Jerry:
Ditto
Larry
On Tue, November 13, 2007 6:25 pm, Sterling K. Webb wrote:
Hi, Jerry, List,
This site is Johnny Tonto of Pueblo, Colorado.
He been much discussed on the List. His craters
are largely Craters of the Mind, I think. I ain't convinced, at any rate.
Sterling K. Webb
Dear Geoff:
Our prayers are with Leigh Anne today.
Larry and Nancy Lebofsky
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they are covering the sky in order to locate any asteroids
heading toward the Earth.
However, Doug, Pluto and the IAU decision is another story that we should
discuss over beers sometime.
Larry Lebofsky
On Mon, November 12, 2007 6:51 pm, mexicodoug wrote:
Hi Darren,
It certainly was an actual
Hi List:
I am trying this again since my previouys forward did not appear to go
through.
On November 13, this newly-discovered asteroid (only about 20 meters
diameter) will pass within 2 Earth radii of the CENTER of the Earth (that
is close). It will be 9th magnitude (about 50-100 times too
The first announcment was a real one. I do not think that it was at first
realized that it was Rosetta!
I hope there will be more info in the next few days.
Larry
On Fri, November 9, 2007 11:35 am, mexicodoug wrote:
Someone has a sense of humour, especially the flying couch comment !
So,
the collisional possibilities of Comet Holmes passing through
the Asteroid Belt, some of them might have noticed that Comet Holmes
DOES NOT PASS
through the Asteroid Belt!
I'm being sarcastic about this because I made exactly the
same mistake myself, until an astronomer, List member Larry Lebofsky
is 3
arc minutes (1/10 of the lunar diameter) from a 7th magnitude star
(HIP17476). It really gives you a feel for how thin the material in the
coma of Holmes really is!
Larry and Nancy Lebofsky
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Hi Don:
Starry Night saves the need of a space suit. John Carter, who did not need
a space suit, also did not need a computer program to get him to Mars!
I still had my try at this running at home with Starry Night 5.x and the
major difference is that the comet is in Cassiopeia. Not a large
Hi All:
Another thing against an asteroid impact. If you go to the comet orbit
site at JPL for Holmes, because of its inclination relative to the
ecliptic, it crosses near Mars and Near Jupiter, not in the middle of the
asteroid belt. It passed through the plane of the Solar System back in
Hi Again Sterling:
Next plane crossing (at 4.8 AU or so) is in 2 years. At that time Jupiter
is on the other side of the Sun, so the Trojans, which ar, on average, 60
degrees fore and aft of Jupiter not not even close this time around.
So, my bias is a thermal burp (belch). I have seen what an
For you non-astronomical types:
I-filter is 0.9 microns (800 nm)
J-filter is 1.25 microns (1250 nm)
Visible is about 0.6 microns
Larry
On Mon, October 29, 2007 5:29 pm, Ron Baalke wrote:
POSSIBLE DETECTION OF A SHORT TAIL BEHIND COMET 17/P HOLMES
Universite de Montreal
October 29, 2007
Darren:
Please thank Anne for the article! :-) It is something that I can use in
my class. I would like to meet her some day. Does she go to the Tucson Gem
and Mineral Show?
Larry
On Fri, October 26, 2007 7:15 am, Darren Garrison wrote:
On Thu, 25 Oct 2007 22:59:53 -0400, you wrote:
Hi Again:
If one were on Mars (hold your breath and bring a warm jacket), Holmes
would be 1.17 AU away (vs. 1.63 AU) and 0.7 magnitudes (2 times) brighter
than what we see. And there would be less intereference from moonlight!
Larry
On Wed, October 24, 2007 2:20 pm, mexicodoug wrote:
Hi Again
Hi Don:
I am still running 5.X and it works fine. Unfortunately the updates still
give it as 17th magnitude. Thanks to Sterling I moved to Mars to see how
bright it was (2 times brighter).
