Re: [meteorite-list] (no subject)

[Doug Ross via Meteorite-list]

Hi Doug,

Here is a link to the original paper:

http://www.nature.com/articles/s41550-016-0035

"Our data show that the meteorite flux has varied over geological time as 
asteroid disruptions create new fragment populations that then slowly fade away 
from collisional and dynamical evolution. The current flux favours disruption 
events that are larger, younger and/or highly efficient at delivering material 
to Earth."

Cheers from the “other” Doug,

Doug Ross






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Re: [meteorite-list] Bolivian Meteorite Adventure

[Doug Ross via Meteorite-list]

Thanks for the great trip report and pics, Greg! Glad you guys made it back 
safe, and with something to show for your efforts. Too bad you couldn't stay 
and hunt. It sounds like a substantial fall, with so many large stones 
recovered so quickly, despite what looks like very difficult terrain.
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Re: [meteorite-list] Earth time dilation: minimal latitude-dependence

[Doug Ross via Meteorite-list]

> However given the speed he travels at, I would think Santa's waistline would 
> be ablated after the run, and he would leave ionic trails. Not to mention, 
> Rudolf's nose would be blue-shifted beyond UV the spectrum of visible light.

Lol! You guys crack me up. Thanks for livening up the list with a great thread.

Doug Ross






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Re: [meteorite-list] 2nd recovered U.S. fall of 2016 - more details

[Doug Ross via Meteorite-list]

What a remarkable story! I’m so excited to see the technology coming together 
to produce results like this, and very grateful to Rob and the many volunteers 
who selflessly contribute so much time and expertise to the effort. I can 
imagine that the increasing proliferation of dashcams is likely to lead to more 
and more recoveries in the future. Congratulations to all involved!

Doug Ross



> On Thu, 2/25/16, Matson, Rob D. via Meteorite-list 
>  wrote:
> 
> Subject: [meteorite-list] 2nd recovered U.S. fall of 2016 - more details
> To: "meteorite-list@meteoritecentral.com" 
> 
> Date: Thursday, February 25, 2016, 10:22 AM
> 
> Hi All,
> 
> Some further information about the circumstances leading to the successful
> meteorite recovery east of Lubbock, TX. First off, Mike Hankey deserves 
> special
> notice since often the first indication we have of a new potential fall is the
> AMS website that he maintains. Marc Fries was the first to spot the nice
> Lubbock radar returns for this fall -- less than 18 hours after the event! I
> compiled those, and additional returns I found in the Amarillo radar, and
> then went on a search for seismic signatures or videos that could be used
> to pin down the time of the event. One Youtube video surfaced right away,
> taken from a dashcam on highway 183 near Euless, Texas:
> 
> https://www.youtube.com/watch?v=qMkeVGSlV7o
> 
> Pat Branch did some quick work measuring terminus angles, concluding that
> the vector lined up perfectly with the radar returns east of Lubbock. I soon
> located two more videos, one from some still undetermined location near
> Augusta, Kansas (east of Wichita) and some 580 km (!) from the fall:
> 
> https://www.youtube.com/watch?v=YPDoZYfH4ko
> 
> and another from a dashcam near Edmond, OK, north of Oklahoma City:
> 
> https://www.youtube.com/watch?v=qPb7jrtX4p0
> 
> Pat Branch was successful in contacting the driver of this car who provided
> his exact location. There are numerous landmarks in this video that allowed
> me to determine reasonably accurate starting and ending directions. 
> Triangulating
> this video with the one from Euless led to a fairly steep fireball entry 
> angle and
> a nearly due west trajectory.
> 
> However, upper atmospheric winds were relatively strong (over 100 mph to
> the southeast,) and not surprisingly this is the trend we see in the radar 
> returns.
> All that remained was to get an accurate time for the event so that meteorite
> masses could be estimated (based on the time delay between the fall and
> when various radar volumes were scanned). Unfortunately, none of the
> three videos above has a sufficiently accurate timetag.
> 
> But here again Pat came to the rescue. Rob Ferguson (the provider of the
> Edmond, OK dashcam) emailed Pat telling him that the fireball was also
> captured by the Oklahoma Dept. of Emergency Management's tower cam,
> and that a friend of his (Putnam Reiter) works there and pulled the video for
> him. This has a great, unobstructed view of the event, being up on a tower
> some 200 feet! Most importantly, it has a very accurate timetag, being
> regularly synced with a NTP server. So we now knew the beginning of the
> event was at 3:44:08 UT (21:44:08 CST). I determined that the earliest radar
> returns of the fall were from Amarillo NEXRAD at 3:45:49.7, just 99 seconds
> after the beginning of dark flight (~21:44:11 UT). This was how we knew
> meteorites were on the ground for sure, since dust or even small pebbles
> can't fall that far in less than 2 minutes.
> 
> Anyway, this is getting a bit long and I want to get these details out
> there sooner rather than later in order to credit some of the important
> players that made this all happen. Hopefully it gives you a sense of the
> amount of detective work goes into chasing down these falls, and how
> much of a team effort it is.
> 
> Cheers!
> Rob
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Re: [meteorite-list] Very Bright Fireball Over Europe on Halloween Night

