UNT astronomers say they found 2 samples of meteorites near WEST, TX 18FEB09

UNT astronomers say they found 2 samples of meteor
By REGINA L. BURNS Associated Press Writer © 2009 The Associated Press
Feb. 18, 2009, 10:52PM
houston_chron196:http://www.chron.com/disp/story.mpl/buzz/6270243.html

DALLAS — Two samples of fresh material the "size of large pecans" from a meteor that alarmed numerous residents when it streaked across the Texas sky on Sunday have been found by two University of North Texas astronomers in a pasture east of the small town of West.
"The pieces that we found have beautiful ablation crust. And it's black like charcoal. Underneath this crust the color of the rock is concrete like gray," said Ron DiLulio, director of the planetarium and astronomy lab program at the University of North Texas in Denton.
DiLulio and Preston Starr, UNT's observatory manager, said they found the pieces Wednesday about 5 p.m. after starting their search from Fort Worth at 3 a.m. using calculations from all of the calls they had received.
DiLulio said they had just about given up looking and were driving back when a friend called and asked to meet them at a certain intersection. They said that coincided with conversations they had had earlier that day with citizens at a restaurant.
"We decided rather than try to get permission from landowners, there would be pieces in a line that would spread out a mile across. We decided to just do the county roads and we just started walking down that road and it's fairly easy to see. It jumped out at us within 15 minutes," DiLulio said.
"We came back to where our gut instinct told us," Starr said. He said the McLennan County sheriff and deputies confirmed what citizens had told them.
"The sheriff told his deputy to take us out there," DiLulio said.
The astronomers placed the samples in ZipLoc bags to keep out the air. They plan to transfer the samples to membrane cases and take them to the university for additional study.
People on Sunday reported seeing a fireball streak across the sky and DiLulio said the reason it created such a fireball was because the meteor expanded and broke into pieces.
The pair said they were not alone in the search and ran into others including "a commercial meteorite hunter and we wanted to get there so we could have it first for science," DiLulio said.
Starr said the pair had been gathering information since they initially learned of the meteor's appearance.
"We did a lot of pre-planning. We looked at the angles of what they saw in the sky and we were able to map it all out. We put a plan together and we drove around small country roads. Texas has lots of small farm to market roads," Starr said.
DiLulio said he thinks there are larger pieces still to be found.
"We feel that there are probably several hundred pieces. What happens when these things fall — they may break apart. We want to find these early and study the primitive material before our atmosphere affects them," DiLulio said
He said the pair planned on returning to the areas where they had searched.
"Everytime we find one we mark where it is on the map and we can measure how much material actually hit the surface of the earth," DiLulio said.
West is about 70 miles south of Dallas.
____
On the Web:
University of North Texas, http://www.unt.edu/

COMET LULIN & SATELLITE DEBRIS UPDATES

Space Weather News for Feb. 18, 2009http://spaceweather.com

COMET LULIN UPDATE: Comet Lulin is approaching Earth and brightening rapidly. Observers say it is now visible to the naked eye as a faint (magnitude +5.6) gassy patch in the constellation Virgo before dawn. Even city dwellers have seen it. Backyard telescopes reveal a vivid green comet in obvious motion. Just yesterday, amateur astronomers watched as a solar wind gust tore away part of the comet's tail, the second time this month such a thing has happened. Lulin's closest approach to Earth (38 million miles) is on Feb. 24th; at that time the comet could be two or three times brighter than it is now.
Browse the gallery for the latest images: http://spaceweather.com/comets/gallery_lulin_page8.htm

SATELLITE DEBRIS: More than a week has passed since the Feb. 10th collision of Iridium 33 and Kosmos 2251 over northern Siberia, and the orbits of some of the largest fragments have now been measured by US Strategic Command. Today's edition of http://Spaceweather.com features global maps showing where the debris is located. Only 26 fragments are currently plotted, but that number will grow as radar tracking of the debris continues. Check back often for updates.

