Harvard Physicist Is Racing to Prove This Meteorite Is an Alien Probe
March 23, 2023

The world’s top alien hunter is about to embark on his most ambitious—and 
potentially history-making—mission yet. Harvard physicist Avi Loeb is 
organizing a $1.5-million expedition to Papua New Guinea to search for 
fragments of a very strange meteorite that impacted just off the coast of the 
Pacific nation in 2014.

There’s compelling evidence that the half-meter-wide meteorite, called CNEOS1 
2014-01-08, traveled from outside our solar system. And that it’s made of 
extremely hard rock or metal—a material that’s hard and tough enough to prove 
the meteorite isn’t a meteorite at all. Maybe it’s an alien probe.

It’s a long-shot effort. After years of work, Loeb and his team have, with a 
big assist from the U.S. military, narrowed down CNEOS1 2014-01-08’s likely 
impact zone to a square kilometer of the ocean floor, nearly two kilometers 
underwater. But the fragments themselves are probably just a few millimeters in 
size. It’s worse than looking for a needle in a haystack. Loeb is basically 
preparing to look for big sand in a square-kilometer patch of small sand. 
more
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Re: [meteorite-list] Small, earth-impacting asteroid/meteoroid videos now showing up online

[Rob Matson via Meteorite-list]

Hi John – yes, being a member of the asteroid monitoring community has its 
advantages as far as timely communication about such events. But the Minor 
Planet Electronic Circulars are out there for anyone to read. Here was the MPEC 
for this impactor:

https://minorplanetcenter.net/mpec/K23/K23CA3.html

Using the astrometry in that MPEC, anyone familiar with Bill Gray’s Find_Orb 
software can reconstruct the asteroid’s trajectory with high precision.
As in the case with Almahata Sitta, meteorites will certainly be recovered from 
this fall – thankfully from a country much easier to get to!  --Rob

Sent from Mail for Windows

From: John Lutzon
Sent: Tuesday, February 14, 2023 1:12 PM
To: Rob Matson
Cc: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Small, earth-impacting asteroid/meteoroid videos 
now showing up online

 
  Ah, to have such knowledge & contacts. Thanks Everyone for keeping us in 
the loop.
  JL
.---  .-..  ---  ..-  -
- Original Message - 
From: Rob Matson via Meteorite-list 
To: meteorite-list@meteoritecentral.com 
Sent: Tuesday, February 14, 2023 12:15 PM
Subject: Re: [meteorite-list] Small, earth-impacting asteroid/meteoroid videos 
now showing up online

Flight direction was azimuth 102, entry angle about 41 degrees from vertical, 
slow entry velocity (~14 km/sec). There are certainly meteorites on the ground 
as this was a 1-1.5 meter, non-cometary body. The altitude was 42 km when it 
crossed the Normandy coastline, and the terminal burst had not yet occurred. 
I’ve already done dark flight modeling of this fall using radiosonde data from 
Herstmonceaux (balloon launched three hours before the fall from about 60 miles 
to the north in the southern UK).   --Rob

Sent from Mail for Windows

From: Chris Peterson via Meteorite-list
Sent: Tuesday, February 14, 2023 7:55 AM
To: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Small,earth-impacting asteroid/meteoroid videos 
now showing up online

It was heading generally eastward over the Channel and was still burning 
when it crossed the French shoreline. It is likely to have dropped 
meteorites on land.

Chris

***
Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com

On 2/14/2023 3:29 AM, Graham Ensor via Meteorite-list wrote:
> It was heading from France and terminated it seems just as it reached the
> channel so likely everything is in the sea if it did drop anything. Not
> seen any predictions that it made landfall in France or the UK. So close
> and yet so far.
> 
> Graham
> 
> On Mon, Feb 13, 2023 at 11:27 PM Darryl Pitt via Meteorite-list <
> meteorite-list@meteoritecentral.com> wrote:
> 
>>
>>
>> Nice!   :-)
>>
>> On Feb 12, 2023, at 11:10 PM, Matson, Rob D. [US-US] via Meteorite-list <
>> meteorite-list@meteoritecentral.com> wrote:
>>
>> A small (~1-meter) asteroid that astronomers have been tracking for
>> several hours earlier today crossed over the English Channel one hour ago
>> (3:00 UT 13 February) and broke up over the coast of Normandy. Many videos
>> of it are already appearing on the web. Here’s one taken from Brighton, UK
>> (south coast of England) looking across the channel toward France:
>>
>> https://twitter.com/KadeFlowers/status/1624967147708420103
>>
>> Should be numerous meteorites on the ground – the meteoroid was at about
>> 40-km altitude at the point it crossed the French coastline north of
>> Saint-Martin-aux-Buneaux, so nearly all of it should be over land.  --Rob
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>>
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> 
> 
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Re: [meteorite-list] Small, earth-impacting asteroid/meteoroid videos now showing up online

[Rob Matson via Meteorite-list]

Flight direction was azimuth 102, entry angle about 41 degrees from vertical, 
slow entry velocity (~14 km/sec). There are certainly meteorites on the ground 
as this was a 1-1.5 meter, non-cometary body. The altitude was 42 km when it 
crossed the Normandy coastline, and the terminal burst had not yet occurred. 
I’ve already done dark flight modeling of this fall using radiosonde data from 
Herstmonceaux (balloon launched three hours before the fall from about 60 miles 
to the north in the southern UK).   --Rob

Sent from Mail for Windows

From: Chris Peterson via Meteorite-list
Sent: Tuesday, February 14, 2023 7:55 AM
To: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Small,earth-impacting asteroid/meteoroid videos 
now showing up online

It was heading generally eastward over the Channel and was still burning 
when it crossed the French shoreline. It is likely to have dropped 
meteorites on land.