[Doug Ross via Meteorite-list]

Thanks for the very informative and interesting discussion. Could the altitude, 
angle and distance from which a meteor is viewed also affect perceived color? 
Seems to me that the air between the fireball and the witness might 
significantly filter the colors, in the same way that the sun can appear red at 
sunset, viewed at a low angle through more atmosphere.

Doug Ross


> 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] Gold Basin

[Doug Ross via Meteorite-list]

Congratulations to Joe and Larry on this great accomplishment, 20 years after 
the original discovery of the Gold Basin meteorite! That is some seriously 
remote and challenging terrain you have tackled to extend the known strewn 
field. And your conscientious efforts to document and share find data set a 
great example for all who plan to follow in your footsteps. It’s a great day 
for all of us who have enjoyed hunting Gold Basin, and bodes well for future 
hunting trips.

All the best,

Doug Ross
d...@dougross.net


 Hello List,
 
 As you may have heard, there has been a major development concerning
 the Gold Basin strewn field. Of course, it's possible this is not GB
 but the evidence looks very promising.
 
 Three years ago Joe Franske ventured to the north side of Lake Meade in
 search of the big end of Gold Basin. According to Joe, it took him 6
 tries to get to the right location, but once he did, it took him only 3
 hours to find a meteorite. This is a monumental feat to say the least.
 He brought me in on the project last March and I take no credit for
 this discovery. Sure, we all had an idea that the strewn field crossed
 the lake, we all drew lines, but only one guy had the steel to go get
 it done. Hats off to Joe.
 
 Joe and I have decided we are pretty much done out there for now. We
 documented well over 100 pounds, most of which was found on the
 south side of Jumbo Peak. Last week I extended the field another 5.75
 miles with 2 finds on the north side of Jumbo, including
 a 34 pound stone that was broken into many pieces. We decided to give you guys
 some details regarding the find
 locations, hence this message, but in return we would like to know
 about
 any finds you make so that we may continue documenting the strewn
 field. Jim Kreigh, John Blennert and Twink Monrad did a fantastic job
 documenting in the past and we would like to do the same. I know there
 are some hunters out there that will not share and so be it, but most
 of us are
 good people and I would expect some cooperation for the good of the
 larger picture. Please send your reports to me so that I can share them
 with the scientist involved with our work.
 
 Joe found the first stone on the south side of Jumbo Peak and that is
 where the majority of the finds were made. The area is only about a
 mile wide and I highly doubt that defines the outer limits of the
 field, however, to go farther east or west is difficult due to terrain.
 Go onto Google earth and you will see the valley just south of the peak, and 
 north of the park boundary,
 this is where you start.
 
 On the north side of Jumbo Peak you will find most of the area too soft
 for meteorite recovery. Decomposing granite has likely buried the
 stones too deep for detection. In my mind it's a small miracle that I
 found the 2 stones on that side. To put the difficulty into
 perspective, we spent 36 man days to locate the 2 stones and out of
 four hunters I was the only one to score. That place will hand your
 butt
 to you on a platter, as they say.
 