Larry
On Thu, October 25, 2007 4:48 pm, Don Merchant wrote:
Hi List. If any of you have Starry Night Pro
Jerry and Mark:
Nancy and I just went out and saw it again tonight. It appears brighter
than last night and it is clearly much more comet-like than last night.
Yesterday it looked just a little not-star-like, but tonight, it is
obviously fuzzy with the star-like condensation. It is clearly
Hi Again:
We just looked at it with a 100mm f/5 telescope and it is clearly orange.
However, it is also very obvious that this thing is unusual. I thought
that I had a focusing problem, but the scope was in focus.
There is a beautiful circular coma, but the condensation is NOT
star-like. It is
Hi Sterling:
It looks more like a planetary nebula to me! I will try to get an estimate
of its size tomorrow night when I am at a darker site in Yuma with a
bigger scope and maybe a camera.
It is always hard to get a real magnitude for a comet since one usually
talks about integrated magnitude.
Hello Don:
Sounds good to me! We could see all three in the same field of the binocs
and then could see it even with the naked eye. Not bad for a nearly full
moon! It looked a little reddish and the three of us (Nancy, me, and one
of my students) all could convince ourselves that it did not quite
Hello Jerry:
Based on Starry Night, the Shuttle was about 360km away at closest and ISS
about 390km away. At 300,000 km/sec (speed of light), we are talking about
1/1000 of a second for light to get from there to here. Not sure how far
apart they were, but do not think that it was very much
Too mnay objects running around.
1 AU = 149,600,000 km
Comet Holmes = 1.6345 AU from earth this evening
(in two days it will be down to 1.630 AU, better duck)
This gives a distance of 244,500,000 km
Speed of light is 299,800 km/sec
So Light Distance = 816 seconds (give or take)
Larry
On
Hello Everyone:
I just received this from a colleague of mine and rather give him my best
guess, thought it would be best to ask the experts. Don McCarthy is an
infrared astronomer an instrument builder who does everything from
asteroids and comets, to extrasolar planets, to the origin of the
Dirk:
1 light year = 9.46 X 10^15 meters or 9.46 x 10^12 km. So, in 50 years:
4.7 x 10^14 km (470 trillion kilimeters). That is within range of a lot of
stars.
There are a 100 stars within 7.63 parsecs (almost 25 light years), so if
you double the distance, there are about 800 stars (star
Hello Sterling:
You need to take the ionosphere into account. If memory serves me, AM
radio does not get through, while FM does. TV gets through, too.
Hence the images of Hitler at the opening of the Olympics being picked up
and re-transmitted in Contact. Or I Love Lucy in an episode of Amazing
Based on my vast experience, they can spawn zombies (and other similar
things), carry invaders, and produce singing plants. I can always check my
collection of bad and not so bad movies. Oh, you can also become a
superhero, but if it is green, superheros need to beware.
Larry
On Wed, September
Hello everyone:
I leave for Denver tomorrow morning (Thursday) and hope to see many of you
there.
It is that time again for submission of articles to Meteorite. The August
issue should be on its way and Nancy and I are just finishing off the
proofing of the November issue (it never ends).
We
Lebofsky
Editor, Meteorite magazine
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or
larger. Please send it directly to me.
Thanks in advance.
Larry Lebofsky
Editor, Meteorite magazine
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Hi All:
To add to Jerry's comment, we saw Vesta tonight too (along with 35
students). Tomorrow it is a little further from Jupiter (2/3 the Moon's
diameter), but is due North of Jupiter, about a bright as Callisto
(faintest of Jupiter's 4 main satellites).
Larry (just missing the rain that came
M. Robson gave a talk at MetSoc meeting here in Tucson on Thursday. There
is something less than 50 pounds accounted for (I think). I am trying to
get him to write an article for Meteorite, but it probably would not be
until the February issue.
Larry
On Sat, August 18, 2007 6:05 pm, Sterling K.
Chris beat me to this.
The scale height of Earth's atmosphere is about 6 km and Mars is about 11.