Chris

***
Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com

On 2/14/2023 3:29 AM, Graham Ensor via Meteorite-list wrote:
> It was heading from France and terminated it seems just as it reached the
> channel so likely everything is in the sea if it did drop anything. Not
> seen any predictions that it made landfall in France or the UK. So close
> and yet so far.
> 
> Graham
> 
> On Mon, Feb 13, 2023 at 11:27 PM Darryl Pitt via Meteorite-list <
> meteorite-list@meteoritecentral.com> wrote:
> 
>>
>>
>> Nice!   :-)
>>
>> On Feb 12, 2023, at 11:10 PM, Matson, Rob D. [US-US] via Meteorite-list <
>> meteorite-list@meteoritecentral.com> wrote:
>>
>> A small (~1-meter) asteroid that astronomers have been tracking for
>> several hours earlier today crossed over the English Channel one hour ago
>> (3:00 UT 13 February) and broke up over the coast of Normandy. Many videos
>> of it are already appearing on the web. Here’s one taken from Brighton, UK
>> (south coast of England) looking across the channel toward France:
>>
>> https://twitter.com/KadeFlowers/status/1624967147708420103
>>
>> Should be numerous meteorites on the ground – the meteoroid was at about
>> 40-km altitude at the point it crossed the French coastline north of
>> Saint-Martin-aux-Buneaux, so nearly all of it should be over land.  --Rob
>> __
>> Meteorite-list mailing list
>> Meteorite-list@meteoritecentral.com
>> https://pairlist2.pair.net/mailman/listinfo/meteorite-list
>>
>>
>> __
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>>
> 
> 
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Re: [meteorite-list] Nevada Bolide

[Rob Matson via Meteorite-list]

 Yeah, home meth lab was my first guess when I heard the story, lol.  --Rob

Sent from Mail for Windows

From: Michael Farmer via Meteorite-list
Sent: Monday, November 7, 2022 8:16 AM
To: mlbl...@cox.net; Meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Nevada Bolide

It’s a scam. Was a fireball in Northern California. House burned. Not related 
to the meteor event. Just meth heads. 


Sent from Smallbiz Yahoo Mail for iPhone
On Sunday, November 6, 2022, 2:47 AM, mlblood--- via Meteorite-list 
 wrote:
Hi All,

This evening a local San Diego news reported "a meteor" hit and burned a house
in Nevada. They did show a real bolide in the night sky - however, they claimed
it was traced to his house (Did not report WHO traced it to his house).

Anyone know anything about this?

Michael Blood

--
HISTORICAL AMERICAN METEORITE OF OVER 42 KG
Bonhams Natural History auction on Sep 21 offers 50+ lots of stellar planetary 
meteorite specimens, including a superb Canyon Diablo specimen. Browse the 
auction and register to bid online.

Link:  
https://www.bonhams.com/auction/27815/cabinet-of-curiosities-natural-history-entomology-and-minerals/?utm_source=meteroritecentral_medium=banner_campaign=nat-sep-22_id=col-nat-sep-22
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--
HISTORICAL AMERICAN METEORITE OF OVER 42 KG
Bonhams Natural History auction on Sep 21 offers 50+ lots of stellar planetary 
meteorite specimens, including a superb Canyon Diablo specimen. Browse the 
auction and register to bid online.

Link:  
https://www.bonhams.com/auction/27815/cabinet-of-curiosities-natural-history-entomology-and-minerals/?utm_source=meteroritecentral_medium=banner_campaign=nat-sep-22_id=col-nat-sep-22
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Re: [meteorite-list] Hunting Holbrook, Arizona 101 - video

[Rob Matson via Meteorite-list]

Very much enjoyed the Holbrook video, Ruben -- thank you for sharing it! Seems
like forever
since I've been there, but that red soil is still fresh in my mind. You and your
son had a nice
successful day of escaping the Phoenix heat, rescuing a dozen 100+ year-old
earth visitors
from another monsoon shower, and high-tailing it before you got stuck
yourselves. :-)  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Ruben Garcia via Meteorite-list
Sent: Thursday, July 18, 2019 6:19 AM
To: metlist
Subject: [meteorite-list] Hunting Holbrook, Arizona 101 - video

Hi,

Here is a video that we filmed yesterday in Holbrook, Arizona.  It's a
very basic video for those of you that have never hunted Holbrook, or
maybe never hunted anywhere.

We had lots of fun, found 12 small meteorites and as you can see from
the last scene, we did finally get out of the heat.

https://www.mrmeteorite.net/my-meteorite-videos
or Here
https://www.youtube.com/watch?v=Oa2_FRzOO_U

-- 

Rock On!