 As a side note;
 If you decide to give this place a try there are some things to
 consider. To get to the south side of Jumbo you will need a 4 wheel
 drive and it takes about 3.5 - 4 hours once you leave Mesquite. There
 is no phone service and the road out wants to eat your truck! If you
 go, plan to stay for several days at least, it's a lot of work and
 expense just for a day or two.
 
 If you have any specific questions feel free to email me.
 
 Good luck and fair sailing to all who go!
 
 
 
 
 Here's the low down on the science so far.
 
 I submitted samples from my 16+ lb. stone (found March, 2014) to UCLA
 this past summer.
 It did come back L6 as can be seen below. Dr. Kring wants to do
 more work including cosmogenics and such, on several different samples
 to help come to a conclusion as to whether or not it is indeed Gold
 Basin .
 
 When asked how I know it's GB I say that the classification is
 consistent, they look the same in hand, on the exterior and the
 interior, and they are in line with the logical progression of the
 known field. Sure, it could be something different, but simply put,
 the easiest, most obvious and logical answer is usually the right
 answer. I'd be very, very surprised if it was something else.
 
 UCLA (Rubin, Breen)
 
 received August 18, 2014, 2 pieces, 23.7 g
 L6  S4  W1
 olivine: Fa 23.9?0.2 (n=15); low-Ca pyroxene: Fs20.3?0.3 Wo1.6?0.2
 (n=12)
 
 plagioclase grains are typically 60-100 ?m in size. The rock exhibits
 weak mosacisim but does not contain maskelynite.
 
 
 
 Sincerely,
 Larry Atkins
 
 IMCA # 1941
 Ebay alienrockfarm
 
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[meteorite-list] Fwd: Gold Basin

[Doug Ross via Meteorite-list]

Congratulations to Joe and Larry on this great accomplishment, 20 years after 
the original discovery of the Gold Basin meteorite! That is some seriously 
remote and challenging terrain you have tackled to extend the known strewn 
field. And your conscientious efforts to document and share find data set a 
great example for all who plan to follow in your footsteps. It’s a great day 
for all of us who have enjoyed hunting Gold Basin, and bodes well for future 
hunting trips.

All the best,

Doug Ross
d...@dougross.net


 Hello List,
 
 As you may have heard, there has been a major development concerning
 the Gold Basin strewn field. Of course, it's possible this is not GB
 but the evidence looks very promising.
 
 Three years ago Joe Franske ventured to the north side of Lake Meade in
 search of the big end of Gold Basin. According to Joe, it took him 6
 tries to get to the right location, but once he did, it took him only 3
 hours to find a meteorite. This is a monumental feat to say the least.
 He brought me in on the project last March and I take no credit for
 this discovery. Sure, we all had an idea that the strewn field crossed
 the lake, we all drew lines, but only one guy had the steel to go get
 it done. Hats off to Joe.
 
 Joe and I have decided we are pretty much done out there for now. We
 documented well over 100 pounds, most of which was found on the
 south side of Jumbo Peak. Last week I extended the field another 5.75
 miles with 2 finds on the north side of Jumbo, including
 a 34 pound stone that was broken into many pieces. We decided to give you guys
 some details regarding the find
 locations, hence this message, but in return we would like to know
 about
 any finds you make so that we may continue documenting the strewn
 field. Jim Kreigh, John Blennert and Twink Monrad did a fantastic job
 documenting in the past and we would like to do the same. I know there
 are some hunters out there that will not share and so be it, but most
 of us are
 good people and I would expect some cooperation for the good of the
 larger picture. Please send your reports to me so that I can share them
 with the scientist involved with our work.
 
 Joe found the first stone on the south side of Jumbo Peak and that is
 where the majority of the finds were made. The area is only about a
 mile wide and I highly doubt that defines the outer limits of the
 field, however, to go farther east or west is difficult due to terrain.
 Go onto Google earth and you will see the valley just south of the peak, and 
 north of the park boundary,
 this is where you start.
 