So, in the range where meteors burn up and where aerobraking is
important, th martian atmosphere is comparable to Earth's. I thought that
it was still a little thinner than Earth, but will not argue
Hi All:
My two cents.
We had are usual asteroid lunch today (discuss them and other related
topics, not eat them). I brought up this topic. Among others there was me,
an asteroid person (used to do them modeling of asteroids and, yes, they
are cold inside since the typical asteroid probably
Hi Sterling:
Thanks for the information. I am always concerned that when I teach my
intro astronomy class that I may miss the latest discoveries. I will have
to revise what I say about the Grand Canyon.
Also since I do talk about units of measurement, if there are dinosaurs
getting on the Ark,
Hal's email address was at the end of his article in Meteorite magazine in
February (and has been sent to Geoff).
On Sat, May 12, 2007 3:45 pm, Sterling K. Webb wrote:
Hi, Everybody,
Ah, this is the internet at its most typical.
Before characterizing a man's work, you really
ought to know
Hi Rob:
Let me see what I can do (should have a copy at work).
Should I ask one of the authors any questions? I will be seeing Mike
Gaffey tomorrow.
Larry
On Mon, April 16, 2007 4:48 am, Rob McCafferty wrote:
Hi list
Does anyone have access to and/or able to get me a
peek-a-boo at this
Hi all:
I am excited about the Mars CI/CM. Having studied asteroids as well as
Mars and its satellites. I have not problems with this claim. Imagine --
the first documented meteorites from either Deimos or Phobos!! The
Russians are wasting their time planning a sample return mission now that
we
Hi Mike:
It is an excellent journal, but definitely a real scientific
publication. It is very different than Meteorite magazine (I read that too
and recommend it to those of you who do not yet subscribe to it).
Larry Lebofsky
Co-Editor, Meteorite magazine
[does this make my response an Ad
Hi Dave:
My biggest criticism of many of my colleagues when they teach or go into a
classroom: they tend to get excited by the high-powered science that they
are doing and this tends to get lost on the kids. In most cases (there are
a few strange ones) most of us real scientists got excited about
Hi Mal:
We (actually Nancy) uses this at every teacher workshop that we do. It
really points out the importance of learning astronomy (or any other
science) by doing it and not just lecturing!
Larry
On Sun, April 8, 2007 8:09 am, Mal Bishop wrote:
When I Heard the Learn'd Astronomer
When
Hi Darren:
I do not disagree with you on that. From an education point of view (I am
trying to teach them astronomy), you want your students to understand what
is going on with the sky. But at the same time, you want them to
appreciate the wonders of the night sky (in this case) and with this
Hi everyone:
You should all have gotten or will soon get your February issue of
Meteorite magazine. Nancy and I have just sent off all of the articles for
the May issue to the publishers.
So, it is now time to think about the August and November issues! The
submissions deadlines for these are
Hi Jerry:
I will be there (here)! I think Anne Black is also thinking of coming.
It is a dry heat.
Larry
On Mon, March 19, 2007 6:12 am, Gerald Flaherty wrote:
Good Monday Morning List,
Dawn and I plan to attend the 2007 Meteoritical Society Meeting at Tucson
August 13-17. We expect that
Hello List:
I have observer a few asteroids in my life and have some problems with
this article. I am away from home, so I am going mostly on memory and so
these are only estimates;
1. If you are to put a telescope at the orbit of Venus, it would have to
be in the same orbit as Venus, but not
Dear Mccartney:
If you plan to go to Peru, please read the following.
http://en.wikipedia.org/wiki/Pisco_sour
When in Rome ...
This is NOT Mexico (or Texas).
Larry
On Fri, February 23, 2007 2:48 pm, McCartney Taylor wrote:
The hunt is on!
I just talked to my friend down in South America,
Hi Al and Edwin, etc.
I have in my posession an article by Doug Borgard about Port Orford. The
article will be in the May or August issue of Meteorite magazine.