Ruben Garcia
www.MrMeteorite.net
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[meteorite-list] Viñales Cuba fall

[Rob Matson via Meteorite-list]

Hi All -- the DoD data from the daytime Cuban fall from February 1st is now up
on JPL's website:

https://cneos.jpl.nasa.gov/fireballs/

Fall time: 18:17:10 UT (13:17:10 EST)
Coordinates: 22.5 N, 83.8 W, Alt. 23.7 km
Velocity: 16.3 km/sec
Impact energy: 1.4 kilotons (compare with Chelyabinsk 440 kilotons!)

--Rob

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[meteorite-list] Tucson show event dates

[Rob Matson via Meteorite-list]

Hi All -- haven't seen an announcement about 2017 Tucson dates, but based on 
past patterns
should I assume that the IMCA dinner will be held on Thursday, February 2nd, 
and if there's a
Birthday Bash it will be on Friday the 3rd?  --Rob


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[meteorite-list] Meteorite identification

[Rob Matson via Meteorite-list]

I’m gonna go out on a limb and guess that most list members will find this 
hilarious:

 

http://xkcd.com/1723/

 

J  --Rob

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[meteorite-list] Meteorite identification

[Rob Matson via Meteorite-list]

I’m gonna go out on a limb and guess that most list members will find this 
hilarious:

http://xkcd.com/1723/

:-)  --Rob

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[meteorite-list] More on meteorite temperature

[Rob Matson via Meteorite-list]

Hi All,

Posted this from work over 7 hours ago but seems not to have worked, so
resending from
home...--Rob

- - - -

Hi All,

Playing Devil's Advocate, I decided to try coming up with a scenario that
attempts to maximize the
thermal equilibrium temperature of a chondritic meteoroid just prior to
encountering the earth's
atmosphere. The typical formula for computing the thermal equilibrium
temperature for an
object without an atmosphere is:
 
Te = [S0 * (1-A) / (4*epsilon*sigma)] ^ (1/4)
 
where the body is assumed to be spherical (the source of the 4 in the
denominator), S0 is the
solar constant (mean value 1361 W/m^2), A is the bolometric Bond albedo, epsilon
is the
meteoroid's emissivity, and sigma is the Stefan-Boltzmann constant (5.670 x
10^-8 W/m^2-K^-4).
A, in turn, can be estimated from the following equation:
 
A ~= q * pv
 
where q is the phase integral and pv is the visible albedo. Using Bowell's H, G
magnitude system,
we can compute q from:
 
q = 0.290 + .684*G
 
The commonly used value for the slope parameter, G, is 0.15, in which case:
 
q = 0.393
A = 0.393 * pv
 
For very dark asteroids (e.g. Trojan asteroids, Hildas, Cybeles), the albedo can
be 5% or lower.
However, most NEOs have semi-major axes less than 3 a.u. and albedos averaging
closer
to 20%.
 
The final missing value is the emissivity. For regolith, a range of 0.9-0.95 is
often mentioned.
However, emissivity and albedo work hand-in-hand (epsilon + pv ~= 1). So if
we're going
to choose an emissivity of 0.9, we should set the albedo, pv, to 10%.
 
So what is a typical equilibrium temperature for a spherical NEO with 10%
albedo, 0.9
emissivity, 1 a.u. from the sun?
 
A = .393*10% = .0393
 
Te = [1361 * (1-.0393) / (4*0.9*5.67 x 10^-8)]^0.25 = 282.9 K or about 49.6 F
 
So, cool, but certainly not freezing. How can we get a warmer answer?  One way
is to pick the
time of year when the earth is closest to the sun (early January) and the solar
constant is
higher:  about 1414 W/m^2.  This raises the temperature in the above example to
285.6 K,
or 54.4 F. Still not warm, but warmer. Lowering the emissivity will help, too.
Let the albedo
increase to 20%, and set the emissivity to 0.8. With the perihelion solar
constant, the
equilibrium temperature is now up to 291.1 K (64.3 F). Lowering the emissivity
further
is probably not realistic for most earth-crossing asteroids, so we're at the
limit of what
we can achieve via S0 and emissivity.
 
However, there *is* a way to get a big increase in the equilibrium temperature
which
I'll cover in the next installment.  --Rob


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Re: [meteorite-list] Hot vs. Cold again...

[Rob Matson via Meteorite-list]

Hi Elton,

> Any body arriving from space is at least -60�c and closer to -120�c to -180�c 
> based on
> some black body studies of asteroids-- IIRC

The temperature for a typical earth-crossing asteroid with a chondritic 
composition is
actually likely to be warmer than this -- perhaps -20 C. Depends on how "black" 
the
original meteoroid was. Equilibrium temperatures for irons are quite a bit 
warmer.

> The radiative cooling during dark flight is probably calculable and a missing 
> factor in
> estimating the state of heat content upon landing.

Not just a missing factor -- perhaps the dominant factor. 3-5 seconds of 
ablation is nothing
compared to 2-8 minutes of freefall through atmospheric temperatures as low as
-70 C. Basically you have a frozen, baked Alaska situation:  pre-atmosphere, a 
cold body
through and through. Then (in the case of non-irons), you expose this 
low-thermal-
conductivity mass to a brief blast of extreme heat that boils off the exterior 
almost as
fast as the heat can be conducted to the cold interior. Bur almost as soon as 
it starts, it's
over. You have a thin crust of hot material surrounding the still ice-cold 
interior. And for
the final act, you refreeze the exterior for a time period 20 to 100 times 
longer than
the ablative phase. For stony meteorites, there just isn't enough time to raise 
the
bulk temperature of the body.