Closing in on the Texas Meteorite Strewnfield??? 18FEB09

"Alright I agree that the Austin, Waco, Dallas event was one event and was not satellite debris." ...
The radar tracks you referenced are great Ed. They show any meteorites would have landed about 5 kilometers SE of Lake Whitney. Although the altitude differences cause a large spread over the possible impact zone. The Fort Worth Radar (which I can see from my house) would have imaged the one on the right first and the one on the left second. The Granger radar would have imaged the lower altitude first and the higher altitude second, so yes it would have been a reflection off an Ionization trail. The images would have been about a second and 6 degs of scan apart. My belief they were separate parts of something come from early reports from McKinney saying it was seen in the north. In the police dash cam from plano it appears to be going north to south in a more vertical direction and very high in the sky. Reports from Denton also put it very high in the sky (still confused about how this could be). The Austin video was suppose to be taken looking north giving a fall area around Marble Falls. So it must have been taken NE or ENE to give the low trajectory and east to west appearance. There is no way an object 9,000 feet off the ground can be seen from 120 miles away, so it must have been over Hearn area from the Austin video. It would be interesting to hear more reports from the Whitney, West, Mart area to try and determine if there are any possible meteorites from this one.
Not likely to start any search parties like the Canadian bolide did though....

Source: Pat Branch, TX, USA

Recent Impact Papers Available 16FEB09

Below are some recent papers about impact structures and alleged impactites that have appeared.
1. Schmieder, M., E. Buchner, and D. P. LeHeron, 2009, The Jebel Hadid structure (Al Kufrah Basin ,SE Libya)—A possible impact structure and potential hydrocarbon trap? Marine and Petroleum Geology. vol 26. no. 3, pp. 310-318. doi:10.1016/j.marpetgeo.2008.04.003
http://dx.doi.org/10.1016/j.marpetgeo.2008.04.003

The Jebel Hadid structure is formed in the Nubian Sandstone and located in southern Al Kufrah Basin. It is a 4.7 km circular feature with a set of multiple concentric annular ridges. they suggest "that the Jebel Hadid structure might represent an eroded, complex impact structure' much like the Tin Bider structure in Algeria. Its location is 20º 52' N and 22º 42' E).

2. Ghoneim, E. M., 2008, Ibn-Batutah: A possible simple impact structure in southeastern Libya, a remote sensing study. Geomorphology. vol. 103, no. 3, pp. 341-350. The Ibn-Batutah feature is a circular structure centered on 21° 34′ 10″ N and 20° 50′ 15″ E and located in southeastern Libya. It is formed in Nubian Sandstone.
http://dx.doi.org/10.1016/j.geomorph.2008.07.005http://www.bu.edu/remotesensing/faculty/research/ghoneim/index.html

3. McCall, G. J. H., 2009, Half a century of progress in research on terrestrial impact structures: A review. Earth-Science Reviews.vol 92, no. 3-4, pp. 99-116.
http://dx.doi.org/10.1016/j.earscirev.2008.11.004

4. McCall, G. J. H., in press, The Carbonado diamond conundrum Earth-Science Reviews, In Press, Accepted Manuscript, Available online 13 February 2009. doi:10.1016/j.earscirev.2009.01.002
http://dx.doi.org/10.1016/j.earscirev.2009.01.002

"The reviewer presents the results of a literature search on the enigmatic occurrences of carbonado; a form (but not the only form) of polycrystalline diamond, which is mined for industrial diamonds." He hypothesizes that "carbonado does stem from terrestrial eruptive processes" and concludes that much research remainsto be performed before any conclusions can be reached.5. Schmieder, M., and E. Buchner, 2007, Short note: The Fayabasin (N Chad, Africa) – A possible impact structure? Journal of African Earth Sciences. vol. 47, pp. 62–68.The Faya basin is an almost circular structure, centered on 18º 10' N and 19º 34' E. It lies about 55 km ENE of the city of Faya (Largeau) and has a diameter of about 2 km.
"http://dx.doi.org/10.1016/j.jafrearsci.2006.11.004http://adsabs.harvard.edu/abs/2007JAfES..47...62S

Source: Paul V. Heinrich, Baton Rouge, LA, USA

Information on Two Recent Meteorites Recovered from Falls 17FEB09

People may be interested in two announcements of recent falls in the Meteoritical Bulletin and associated LPSC abstracts:

Buzzard Coulee, Canada (which everybody knows about):
http://tin.er.usgs.gov/meteor/index.php?code=48654http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1893.pdfhttp://www.lpi.usra.edu/meetings/lpsc2009/pdf/2072.pdf

Bunburra Rockhole

31°21.0′S, 129°11.4′E

Nullarbor Region, South Australia, Australia

Fall: 21 July 2007 :
http://tin.er.usgs.gov/meteor/index.php?code=48653http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1664.pdfhttp://www.lpi.usra.edu/meetings/lpsc2009/pdf/1498.pdf

Source: Dr. Jeffrey N. Grossman
phone: (703) 648-6184
US Geological Survey
fax: (703) 648-6383954
National CenterReston, VA 20192, USA

Italian Fireball makes THREE for 13~15FEB09

Italian Fireball 13FEB09 Photo by: Diego Valeri (c) 2009
The evening of Friday 13 two stations of the Italy center have recorded a large fireball of mag -16/-17!!! ( The hour is in UT )
Possible the fall on the Earth of a meteorite. Moreover in the same timetables have been observed others 5/6 fireball to the north and center Italy.
The radiating is in:
AR. = 159.4 degree
Dec. = 22.2 degree
The radiating is in Antihelion (Delta Leonids).
Source: Roberto Haver, Italy
---
Well, in the evening (2009, Febrary 13th, at 20:03:29±1 U.T.), over CentralItaly,a very bright fireball was detected from Rieti.