 On the north side of Jumbo Peak you will find most of the area too soft
 for meteorite recovery. Decomposing granite has likely buried the
 stones too deep for detection. In my mind it's a small miracle that I
 found the 2 stones on that side. To put the difficulty into
 perspective, we spent 36 man days to locate the 2 stones and out of
 four hunters I was the only one to score. That place will hand your
 butt
 to you on a platter, as they say.
 
 As a side note;
 If you decide to give this place a try there are some things to
 consider. To get to the south side of Jumbo you will need a 4 wheel
 drive and it takes about 3.5 - 4 hours once you leave Mesquite. There
 is no phone service and the road out wants to eat your truck! If you
 go, plan to stay for several days at least, it's a lot of work and
 expense just for a day or two.
 
 If you have any specific questions feel free to email me.
 
 Good luck and fair sailing to all who go!
 
 
 
 
 Here's the low down on the science so far.
 
 I submitted samples from my 16+ lb. stone (found March, 2014) to UCLA
 this past summer.
 It did come back L6 as can be seen below. Dr. Kring wants to do
 more work including cosmogenics and such, on several different samples
 to help come to a conclusion as to whether or not it is indeed Gold
 Basin .
 
 When asked how I know it's GB I say that the classification is
 consistent, they look the same in hand, on the exterior and the
 interior, and they are in line with the logical progression of the
 known field. Sure, it could be something different, but simply put,
 the easiest, most obvious and logical answer is usually the right
 answer. I'd be very, very surprised if it was something else.
 
 UCLA (Rubin, Breen)
 
 received August 18, 2014, 2 pieces, 23.7 g
 L6  S4  W1
 olivine: Fa 23.9?0.2 (n=15); low-Ca pyroxene: Fs20.3?0.3 Wo1.6?0.2
 (n=12)
 
 plagioclase grains are typically 60-100 ?m in size. The rock exhibits
 weak mosacisim but does not contain maskelynite.
 
 
 
 Sincerely,
 Larry Atkins
 
 IMCA # 1941
 Ebay alienrockfarm
 




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Re: [meteorite-list] Gold Basin

[Doug Ross via Meteorite-list]

Congratulations to Joe and Larry on this great accomplishment, 20 years after 
the original discovery of the Gold Basin meteorite! That is some seriously 
remote and challenging terrain you have tackled to extend the known strewn 
field. And your conscientious efforts to document and share find data set a 
great example for all who plan to follow in your footsteps. It’s a great day 
for all of us who have enjoyed hunting Gold Basin, and bodes well for future 
hunting trips.

All the best,

Doug Ross
d...@dougross.net





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[meteorite-list] Tucson pics?

[Doug Ross via Meteorite-list]

Hi all,

Any pics from Tucson? I wish I could have gone this year, and would love to see 
what goodies I’m missing out on….

Doug Ross
d...@dougross.net



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Re: [meteorite-list] Alamo Breccia Video

[Doug Ross via Meteorite-list]

Nice video, Paul! Thanks for sharing.

Doug Ross
d...@dougross.net


 Here is the video of our hunting different locations of the Alamo Breccia
 and a possible impact site.
 
 enjoy:
 
 https://www.youtube.com/watch?v=yf_d21VC4dM
 
 -Paul G
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[meteorite-list] AD - lunar collection for sale

[Doug Ross via Meteorite-list]

Attention lunatics! After years of focusing mainly on lunar meteorites, I am 
now thinking of selling off my lunaite collection to pursue various other 
meteorite types. Anybody who might be interested can view all of my lunars at 
the EOM link below. The specimens aren't very large, but do represent over half 
of all non-antarctic lunar pairings, as listed on Dr. Randy Korotev's WUSTL web 
site. Many are extremely rare, and almost impossible to obtain. I would prefer 
to keep the whole collection together, and sell it as a set. If interested, 
feel free to email me with any questions or to make an offer. Thanks for 
looking! Authenticity of all specimens guaranteed. IMCA#2641

Link to the collection: 
http://www.encyclopedia-of-meteorites.com/collection.aspx?id=2904

Doug Ross
IMCA #2641
d...@dougross.net


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