So I disagree with this statement:

"An immediately-recovered, newly-fallen silicate/stony meteorite is 
usually--but briefly
"hot/uncomfortably warm" to the touch. The rind is very hot but lacks much heat 
reservoir."

As long as there is an extended period of freefall through the atmosphere (a 
very
reasonable assumption for non-cratering events), atmospheric cooling will 
always win out
for a stony meteorite.  --Rob


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[meteorite-list] Geometry and velocity trump gravity

[Rob Matson via Meteorite-list]

Hi E.P.,

Doug's reply pretty much covers it, but I wanted to give you an example so
that you can see how your intuition is failing you on this problem. Let's take
the case of a slower-than-average asteroid closing velocity encounter of
20 km/sec. And let's say that in the absence of any gravitational attraction
from the earth or the Moon, the asteroid would come no closer than the
altitude of geosynchronous satellites -- 35786 km. (This is a rather close
encounter, I'm sure you'd agree. Any trajectory with a more distant
point of closest approach would obviously experience less trajectory
bending than this case.) If we "turn on" earth's gravity, how much will
the trajectory be diverted toward the earth's center? Without getting into
the calculus of actually solving the problem, let's make some simplifying
assumptions that are very ~generous~ in the amount of gravitational
acceleration we're going to apply.

The acceleration due to gravity at the height of geosync satellites is
around 0.224 m/sec^2. Let's assume that that amount of acceleration is
applied during the entire encounter, and that it is always directed
perpendicular to the asteroid's original velocity vector. Define the start
of the encounter as being when the earth is 45 degrees to the left
of the velocity vector (at range 59629 km -- the square root of 2 times
the distance to the earth's center). The midpoint is when the earth
is 90 degrees to the left of the velocity vector (point of minimum
range to the earth center), and the end is when the earth is 135 degrees
to the left of the velocity vector. To first order, the distance travelled
is 2*42164 km = 84328 km. How long would it take in the absence of
gravity?  84328 km / (20 km/sec) = 4216 seconds -- a little over 70 minutes.
Recall your basic distance equation under constant acceleration:
X = 1/2 * A * T^2. Here we've generously allowed A to be 0.224 m/sec^2
for the entire encounter (when in fact A at the start is only half that).
What does X work out to?

X = 0.5 * 0.224 * (4216)^2 = 1.99 million meters or 1990 km.

Compare that to the 35768 km altitude of the GEO belt, and you see
that the amount of diversion is rather small. So the take-away from
all this is that the outcome is dominated by simple geometry. Yes,
very close encounters with the earth will bend a trajectory -- perhaps
quite significantly, but post-encounter the new trajectory is just as
likely to be diverted toward the Moon as away from it.  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of E.P. Grondine via Meteorite-list
Sent: Sunday, June 26, 2016 9:11 AM
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] What killed off megafauna?

Hi Rob, Doug - 

(Glad to hear that you're doing okay, Doug)  

What both of you need to do is to take the perspective of a potential impactor
passing through the inner solar system,
as seen in the first few seconds of this video:
https://www.youtube.com/watch?v=GDrBIKOR01c

The basic geometry of the problem is set out here:
https://www.youtube.com/watch?v=qTDcfI2dabk

If it makes it easier,
think of the Earth-Moon system as a pair of girls at a darkly lit party, 
and yourself as a young man.
(A variant of the famous mathematical problem of the drunk's walk at the frat
party.)
While you may be attracted to the "prettier" (in terms of gravity/area) Moon,
you are far more likely to run into her much larger "wingman", the Earth.
Sorry, but that is just the way it is.

At first, you're getting a warm fuzzy feeling (gravity) from the combined
Earth/Moon system.
That warm fuzzy feeling varies by the cubes of the radius of each of the two
bodies, 
and is located somewhere amongst them.

On your approach to the Earth/Moon system, you see your landing area (for only
part of the month, see second video) 
in terms of area, which varies by the square of the radius. 
But of course gravity also varies by distance, 
so as you get close to theses two 
you're getting far more of that warm fuzzy feeling from the Earth,rather than
the Moon. 
You head that way. 

You can use any computer language you prefer to model this system, 
and run it on any machine you like.
But as a check on your computer model, you have to rely on the data.
In this case, compare the data on smaller impactors from the Moon, 
(Apollo seismic and optical astronomy)
with the data from the reconnaissance systems which have been operating 
on the Earth since the 1950's, 
and "alarming" the "stuff" out of those looking at the data from them.

If there is a difference between your model's results and the data, then your
model is defective.
 
(An entertaining video on phonetic loading,
the diameters of lunar craters,
typing monkeys, and other natural phenomena:
https://www.youtube.com/watch?v=fCn8zs912OE)

good hunting, 
E.P.

PS - Will NEOcam make meteorite hunting far easier?
Will the increased supply drive down prices even further? 