In the link, posted by Roberto Haver, you have a fireball frame image:

http://img11.imageshack.us/img11/84/m20090213200329contiglihd3.jpg

The apparente magnitude was -16.9±2.7 and its time of transit was 6.2±0.1 s.

High probability of impact to ground. We're computing the possible point of intersection with Earth, from video records.
Source and Photo Credits: Diego Valeri

Other recent events were 13Feb09--Kentucky, USA
Austin, Texas 11:20CST 15FEB09

Fireball Over Texas 15FEB09

Fiery debris seen in Texas skies not from satellite collision, officials say11:20 PM CST on Sunday, February 15, 2009 By RUDOLPH BUSH / The Dallas Morning News

Fiery debris burned through the Texas sky Sunday morning, alarming some and enchanting others but resulting in no apparent injury or damage. Video from Dallas to Austin and beyond, sightings were reported of a red and orange fireball with a small black center speeding toward Earth before burning out in a trail of lingering white smoke. Roland Herwig, spokesman for the Federal Aviation Administration’s southwest division, said the fireball was probably superheated debris from a broken satellite falling to Earth.The FAA could not directly link the debris to the reported collision last week of Russian and U.S. communications satellites, however. “It’s yet to be proved it’s those satellites,” Herwig said. However, a spokeswoman for U.S. Strategic Command said the fireball spotted in the Texas skies Sunday was unrelated to the satellite collision. Air Force Major Regina Winchester said that Joint Space Operations Center at California’s Vandenberg Air Force Base has been monitoring the debris from the collision, and that could not have caused the dramatic sight. She also said the fireball was not related to the estimated 18,000 man-made objects that the center also monitors. “There was no predicted re-entry,” Winchester said about the objects in Earth’s orbit.She said it could possibly have been a natural phenomenon such as a meteorite. It’s unclear exactly how many pieces of debris tumbled toward Texas or whether any more are on the way.The potential danger from debris did prompt the FAA to warn pilots nationwide to be aware of the hazard and to immediately report any sightings. State emergency management officials and local law enforcement agencies also were on alert across much of Texas. Based on reports of a fireball near Waco, local law enforcement officers searched for debris but found nothing, a Texas Department of Public Safety spokeswoman said. Though no one could pinpoint where the debris fell or if it even remained intact through the burnout, the fireball left an impression on those who saw it. They say it burned anywhere from a few seconds to nearly a minute. And in some areas, particularly in East Texas, there were reports of a sonic boom. While it may not be clear for some time what fell from the sky, it seemed to be a singular event.Most sightings in Texas were reported about 11 a.m. Some people thought it was a meteor. Others thought perhaps it was a plane crashing. Doug Schmidt of Richardson was driving south on Central Expressway near the Bush Turnpike when he saw a flash of light in the sky. “It was like a ball of flame with a tail. It looked like a meteor,” he said. “There was flame and then a flash and smoke trailing it. I said ‘Wow, look at that.’ ”Farther south, in Ovilla, Chris Weaver said he stepped outside and just by chance looked south. That’s when he saw a flash of orange moving fast in the sky before burning into a streak of white smoke. “If you were looking up at the southern sky, you couldn’t miss it,” he said. There have been scattered reports across the country of debris falling to Earth since the Russian and U.S. satellites collided Tuesday about 500 miles above Earth. The collision occurred over Siberia and sheared thousands of shards of debris through Earth’s orbit.Pieces of that debris will continue to float through orbit for thousands of years or more, while other pieces will at times fall to Earth, probably likely burning up as they pass through the atmosphere, experts say.

Staff writer Jeff Mosier and The Associated Press contributed to this report.