Larry
On Mon, February 19, 2007 7:50 am, AL Mitterling wrote:
Hi Edwin and all,
Port Orford. I don't know if you have read any of
Hi Randall:
I will try to answer one of your questions.
I wish I could give you details on how to get meteorites off of Mars, but
this is something that I would have to talk to Jay Melosh about (if I can
keep him in place long wnough).
However, I can address the issue of asteroid/meteroid
Hi Randall and Others:
I did some checking. To quote Tim Swindle: Yes, there may be meteorites
from Venus, but we have not found them yet!
It is much more difficult to get something out of the gravity well of
Venus, through the Venus atmosphere, and out of the gravity well of the
Sun. It is much
Hi Tracy:
Yes there is!
Nangasohu Katsina, Chasing Star or Meteor Katsina
According to some Hopi this Katsina represents a planet but to many others
it is a meteor that is the Chasing Star. The Katsina wears an enormous
head dress of trailing eagle feathers, carries a yucca whip and a bell and
Hi Sterling:
I am not a munitions expert, but I think it would be more appropriate to
compare the meteoroid with a speeding bullet. The TNT energy is released
in all directions while a bullet's (or meteoroid's) energy is directional
(at the target). I have seen what the window of the Shuttle
Dear Sabrina:
Our prayers are with you and Walter.
Larry Lebofsky
(Tucson)
On Fri, February 2, 2007 4:58 am, Walter Branch wrote:
Hello,
I am Walter Branch's wife, Sabrina. On Friday, Walter and our daughter
were in an accident. Walter is in critical condition in Trauma ICU. He
has
Back in the dark ages (1950s and early 1960s), before the Dawning of the
Age of Aquarius (Which really starts somewhere between 2060 and 2100), we
were taught (and some of us even taught) that it was interesting how it
looked like South America fit into Africa and that the Pacific Ocean basin
was
Hi Darren:
Lots of other factors going on:
Extra velocity caused by the gravity of the impacted body.
Composition of the surface being hit.
Composition/density (and thus mass) of the impactor.
Surface processes that will affect the loss of craters or their just
fading away.
At some point,
Hi From (usually) warm and sunny Tucson.
First the good news:
It should be lows around 40 F (4 or 5 C) and highs around 70 (20 C) and
sunny by the weekend with little chance of rain.
That said, here is the webcam picture from the University of Arizona campus.
http://www.cs.arizona.edu/camera/
Hi All:
I sort of remembered something done on the History channel. So I did a
Google search and found:
http://video.google.com/videoplay?docid=1239210472564794775q=Tunguskahl=en
A 5-minute video on Tunguska.
In its usual style, despite interviewing several scientists including Don
Yeomans,
Hi Dave:
My last two emails to the list have failed to get through; do not know the
problem.
If you get this, but not a second copy from the list, please send it on.
We had a cold spell earlier this week (lows in the upper 20s), but it has
warmed up a bit (may get rain this weekend and I have a
Hi Jeff:
My last two emails to the listserv have failed, so this is probably only
going to you.
Nice pics, even though you have not seen the comet. we saw it the end of
last week after sunset (had the neighbors come out wondering what we were
doing) and saw it in the middle of the day on Sunday
I beg to differ, it is Gamera who shoots flames as he flies through the
Solar System.
Larry
On Tue, December 19, 2006 4:46 pm, Darren Garrison wrote:
On Tue, 19 Dec 2006 16:19:22 -0700, you wrote:
That close to Tokyo, I'd suspect Rodan or Mothra g.
Rodan? Mothra? Be serious! Those are
Hi from Tucson where Global Warming seems to be in action.
We (Astronomy Department, Planetary Sciences Department, and Flandrau
Science Center) had more than 10 telecopes set up (including two 20-inch
scopes). We were able to see all but the last five minutes of the event
(went behind the
Hi Jerry:
No. No other meteorite meetings at that time. This just happens to be the
time of year that they always hold the Meteoritical Society meeting.