[meteorite-list] Mount Blanco, TX fall approved by NomComm

[Rob Matson via Meteorite-list]

Hi All,

 

Just noticed that the Mount Blanco (aka Crosbyton, TX) meteorite fall has been

approved by the NomComm:

 


 
=names==yes==contains=50=ge==United+States=name=All=All===0=Normal%20table=63210>

 

--Rob

 

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[meteorite-list] Invented words

[Rob Matson via Meteorite-list]

Ugh. It joins the ranks of "irregardless". Now that social media is a permanent
fixture,
it probably only takes a handful of modestly well-connected people to bastardize
an
existing word into a needless new synonym... I'm becoming a grumpier old man
with
each passing year, I guess!  --R

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Sterling K. Webb via Meteorite-list
Sent: Monday, May 09, 2016 10:33 PM
To: 'Matson, Rob D.'; pmodre...@aol.com
Cc: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Oriented vs Orientated

Rob, 

You bet "desalinization" would 
become one [a word], but the 
world has beaten you to it:

desalinization. (n.d.). The 
American HeritageR New 
Dictionary of Cultural Literacy, 
Third Edition. Retrieved May 09, 
2016 from Dictionary.com: http://www.dictionary.com/browse/desalinization

It's probably too late to stamp
it out...

Sterling
-
-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Matson, Rob D. via Meteorite-list
Sent: Monday, May 09, 2016 8:35 PM
To: pmodre...@aol.com; meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Oriented vs Orientated

A related faux pas: desalinization. No such word, but I bet it will become
one so as not to embarrass the media members who like to use it. ;-). --Rob

From: Meteorite-list [meteorite-list-boun...@meteoritecentral.com] on behalf
of Pete Modreski via Meteorite-list [meteorite-list@meteoritecentral.com]
Sent: Monday, May 09, 2016 10:46 AM
To: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Oriented vs Orientated

My other favorite word that gets used by non-geologists: metamorphosized .
(Do you Brits use that one, by chance?)  I think it fits the rhythym better
in some songs and poems.

Cheers, Pete


-Original Message-
From: howardites via Meteorite-list 
To: meteorite-list 
Sent: Mon, May 9, 2016 11:16 am
Subject: [meteorite-list] Oriented vs Orientated

It certainly got everyone thinking ;-)


If you would like? for the sake of keeping the peace and despite the fact us
Brits widely use orientated I will use oriented.

Just to let you know in advance I use some really bizarre words and if it's
in the English dictionary (UK version) I will use it!

I won't shun you for your choice of words so please don't shun me :-) we are
all different.

Best wishes from across the pond

Xxx




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[meteorite-list] Osceola searches

[Rob Matson via Meteorite-list]

Hi Mike -- best of luck on your next trip out there. For everyone to appreciate
just how hard the searching is there, it would be great if those that have been
could provide an estimate of how many hours they spent. Mexico Doug put in
a LOT of time out there. Obviously so did Larry, Mike, Laura, Josh and Brendan.
Steve Arnold was there at least 2 or 3 days but unfortunately w/o a space rock
for his troubles.

--Rob

-Original Message-
From: Michael Gilmer [mailto:meteoritem...@gmail.com] 
Sent: Saturday, April 02, 2016 1:08 PM
To: Rob Matson
Cc: meteorite-list
Subject: Re: [meteorite-list] Osceola Meteorite is Official!

Hi Rob and List,

I can attest to the difficult terrain. I certainly picked a doozie for
my first meteorite hunt. Even though I have hiked much of Florida's
forests and backwoods, I usually avoid the swampy areas. I did not
have the luxury of avoiding swamp with this hunt. I brought my
hip-waders and managed to reach a few dry places that were surrounded
by water, but nothing was found.  I am heading back before the end of
April for one last college try before I hang it up.

Did Arkansas Steve find anything?

Best regards and Happy Huntings,

MikeG

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Re: [meteorite-list] Osceola Meteorite is Official!

[Rob Matson via Meteorite-list]

Congratulations to Mike, Larry, Laura, Josh and Brendan for their 
aggressiveness in
getting to the fall location quickly and their persistence in the face of very
unfavorable searching conditions (SWAMP!)  It is an impressive feat that 
anything
was found at all, even with the nice radar returns.

I have one correction: I'm pretty sure Larry was the second on the scene. Steve
Arnold drove all night from Arkansas to arrive (I believe) the morning after
the fall -- Monday, January 25.  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On 
Behalf Of Michael Gilmer via Meteorite-list
Sent: Saturday, April 02, 2016 11:00 AM
To: Meteorite List
Subject: [meteorite-list] Osceola Meteorite is Official!