SOURCE: http://www.quickdfw.com/sharedcontent/dws/news/localnews/stories/021609dnmetdebris.1c083e1f.html

---

Update 16FEB09:

Limestone County sheriff's office reported contact from someone who claimed to have a picture of the fireball and a smoke trail and a Plano,Texas, police cruiser may have capture images from a dashboard camera.

http://www.spaceflightnow.com/news/n0902/15debris/

---

Date: Monday, February 16, 2009, 6:44 PM

What must be sonic booms were reported in Hill and Navarro counties, south of Dallas, Texas. Two towns named in one TV story (a Fox station in the Dallas, Texas, area) where sonic booms were heard were Hubbard and Penelope.

One private report I've seen mentions what I guess was a smoke trail that lasted about ten minutes. That report said the fireball was visible for about eight seconds and that it was going south to north when seen to the east of Austin. Another report from people who apparently were in a car says they saw going NNE while they were traveling northeast.

This was a significant fireball, and I hope another video was made from somewhere. I saw a mention that a police-car dashboard camera may have captured it. This was at 11:00 AM local time -- broad daylight. By the way, online reports now cite the FAA and STRATCOM as saying it was a nature event completely unrelated to the collision of the satellites. I would tend to thank that this might have been detected by a DSP satellite, but if so we might never hear about it.

Source: Ed Cannon - Austin, Texas, USA

---

Other Report:

Astronomer Bill Cooke of NASA's Meteoroid Environment Office is stating that this event was asteroid of about 1 meter, 20 Km/s.

Source: Space weather.

---

UPDATE 17FEB09

Two local TV weather blogs have radar images from 11:03 AM (local, 17:03 UTC) Sunday that show two echoes, one in southern Hill County near Hubbard and another, larger one in the northern corner of McLennan County (Waco), just north of the small town of West and south of the small town of Abbott in Hill County.

They both agree that in one pair of images from Fort Worth radar the right-hand or eastern echo is higher in the atmosphere than the larger one to its left. They say that the one of the left was at about 4,000 feet and the one one the right at about 7,000 feet above the ground. I assume these are echoes of a smoke or debris trail, but maybe they could be plasma (?).

I don't know why there are two separate echoes. I believe that weather radars rotate once per minute. In the KVUE-24 blog, there are two pairs of images, each from a different radar center, and the altitudes of the echoes are given different altitudes for the Granger radar than for the radar from Fort Worth.

However, in this one it appears that the blogger or his source has mis-stated (reversed) the altitudes of the echoes in the second pair of images (from Granger radar).

Here are links:"Sunday Fireball Seen on Radar" (KXAN-36, NBC affiliate, Jim Spencer)http://blogs.kxan.com/weather/2009/02/16/sunday-fireball-seen-on-radar/

"Meteor Captured on Radar" (KVUE-24, ABCaffiliate, Mark Murray)http://www.beloblog.com/KVUE_Blogs/weatherblog/

Now, here is a second-hand report from an eyewitness in Hearne, Robertson County, Texas, who reports that the fireball went near the zenith, lasted about 10 seconds, and lit up the ground in broad daylight: http://www.satobs.org/seesat/Feb-2009/0354.html

From Hearne to West in McLennan County yields a more or less SSE to NNW track, and the two radar echoes seem to have it descending as it went in that direction. I've read one report in which the eyewitness says she saw five streaks. Another story on one of those websites says that so many 911 calls were received in Williamson County (immediately north of Austin) that they sent out a helicopter to search for a fallen aircraft. It would be very nice, if this was detected by DSP satellite, if they would report it as has been done in the past (several years ago).

Ed Cannon - Austin, Texas, USA

Kentucky Fireball 13FEB09

KENTUCKY FIREBALL: On Friday, Feb. 13th, around 10:00 pm EST, people in central Kentucky heard loud booms, felt their houses shake, and some saw a fireball streaking through the sky. The nature of this event is still under investigation. Possibilities include a small asteroid or a piece of space junk entering Earth's atmosphere. National Weather Service reports that the fireball was debris from the Feb. 10th collision of Iridium 33 and Kosmos 2251 satellites may be premature. Stay tuned for updates.
http://www.spaceweather.com/

A colleague just called reporting a possible fireball over Erlangen, Kentucky at 10:04PM Eastern Daylight tonight 13 Feb 2009. She was not the direct observer but relaying details from a relative who made the observationA greenish-white fireball approximately 2/3rd the diameter of the full moon was observed through a south southeastern facing window falling near vertically. No Magnitude estimate other than "it lit up the room" and "moving very fast". Elton
[meteorite-list] Fireball Alert: North Central Kentucky