It is my understanding, however, that they will have some meteorite
displays at the meeting, but I do not know the details.
Larry
On Tue,
Hi Sterling:
Derek's book is only $107.50 on Amazon.com.
I hope that Derek will be writing an article for the February issue of
Meteorite magazine.
Larry
On Tue, October 24, 2006 11:28 am, Sterling K. Webb wrote:
Hi,
For those interested in follow-up to Sears'
theories but reluctant to
Ed:
Makes sense to me. There was a giant meteor and when all of the dinosaurs
looked up at it they were blinded by the light. Made it difficult for them
to find food!
Larry
On Tue, October 17, 2006 4:25 pm, E.P. Grondine wrote:
Hi Ron -
meteor impact? Didn't any one at NSF catch this?
be worth publishing in Meteorite, please
contact me at this email address.
We are always looking for new authors and for those of you at
universities, we are seeking articles by students, too.
Larry
Larry and Nancy Lebofsky
Editors, Meteorite magazine
1371 E. Placita Mapache
Tucson, AZ 85718
Hi Darren:
Yes, you are right, but what do you expect from a reporter!
However, it you look at the animation (and given that it is a binary), you
can see the wobble of the larger mass as it is being pulled upon by the
smaller mass and the larger one precesses on its axis (they both precess)
due
Hi Mike:
Yes, this has to refer to the impact itself since when we normally use the
term, it implies something coming through the atmosphere.
As Editor, one wishes to be able to fix these things, but since it is
just a news item, I tend not to change content.
Just remember, too, this is a news
Hi Doug:
Tell this to the astronauts in their space suits.
I wish I still had access to my old thermal model programs so that I could
give you real answers, but I will do my best.
If you look up the surface temperture of the day side of the Moon, you get 107
degrees C. However, the noon
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1541 East University If you teach a man to fish,
University of Arizonayou feed
1984 UT3 Nancy R. Lebofsky, American educator [MPC 25443]
3439 Lebofsky
Quoting MexicoDoug [EMAIL PROTECTED]:
All Hail Eris ?? Does the arrogance and sophomoronic Solar System
smugness ever stop on our glorious stellar merry-go-round? Even I'm getting
dizzy from this!
Now we
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Dear Herbert:
I am sorry, but I have to disagree with you on this.
I have known Brian for years and I have a great respect for the work he and
the Minor Planets Center have done and are continuing to do.
However, Brian has been a proponent of demoting Pluto for nearly a decade. By
making
All:
10 Hygiea (cvorrect spelling, though sometimes seen as Hygeia). Nice asteroid
(on the list for dwarf planet), looked at it lots of times (C-class).
Larry
Quoting Ron Baalke [EMAIL PROTECTED]:
http://www.spaceweather.com/
SpaceWeather.com
September 12, 2006
18 PLANETS: Have you
Hi Again:
Left out a link. Someone some time ago was also asking about symbols.
http://aa.usno.navy.mil/hilton/AsteroidHistory/minorplanets.html
Larry
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Hi All:
As an asteroid scientist, I have some words for the people at the Minor Planets
(oh sorry, there are no minor planets) Small Solar System Bodies Center. I do
not wish to be barred from this listserv by using any of them.
I personally think that it is a little premature for them to be
/meteorite-list
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University of Arizona
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1541 East University If you teach a man to fish
Steve:
Pluto's thin atmosphere is nitrogen, carbon monoxide, and methane and it has a
haze layer, too. This atmosphere is getting a little thicker now even though
Pluto is moving away from the Sun, but it is thought that the atmosphere will
eventually freeze out for the winter as Pluto get
Hi Sterling:
I am so far behind in reading emails that I am now reading the most recent and
going backwards. Hence my response to your email from Wednesday.
First, with only about 425 scientists voting on the porposal Thursday, there is
now a petition for the planetary (and astronomy?)