Osceola meteorite is official, approved by NonCom and entered into the
Met Bull today - http://www.lpi.usra.edu/meteor/metbull.php?code=63109

Osceola30�27.16�N, 82�27.25�W
Florida, USA
Confirmed fall: 2016 Jan 24
Classification: Ordinary chondrite (L6)

History: (Mike Hankey, Larry Atkins, Laura Atkins, Josh Adkins,
Brendan Fallon, Robert Matson, Marc Fries) On Sunday Morning 24
January at 10:27 EST (15:27 UTC) a large daytime fireball streaked
across the sky in northern Florida. Over 100 eyewitnesses reported the
event to the American Meteor Society (Event 2016-266), describing a
white sparkling head and plume of white smoke left behind. Fireball
researchers Marc Fries and Rob Matson, found the American Meteor
Society witness trajectory intersected with a group of radar returns
that appeared shortly after the fall. The radar returns were strong,
found at multiple altitudes and located on multiple stations: KJAX,
KVAX and KTHL. Larry Atkins was the first on the scene. Mike Hankey
arrived 5 days after the fall with Brendan Fallon and joined Larry and
Laura Atkins in the hunt. On the 6th day, Mike Hankey found the first
stone at 8.5 g on the eastern edge of the primary radar return. Within
2 hours Larry Atkins found the second stone (18.5 g) directly under
the radar. The next day, two more stones were found: a 5.5 g stone by
Laura Atkins and a 48.5 g stone by Mike Hankey. Six days later over 2
miles away from the first find, an 839 g mass was found by Josh Adkins
and Brendan Fallon. A week after that, Larry Atkins found the last
stone, weighing 75.5 g. In total 6 stones were found over a three week
hunting period for a total weight of 990.5 g.

Physical characteristics: Thin, well formed shiny fusion crust covers
the exterior of four of the stones, while two of them, the 43 g and
the 839 g are matte black. This is likely due to submersion in wet
sand and/or water prior to recovery. Some small rust spots are evident
on some of the stones as well. Small regmaglypts are present on the 43
g and the 839 g stones, and the remaining stones are irregularly
shaped with little to no orientation. Some chondrules are visible
through the crust. The interior of the meteorites are slightly
darkened due to shock. Shock veins are present, some of which are
black while others are filled with metal, appearing as long "strings"
up to 3 mm long. Though most of the chondrules have been altered and
are not well defined, some rare, large chondrules up to 0.8 mm are
present.

Petrography: Plagioclase grains are up to 100 �m in size, consistent
with type 6. No maskelynite was found. There are numerous
chromite-plagioclase assemblages, consistent with moderately strong
shock. Chromite grains are fractured. Troilite is polycrystalline.
Metallic copper occurs as 2-�m-thick bands at the metal-troilite
interface in an opaque assemblage. The chondrules are recrystallized
and poorly defined. The only discernible chondrules are large ones,
800-1000 �m across; these are BO and PO textural types.

Geochemistry: Olivine Fa23.7�0.3 (n=21), Orthopyroxene
Fs20.2�0.2Wo1.6�0.2 (n=14). Also present are small grains of diopside:
Fs7.4 Wo44.9 (n=1). Plagioclase has a mean composition of Ab71.7�1.6
Or8.8�2.5 (n=8); the low Na and high K values are a result of shock.

Specimens: 21.8 g at UCLA
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[meteorite-list] 2nd recovered U.S. fall of 2016

[Rob Matson via Meteorite-list]

[Resending from a different account since the first attempt has not
shown up. Apologies if this turns out to be a repeat...]

Hi All,

Just want to report that the west Texas bolide that occurred one week
ago on the evening of 17 February 2016 is officially a fall: the second
successful radar-enabled recovery of 2016 (following Osceola, Florida)
as well as Texas' second Doppler-cued recovery (the first of course
being Ash Creek almost exactly seven years ago). Congratulations to
the persistent meteorite recovery team who walked the many miles to
make this another success story! --Rob


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Re: [meteorite-list] Very Bright Fireball Over Europe on Halloween Night

[Rob Matson via Meteorite-list]

HI All,

Marco took the words out of my mouth. Getting tired of hearing that a green
meteor tells you anything about its composition. I know that it's natural for
people to think the most important thing they can report about a meteor
is its color, but I wish various broadcast media would do the public a service
and disabuse them of this notion. It would be far better if witnesses
could be trained to get in the habit of counting the duration accurately,
and noting the exact time of the meteor to the nearest minute. Seeing as
how almost everyone has a cell phone these days, and all cell phones have
accurate clocks, there really is no excuse to get the time wrong. Yet even
a casual browse of the AMS fireball site reveals that people clearly don't
think getting the time right is important. And even more obvious is that
most people have no business reporting anything about fireball starting
and ending bearings and elevation angles.  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Marco Langbroek via Meteorite-list
Sent: Wednesday, November 04, 2015 12:06 AM
To: meteorite-list@meteoritecentral.com; baa...@zagami.jpl.nasa.gov
Subject: Re: [meteorite-list] Very Bright Fireball Over Europe on Halloween
Night

> A lot of folks say it looked green to them, which means it may have been
> metallic;


It is a perpetuated misunderstanding that meteor colours are primarily due to 
their composition. It's a science myth inspired by High School Bunsen burner 
experiments that appears hard to kill.

While composition in some cases does have some influence on the colour, it is 
actually the composition of the atmosphere that is usually dominant for our 
perception of meteor colours.

That certainly is true for green colours. Meteor spectra show that meteors 
usually are very strong at the "forbidden" Oxygen line at 5577 Angstrom (557.7 
nm). This line is due to atmospheric Oxygen, the same atmospheric Oxygen 
exitation line also responsible for the green colours of Aurora.

So green meteor colours are likely atmospheric in origin and say little about 
the meteoroids' composition.