UPDATE:
I've spent several hours going over internet forums, scanner reports, etc. and the preponderance of sonic boom reports are coming from London, KY. Some reports from Richmond, KY to the North of London.
Visual Observers have been mentioned from Southern Ohio, Central Kentucky, Middle Tennessee, and Western South Carolina. Those with detail seem to confirm this was a steeply vertical track. Based on what I have gleaned, and trying to be conservative, nothing thus far precludes that this could have been a meteorite dropping fireball. When/if we get satellite observation data please give me a heads up.
London is on Interstate 75 near the Tennessee state line North of Jelico, TN west of Middlesboro, KY. South of Lexington KY. I am about 100 miles away in Knoxville. I'm putting together a resource pack to take to the London Corbin area Tuesday. If anyone is headed to the area please let me know so we can coordinate.
Source: Elton Jones, USA

UPDATE 17FEB09

The Kentucky fireball Friday night (9:00 PM Central,10:00 PM Eastern on 13 February; 03:00 UTC Feb 14) was observed from at least four states: Kentucky, Ohio, Tennessee, and West Virginia.

The following blog has some reports and a map of report locations:
http://transientsky.wordpress.com/2009/02/16/feb-13th-kentucky-fireball/

It seems to have been going east to west. One good report from Owensboro, KY, says that from there it appeared at 45 degrees altitude, disappeared at 15 degrees, and (if I understand correctly) was going almost straight down. This observer estimates the magnitude at -6 to -7 -- from west central Kentucky.

The following site has some reports from southeast Tennessee:
http://www.wbir.com/news/local/story.aspx?storyid=78000&catid=2
Source: Ed Cannon - Austin, Texas, USA

Buzzard Coulee, Canada OC H4 Classification Announced 12FEB09

The Buzzard Coulee, Canada meteorite which fell in late 2008 has been classified as an H4 Ordinary Chondrite in a recently released paper:
http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1893.pdf

Iridium Satellite Space Crash May Produce Future Meteors? 11FEB09

http://www.nytimes.com/2009/02/12/science/space/12satellite.html?hp

Debris Spews Into Space in Collision of Satellites

By WILLIAM J. BROAD

Published: February 11, 2009

For decades, space experts have warned of orbits around the planet growing so crowded that two satellites might one day slam into one another, producing swarms of treacherous debris. It happened Tuesday. And the whirling fragments could pose a threat to the International Space Station, orbiting 215 miles up with three astronauts onboard, though officials said the risk was now small. “This is a first, unfortunately,” Nicholas L. Johnson, chief scientist for orbital debris at the National Aeronautics and Space Administration, said of the collision. It happened some 490 miles above northern Siberia, at around noon Eastern time. Two communications satellites — one Russian, one American — cracked up in silent destruction. In the aftermath, military radars on the ground tracked large amounts of debris going into higher and lower orbits. “Nothing to this extent” has ever happened before, Mr. Johnson said. “We’ve had three other accidental collisions between what we call catalog objects, but theywere all much smaller than this,” the objects always very small and moderate insize.The communication satellites, he added, “are two relatively big objects. ”The American satellite was an Iridium, one of a constellation of 66 space craft. Liz DeCastro, corporate communications director of Iridium Satellite, based in Bethesda, Md., said that the satellite weighed about 1,200 pounds and that itsbody was more than 12 feet long, not including large solar arrays.In a statement, the company said that it had “lost an operational satellite” on Tuesday, apparently after it collided with “a nonoperational” Russian satellite. “Although this event has minimal impact on Iridium’s service,” the statement added, “the company is taking immediate action to address the loss. ” The company’s hand-held phones can be used anywhere around the globe to give users voice and data communications. Mr. Johnson said the Russian satellite was presumably nonfunctional. Officials at the Russian Embassy in Washington could not be reached for comment. Mr. Johnson said the United States military’s tracking radars had yet to determine the number of detectable fragments. “It’s going to take a while,” he said. “It’s very, very difficult to discriminate all those objects when they’re really close together. And so over the next couple of days we’ll have a much better understanding.”At a minimum, Mr. Johnson added, “I think we’re talking many, many dozens, if not hundreds.” The debris could threaten the space station and its astronaut crew, he said. “There are actually debris from this event which we believe are going through space station altitude already,” he said. The risk to the station, Mr. Johnson added, “is going to be very, very small.” In the worst case, he said, “We’ll just dodge them if we have to. It’s the small things you can’t see that are the ones that can do you harm. ”In Houston, International Space Station controllers have often adjusted its orbit to get out of the way of speeding space debris, which can move so incredibly fast that even small pieces pack a destructive wallop. John Yembrick, a NASA spokesman in Washington, said the agency now judged therisk of collision with the speeding fragments to be “very small.” The threat, headded, is defined and acceptable. Mr. Johnson, who works at the Johnson Space Center in Houston, said the new swarms of whirling debris might also eventually pose a threat to other satellites in an orbital chain reaction. “What we’re doing now is trying to quantify that risk,” he said. “That’s a workin progress. It’s only been 24 hours. We put first things first,” meaning the station and preparing for the next shuttle mission.