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1541 East University If you teach a man
Hi Anne:
Please remember that many scientists [not me :0)] have something to make up
for their common sense ... their big EGOS. If you have any doubt about this,
ask Nancy.
It is the old my theory is better (bigger) than your theory. There are lots
of ways to define a planet (we have seen
,
available through amazon.com., you should buy yourself
a copy of it anyway.
good hunting,
EP
--- Larry Lebofsky [EMAIL PROTECTED] wrote:
Hi Darren:
This one I think I can answer and not get into
trouble with anyone in the
astronomy field.
Meteor shower:
Usually related
Hi all:
Defending Tim Swindle and Humberto Campins. I have known them for years and
they are very conservative scientists. Their work is good and they are well-
respected scientists. They do not go off (too often) to make wild,
unsubstantiated, claims., hence, the conclusions in their article.
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Lunar
Hi Jeff:
Read the May issue of Mereorite magazine. An article by Swindle and Campins.
Larry
Quoting Jeff Kuyken [EMAIL PROTECTED]:
Howdy Bernd, Rick all,
Just curious because I recently read somewhere (maybe this list actually but
can't remember) that the CH (or CB?) chondrites may now
Hi Darren:
This one I think I can answer and not get into trouble with anyone in the
astronomy field.
Meteor shower:
Usually related to a comet (or sometimes asteroid; extinct comet??) or
sometimes not (comet long gone). Comets have tails. This material is small
(look at Stardust) and
Sterling:
Well, much of the controversy started when that planetarium in New York found
that it could not fit Pluto into its display because it was too far from the
Sun to fit in the exhibit hall. There were a number of articles about this at
the time.
Beign a scientist I did a scientific
Hi all:
This is why there is an IAU nomenclature committee. It prevents chaos when
naming asteroids, comets, satellites, and now planets, I guess.
Larry,
asteroid 3439 Lebofsky
Quoting Darren Garrison [EMAIL PROTECTED]:
On Thu, 17 Aug 2006 22:59:55 -0400, you wrote:
Oh... Why name
nomenclature.
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-hydrostatic equilibrium shape.
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As long as Rob Britt quotes me correctly and not out of context, I am happy to
be worked by him.
By the way, there are a good number of real astronomers who are making very
strong comments about this resolution. I am not sure that I have ever seen so
many egos coming out (I trust me and thee
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Lunar and Planetary Laboratory you feed him for a day
Hi again Darren:
Mike Brown makes some interesting and valid points. Others have too. No system
is going to be perfect. We are dealing with Mother Nature and she has her own
rules.
However, I am confused by some of what he says. He says that he had nothing to
do with the writing of the
the idea of using
roundness as a determining factor.
The IAU proposal will be voted on by IAU
members Aug. 24.
It all just might work, Marsden said.
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Senior Research Scientist
Co-editor, Meteorite If you give a man a fish,
Lunar
. Larry A. Lebofsky
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University of Arizona
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1541 East University
Hi Daren:
I am reading these backwards, so have waded through Sterling's comments.
Again, I was not on the committee, but have been (because of the Division for
Planetary Sciences Committee) briefed by Rick Binzel who was on the
committee and who we questioned.
Plutons: a class of planets.
Darren:
We were getting ready to redo a kids video we did years ago and now we have to
add three new planets (one without a name yet).
Larry
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can they miss it).
Chris, if you want to continue this discussion offline, please feel free to
contact me.
Larry
--
Dr. Larry A. Lebofsky
Senior Research Scientist
Co-editor, Meteorite If you give a man a fish,
Lunar and Planetary Laboratory you feed him
Hi Darren:
I promised myself to not be the one to send out a dozen emails on a subject,
but I seem to be breaking my own promise.
I do not have the information in front of me, but will attempt to contact the
person who knows the answer. (how big of an object can still be out there and
not
@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
--
Dr. Larry A. Lebofsky
Senior Research Scientist
Co-editor, Meteorite If you give a man a fish,
Lunar and Planetary Laboratory you feed him for a day.
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