- Marco

-
Dr Marco (asteroid 183294) Langbroek
Dutch Meteor Society (DMS)

e-mail: d...@marcolangbroek.nl
http://www.marcolangbroek.nl

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Re: [meteorite-list] A Managua, Nicaragua meteorite?

[Rob Matson via Meteorite-list]

Hi Sterling,

Note the erroneous, yet predictable association with 2014 RC in these
reports. It's Chelyabinsk and 2012 DA14 all over again. Does sound a little
like Carancas Take 2, but near a city of over 1 million people -- no fireball
witnesses?  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Sterling K. Webb via Meteorite-list
Sent: Monday, September 08, 2014 7:05 AM
To: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] A Managua, Nicaragua meteorite?

Kevin, List,

It looks a great deal like the Carancas 
crater, although it's a little smaller, 
about 80% of its size. The test would be: 
are there meteorites scattered about?

Good photo (official Army photo) found 
here:
http://www.smh.com.au/world/rare-meteorite-impact-causes-blast-in-nicaraguas-cap
ital-managua-20140908-10dsqo.html

and
http://www.usatoday.com/story/tech/2014/09/07/meteorite-strikes-nicaragua/152629
73/

and some film from Russia:
https://news.google.com/nwshp?hl=entab=wnar=1410130829

They are sweeping with metal detectors, 
but only on the well-worn pathway, not 
in the grass!

More photos here:
http://news.yahoo.com/meteorite-smashes-nicaraguan-capital-230034550.html;_ylt=A
wrSyCUf6AxUNwYAZ5fQtDMD


Sterling Webb
--
-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Kevin Kichinka via Meteorite-list
Sent: Sunday, September 07, 2014 5:47 PM
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] A Managua, Nicaragua meteorite?

Team Meteorite:

There appears a photo of an alleged meteorite crater in the news just a few
moments ago.

It's being well-guarded by armed Sandinista's.

Does anyone beside Nica jefe Daniel Ortega think this looks like a met
crater?

http://www.ticotimes.net/2014/09/07/meteorite-smashes-into-nicaraguan-capita
l

Kevin Kichinka
Rio Oro, Santa Ana, Costa Rica
The Art of Collecting Meteorites (Amazon and Barnes and Noble eBook) The
Global Meteorite Price Report - 2015 out in late December mars...@gmail.com
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Re: [meteorite-list] WWBT

[Rob Matson via Meteorite-list]

I'm on it -- will let you know if anything shakes out on radar...  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Ruben Garcia via Meteorite-list
Sent: Friday, July 18, 2014 8:31 AM
To: J Sinclair
Cc: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] WWBT

We'll have to wait for Mark Fries or Rob Matson to give us an X on the
map - we need a new fall in the US. Why should Northwest Africa get
all the fun?

On Fri, Jul 18, 2014 at 8:04 AM, J Sinclair via Meteorite-list
meteorite-list@meteoritecentral.com wrote:
 Possible meteorites on the ground. Lots of reports here in North
 Carolina. I'm also reading reports of a sonic boom and the ground
 shaking in Virginia.
 Great video from a dash cam.

 John

 On Fri, Jul 18, 2014 at 9:36 AM, Dennis Miller via Meteorite-list
 meteorite-list@meteoritecentral.com wrote:

 http://m.nbc12.com/#!/newsDetail/26050632


 Sent from my iPhone
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-- 
Rock On!

Ruben Garcia
http://www.MrMeteorite.com
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[meteorite-list] 2014 St. Thomas meteor

[Rob Matson via Meteorite-list]

Hi Mike/Mike/All,

I wondered if I had missed something. As far as I knew, nothing had been found
(yet)
for the St. Thomas fall east of Toronto. The fall location is pretty well
constrained by
video (and possibly radar as well), so if anything survived to the ground I
expect
something will eventually be found.  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Michael Farmer via Meteorite-list
Sent: Tuesday, June 03, 2014 6:07 PM
To: Galactic Stone  Ironworks
Cc: Meteorite List
Subject: Re: [meteorite-list] Happy Birthday to Comayagua (Recent Falls)

Why do you list the Canada thing, nothing was found that O ever heard about.
Michael Farmer

Sent from my iPhone

 On Jun 3, 2014, at 5:51 PM, Galactic Stone  Ironworks
meteoritem...@gmail.com wrote:
 
 That's a shame.  It's one of those meteorites that is destined just be
 an obscure footnote.  I wonder if any of it will ever surface, and if
 so, the chain of provenance will be murky.
 
 For those that are interested, here are the known and/or official
 falls since 2012 :
 
 2014 -
 
 Feb 17, 2014 - Santa Fe (unofficial) (unknown type) : Argentina
 Feb 28, 2014 - Rift Valley (unofficial) (ordinary chondrite?) : Kenya
(Hammer)
 Mar 09, 2014 - Jinju (unofficial) (ordinary chondrite?) : South Korea
 Mar 18, 2014 - St. Thomas (unofficial) : (unknown type) : Canada
 