William Harwood contributed reporting

Bolides and Meteorite Falls Conference- Announced for May 10-15, 2009 Prague, Czech

Invitation to the Bolides and Meteorite Falls Conference
held in Prague, Czech, May 10-15, 2009 http://www.bolides09.com/

Dear All,
We would like to take this advantage and to invite you to wonderful spring Prague to meet other colleagues, to share your experiences and to celebrate with us the 50th anniversary of the Pribram meteorite fall.
The Pribram meteorite fall on April 7, 1959 was the first scientifically observed meteorite fall. The associated bolide was captured by the photographic cameras of the double-station meteor observation program initiated and led by the Czech astronomer, Zdenek Ceplecha, who also analyzed all the available data and predicted the location of the meteorites.
To date there have been only 9 cases where a meteorite dropping bolide was observed instrumentally, so that the trajectory and orbit could be determined precisely and – at the same time – the meteorite was recovered.
Nevertheless, thanks to various observational programs and modeling efforts, our understanding of bolides and associated phenomena has increased dramatically over the past 50 years.
We believe, that the conference will be devoted not only to celebrating the anniversary, but also to offer a forum to discuss recent achievements in this field and future programs.
We are looking forward to meeting you in Prague!
On behalf of the Organizing Committee,
Pavel Spurny--Astronomical Institute of the Academy of Sciences of the Czech Republic
Jiri Borovicka--Astronomical Institute of the Academy of Sciences of the Czech Republic
Committee & Contacts
General Information
Conference Schedule
Scientific Topics
Accommodation
Program
Social program
On-line abstract submission
On-line registration
On-line accommodation
Links
Important dates

Buzzard Coulee, CANADA update 10FEB09

Security cameras caught asteroid fireball
By Rod Nickel, Saskatchewan News Network February 10, 2009
"Security camera footage from a gas station and motel has proven the best tool for researchers to learn the origins of a 15-tonne asteroid that lit up the Prairie sky on Nov. 20. As the asteroid broke apart, it became a giant fireball visible from northern Alberta to Manitoba. Searchers have found pieces in an area southeast of Lloydminster, specifically on a slough called Buzzard Coulee.".... Whole Story at:
http://www.leaderpost.com/Technology/Security+cameras+caught+asteroid+fireball/1271726/story.html

Related Story with camera photo of the fireball:
http://www.canada.com/Technology/Security+camera+footage+understanding+meteorite+origins/1270948/story.html

COMET LULIN UPDATE 8JAN09

COMET LULIN UPDATE 8JAN09

COMET LULIN UPDATE: The plasma tail of Comet Lulin, torn off by a solar wind gust on Feb. 4th, has already grown back. Also, observers in dark-sky locations report that the comet is now visible to the naked eye as a pale "fuzzy patch" in the constellation Libra before dawn. The comet is brightening as it approaches Earth for a 38-million-mile close encounter on Feb. 24th. See the latest images in the Comet Lulin Photo Gallery: http://spaceweather.com/comets/gallery_lulin_page7.htm

Space Weather News for Feb. 8, 2009
http://spaceweather.com

DUSKY LUNAR ECLIPSE: On Monday, 9FEB09

DUSKY LUNAR ECLIPSE:
On Monday, Feb. 9th, the full Moon will pass through the outskirts of Earth's shadow, producing a penumbral lunar eclipse. The event will be visible to the naked eye as a dusky shading of the northern half of the Moon. Maximum eclipse occurs between the hours of 1400 and 1520 UT (6:00 am - 7:20 am PST). The timing favors observers in east Asia, Australia, Hawaii and western parts of North America.
Visit http://spaceweather.com for a visibility map, animations, and more information.

New Scientist" Commentary About Younger Dryas Impact Hypothesis 8JAN09

New Scientist" Commentary About Younger Dryas Impact Hypothesis 8JAN09

Beware Earth-shattering Headlines
04 February 2009 by Jeff Hecht
Magazine issue 2694.
"FEW editors can resist a disaster story, even one that happened in the distant past. So it is little wonder that the press jumped all over claims by a team of 25 researchers in 2007 that a mysterious impact on the North American ice sheet 12,900 years ago wiped out the continent's Pleistocene megafauna and the Clovis culture of the early settlers, and wreaked havoc on the global climate. The researchers claim a comet collision triggered wildfires across the continent and a sudden cooling known as the Younger Dryas event. If correct, the theory could help resolve a long-running debate over whether climate change or the first human settlers killed off the mammoths and other ice-age giants"....for the rest of the story:
http://www.newscientist.com/article/mg20126947.000-beware-earthshattering-headlines.html

Papers Dispute the Existence of Wildfires with Start of Younger Dryas 7FEB09

Two papers, both of which dispute the occurrence of wildfires associated with a hypothetical impact event at the start of the Younger Dryas, have been recently published.

They are:
1. Marlon, J. R., P. J. Bartlein, M. K. Walsh, S. P. Harrison, K. J. Brown, M. E. Edwards, P. E. Higuera, M. J. Power, R. S. Anderson, C. Briles, A. Brunelle, C. Carcaillet, M. Daniels, F. S. Hu, M. Lavoie, C. Long, T. Minckley, P. J. H. Richard, A. C. Scott, D. S. Shafer, W. Tinner, C. E. Umbanhowar, Jr., and C. Whitlock, 2009,
Wildfire responses to abrupt climate change in North America.
Proceedings for the National Academy of Science.
Published online before print February 3, 2009, doi: 10.1073/pnas.0808212106
Abstract at:
http://www.pnas.org/content/early/2009/02/03/0808212106.abstract

and

2. van der Hammen, T. and B. van Geel, 2008,
Charcoal in soils of the Allerød-Younger Dryas transition were the result of natural fires and not necessarily the effect of an extra-terrestrial impact. Netherlands Journal of Geosciences (Geologie en Mijnbouw) vol. 87, no. 4, pp. 359-361.
PDF file at:
http://www.imep-cnrs.com/docu/charcoal.pdfhttp://www.njgonline.nl/publish/articles/000404/english.html

A paper about the role of climatic change unrelated to extraterrestrial impacts in wildfire synchrony is:

Kitzberger, T., P. M. Brown, E. K. Heyerdahl, T. W. Swetnam, and T. T. Veblen, 2007, Contingent Pacific–Atlantic Ocean influence on multicentury wildfire synchrony over western North America.
Proceedings of the National Academy of Sciences of the United States of America. vol. 104 , no. 2.pp. 543-548.
Abstract at:
http://www.pnas.org/content/104/2/543.abstract

Source: Paul Heinrich. LA, USA

Near-Earth Astroids PHAs 6FEB2009

Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
http://spaceweather.com/

On February 6, 2009 there were 1022 potentially hazardous asteroids.
Feb. 2009 Earth-asteroid encounters:
Asteroid//Date(UT)//Miss Distance//Mag.//Size
2009 BK58//Feb. 2 //1.7 LD//17//30 m
2009 BW2//Feb. 5 //8.4 LD//20//40 m
2009 BE58//Feb. 10 //8.6 LD//16//225 m
2006 AS2 //Feb. 10//9.2 LD//15//370 m
2009 BL58 //Feb. 11//4.8 LD//17//55 m
1999 AQ10 //Feb. 18//4.4 LD//13//390 m

Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.

Comet Lulin (C/2007 N3) Loses Part of Its Tail

Photo credit: Ernesto Guido, Giovanni Sostero & Paul Camilleri [more]

Space Weather News for Feb. 5, 2009
http://spaceweather.com/

COMET TAIL: Comet Lulin (C/2007 N3) is approaching Earth and putting on a good show for amateur astronomers. Yesterday, Feb. 4th, observers witnessed a "disconnection event." A gust of solar wind tore off part of the comet's tail in plain view of backyard telescopes. Photos of the event are featured on today's edition of http://spaceweather.com/.
Activity in the comet's tail and atmosphere will become even easier to see in the weeks ahead as Lulin nears closest approach on Feb. 24th. At that time the comet will lie only 38 million miles from Earth and it should be visible to the naked eye. In the meantime, please note that Feb. 5th-7th, is an especially good time to find Comet Lulin in the pre-dawn sky. The comet is gliding beautifully close to the naked-eye double star Zubenelgenubi. Just point your binoculars at the double star and the comet will materialize right beside it.
Visit http://spaceweather.com/ for photos, sky maps and more information.