 2013 -
 
 Jan 15, 2013 - Planeta Rica (unofficial) (ordinary chondrite?) : Colombia
 Feb 15, 2013 - Chelyabinsk - (LL5 chondrite) : Russia (Hammer)
 Apr 19, 2013 - Wolcott (unofficial) (ordinary chondrite?) :
 Connecticut USA (Hammer)
 Apr 23, 2013 - Braunschweig (L6 chondrite) : Germany (Hammer)
 May 09, 2013 - Oshika (unofficial) (ordinary chondrite?) : Namibia
 Jun 15, 2013 - Yuncheng-Shanxi (unofficial) (ordinary chondrite?) : China
 Sep 23, 2013 - Vicencia (unofficial) (ordinary chondrite?) : Brazil
 
 2012 -
 
 Feb 11, 2012 - Xining (L5 chondrite) : China
 Mar 01, 2012 - Oslo (unofficial) (ordinary chondrite?) : Norway (Hammer)
 Apr 22, 2012 - Sutter's Mill (CM - Regolith Breccia) : California USA (Hammer)
 May 04, 2012 - Ladkee (H6 chondrite) : Pakistan
 May 22, 2012 - Katol (L6 chondrite) : India (Hammer)
 Jun 03, 2012 - Comayagua (unofficial) (ordinary chondrite?) :
 Honduras (Hammer)
 Jul 08, 2012 - Jalangi (unofficial) (ordinary chondrite?) : India
 Aug 22, 2012 - Battle Mountain (L6 chondrite) : Nevada USA
 Oct 12, 2012 - Beni Yacoub (unofficial) (ordinary chondrite?) : Morocco
 Oct 17, 2012 - Novato (L6 chondrite) : California USA (Hammer)
 Oct 30, 2012 - Addison (unofficial) (ordinary chondrite?) : Alabama USA
 Dec 16, 2012 - Mreira (L6 chondrite) : Mauritania (fall classified as a find)
 
 All falls since 2000 : http://www.galactic-stone.com/pages/falls
 
 Best regards and Happy Huntings,
 
 MikeG
 
 -- 
 -
 Web - http://www.galactic-stone.com
 Facebook - http://www.facebook.com/galacticstone
 Twitter - http://twitter.com/galacticstone
 Pinterest - http://pinterest.com/galacticstone
 -
 
 
 On 6/3/14, Michael Farmer m...@meteoriteguy.com wrote:
 Nothing new other than the stone has vanished. Supposedly sold for $80,000
 to the local university. Anyone who has been to Honduras would know that
 could never happen.
 Sad loss for a stone which penetrated a roof and bed while a man was laying
 in it watching TV! He came a few mm from being one of the most famous people
 in the world as a meteorite casualty.
 
 
 Michael Farmer
 
 Sent from my iPad
 
 On Jun 3, 2014, at 2:46 PM, Galactic Stone  Ironworks via Meteorite-list
 meteorite-list@meteoritecentral.com wrote:
 
 Hi Listees,
 
 Today is the 2nd anniversary of the Comayagua meteorite fall in
 Honduras - June 03, 2012.
 
 Any news about that fall or recoveries to mention?
 
 Best regards,
 
 MikeG
 
 --
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 Web - http://www.galactic-stone.com
 Facebook - http://www.facebook.com/galacticstone
 Twitter - http://twitter.com/galacticstone
 Pinterest - http://pinterest.com/galacticstone
 -
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Re: [meteorite-list] Colin Pillinger

[Rob Matson via Meteorite-list]

Hi Kevin,

I watched the video yesterday and wholeheartedly concur with you. Very
interesting talk by an engaging boffin, and a lot of the information was
new to me. I'm very sorry to read of the loss of such an excellent
meteorite ambassador at a young age.

One correction: Prof. Pillinger didn't say the Nakhla dog story was apocalyptic
--
he said apocryphal. Just a little bit of a difference there!  ;-)  --Rob

-Original Message-
From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com] On
Behalf Of Kevin Kichinka via Meteorite-list
Sent: Friday, May 09, 2014 9:23 AM
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] Colin Pillinger

Team Meteorite:

The 'Michael Faraday Prize Lecture' video linked here yesterday in a
list member's heartfelt obituary for the late Professor Colin
Pillinger earns a 'two thumbs up' from this reviewer.

Professor Pillinger offers insights into the falls of Ensisheim,
Sienna, Wold Cottage and Chassigny full of content I have never known,
and I consider myself somewhat of a met history buff. Did you know
that 'Wold Cottage' was a mansion? That the owner's sense of humor was
exposed when he named his black dog, 'Snowball'?

The photos and drawings used to illustrate Pillinger's stories were
also unknown to me, and are exquisite. I wish for copies to hang over
the fireplace.

And speaking of dogs, Professor Pillinger calls the Nakhla dog story
apocalyptic. And I'm here to tell you well, you know how I feel
about that :)

A discussion of ALH84001 and EETA79001 and their revealed carbonates
led him to state, Life on Mars could be contemporary.

But here's some words to consider, as we all soon enough will be
'falling stars'...

All you that do behold my stone,
O, think how swiftly I was gone.
Death doth not always warning give,
Therefore be careful how you live.

Watch the celebration of a man's life given to meteoritics. See it here.

https://royalsociety.org/events/2012/stones-from-the-sky/

Kevin Kichinka
Rio Oro, Santa Ana, Costa Rica
The Art of Collecting Meteorites on Amazon and Barnes and Noble
The Global Meteorite Price Report - 2015 available December, 2014.
mars...@gmail.com
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