Russian Fireball Photo by Mikhail Maslov, Russia 2009

Meteor Photo CVBS-(071214)-n01-down.jpg 2009/01/16
Photo Credit: Mikhail Maslov, Russia
Jan 16/17 2009 12:08-22:56

Comet Lulin-Green Comet Approaches Earth 4FEB09

Photo by Jack Newton 2009 (c)

http://science.nasa.gov/headlines/y2009/04feb_greencomet.htm
Green Comet Approaches Earth
NASA Science news02.04.2009 February 4, 2009:

In 1996, a 7-year-old boy in China bent over the eyepiece of a small telescope and saw something that would change his life--a comet of flamboyant beauty, bright and puffy with an activetail. At first he thought he himself had discovered it, but no, helearned, two men named "Hale" and "Bopp" had beat him to it. Mastering his disappointment, young Quanzhi Ye resolved to find his own comet one day.And one day, he did. Fast forward to a summer afternoon in July 2007. Ye, now 19 years old and a student of meteorology at China's Sun Yat-sen University, bent over his desk to stare at a black-and-white star field. The photo was taken nights before by Taiwanese astronomer Chi Sheng Lin on "skypatrol" at the Lulin Observatory. Ye's finger moved from point to point--and stopped. One of the stars was not a star, it was a comet, and this time Ye saw it first.Comet Lulin, named after the observatory in Taiwan where the discovery-photo was taken, is now approaching Earth. "It is a green beauty that could become visible to the naked eye any day now," says Ye. Amateur astronomer Jack Newton sends this photo from his backyard observatory in Arizona: http://science.nasa.gov/headlines/y2009/images/greencomet/Jack-Newton1.jpg

"My retired eyes still cannot see the brightening comet," says Newton,"but my 14-inch telescope picked it up quite nicely on Feb. 1st."The comet makes its closest approach to Earth (0.41 AU) on Feb. 24,2009. Current estimates peg the maximum brightness at 4th or 5th magnitude, which means dark country skies would be required to see it.No one can say for sure, however, because this appears to be Lulin's first visit to the inner solar system and its first exposure to intense sunlight. Surprises are possible.Lulin's green color comes from the gases that make up its Jupiter-sized atmosphere. Jets spewing from the comet's nucleus contain cyanogen (CN:a poisonous gas found in many comets) and diatomic carbon (C2). Both substances glow green when illuminated by sunlight in the near-vacuum ofspace.In 1910, many people panicked when astronomers revealed Earth would passthrough the cyanogen-rich tail of Comet Halley. False alarm: The wispy tail of the comet couldn't penetrate Earth's dense atmosphere; even it if had penetrated, there wasn't enough cyanogen to cause real trouble. Comet Lulin will cause even less trouble than Halley did. At closest approach in late February, Lulin will stop 38 million miles short of Earth, utterly harmless.To see Comet Lulin with your own eyes, set your alarm for 3 am. The comet rises a few hours before the sun and may be found about 1/3rd of the way up the southern sky before dawn. Here are some dates when it is especially easy to find:
sky map

Feb. 6th:
Comet Lulin glides by Zubenelgenubi, a double star at the fulcrum of Libra's scales. Zubenelgenubi is not only fun to say (zuBEN-el-JA-newbee), but also a handy guide. You can see Zubenelgenubi with your unaided eye (it is about as bright as stars in the Big Dipper); binoculars pointed at the binary star reveal Comet Lulin in beautiful proximity.
[sky map]

Feb. 16th:
Comet Lulin passes Spica in the constellation Virgo. Spica is a star of first magnitude and a guidepost even city astronomers cannotmiss. A finderscope pointed at Spica will capture Comet Lulin in the field of view, centering the optics within a nudge of both objects. [skymap ]

Feb. 24th:
Closest approach! On this special morning, Lulin will lie just a few degrees from Saturn in the constellation Leo. Saturn is obvious to the unaided eye, and Lulin could be as well. If this doesn't draw you out of bed, nothing will.
[sky map]

Ye notes that Comet Lulin is remarkable not only for its rare beauty,but also for its rare manner of discovery. "This is a 'comet ofcollaboration' between Taiwanese and Chinese astronomers," he says. "The discovery could not have been made without a contribution from both sides of the Strait that separates our countries. Chi Sheng Lin andother members of the Lulin Observatory staff enabled me to get the images I wanted, while I analyzed the data and found the comet."Somewhere this month, Ye imagines, another youngster will bend over an eyepiece, see Comet Lulin, and feel the same thrill he did gazing at Comet Hale-Bopp in 1996. And who knows where that might lead...?"I hope that my experience might inspire other young people to pursue the same starry dreams as myself," says Ye.