S&T's Weekly Bulletin: Revolutionary Meteorite Find, The Remarkable Asteroid 2008 TC3

I received Sky & Telescope's Weeklly Bulletin and in it was this link to their article.
- LRK -
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Catch a Falling Star
The Remarkable Asteroid 2008 TC3
March 25, 2009
Last December a determined U.S. researcher traveled to Sudan to recover pieces of an asteroid that slammed into Earth's atmosphere only 19 hours after being spotted. It was a long shot that paid off beyond his wildest dreams.
> More at: http://www.skyandtelescope.com/community/skyblog/newsblog/41873107.html
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Here are two paragraphs from the link above. You may want to look at the whole article.
- LRK -

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Catch a Falling Star:
The Remarkable Asteroid 2008 TC3
NEWS BLOG by Kelly Beatty

This week I'm in Houston for the 40th annual Lunar & Planetary Science Conference, where 1,500 researchers have gathered to talk shop about the solar system. And indeed the big space news this week involves high-stakes interplanetary events — but the story should be datelined "Almahata Sitta, Sudan" instead of "Houston, Texas."

Our saga begins a few months ago, when Planet Earth got an unprecedented visit from a small asteroid designated 2008 TC3. A telescopic observer atop Mount Lemmon, Arizona, discovered this incoming chunk of rock on October 6th, and it slammed into the atmosphere over northern Sudan just 19 hours later. Since the 1970s astronomers have tracked down thousands of asteroids that might someday strike Earth — this is the first discovery that actually did.
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NASA has posted many illustrations about these remarkable events here.
http://www.nasa.gov/topics/solarsystem/tc3/index.html

If you have access to the publication, "nature - International weekly journal of science" the findings are posted here.
- LRK -
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http://www.nature.com/nature/journal/v458/n7237/abs/nature07920.html
/Nature/ *458*, 485-488 (26 March 2009) | doi:10.1038/nature07920; Received 6 February 2009; Accepted 20 February 2009
The impact and recovery of asteroid 2008 TC_3

P. Jenniskens1, M. H. Shaddad2, D. Numan2, S. Elsir3, A. M. Kudoda2, M. E. Zolensky4, L. Le4,5, G. A. Robinson4,5, J. M. Friedrich6,7, D. Rumble8, A. Steele8, S. R. Chesley9, A. Fitzsimmons10, S. Duddy10, H. H. Hsieh10, G. Ramsay11, P. G. Brown12, W. N. Edwards12, E. Tagliaferri13, M. B. Boslough14, R. E. Spalding14, R. Dantowitz15, M. Kozubal15, P. Pravec16, J. Borovicka16, Z. Charvat17, J. Vaubaillon18, J. Kuiper19, J. Albers1, J. L. Bishop1, R. L. Mancinelli1, S. A. Sandford20, S. N. Milam20, M. Nuevo20 & S. P. Worden20

In the absence of a firm link between individual meteorites and their asteroidal parent bodies, asteroids are typically characterized only by their light reflection properties, and grouped accordingly into classes1, 2, 3. On 6 October 2008, a small asteroid was discovered with a flat reflectance spectrum in the 554–995 nm wavelength range, and designated 2008 TC3 (refs 4–6). It subsequently hit the Earth. Because it exploded at 37 km altitude, no macroscopic fragments were expected to survive. Here we report that a dedicated search along the approach trajectory recovered 47 meteorites, fragments of a single body named Almahata Sitta, with a total mass of 3.95 kg. Analysis of one of these meteorites shows it to be an achondrite, a polymict ureilite, anomalous in its class: ultra-fine-grained and porous, with large carbonaceous grains. The combined asteroid and meteorite reflectance spectra identify the asteroid as F class3, now firmly linked to dark carbon-rich anomalous ureilites, a material so fragile it was not previously represented in meteorite collections.
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I seem to have missed the event last year so some links posted below.
- LRK -

Then again, I would have missed the one that is flying by today.
- LRK -

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http://www.spaceweather.com/
March 27, 2009

*ASTEROID FLYBY:* Asteroid 2009 FD is flying past Earth today less than 620,000 km (1.6 LD) away. There is no danger of a collision with the 160m-wide space rock, but it is close enough to photograph using backyard telescopes. Sunlight reflected from the surface of the asteroid makes it shine like a 13th magnitude star. Use this ephemeris to find it
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Thanks for looking up with me.

Larry Kellogg

Web Site: http://lkellogg.vttoth.com/LarryRussellKellogg/
BlogSpot: http://kelloggserialreports.blogspot.com/
RSS link: http://kelloggserialreports.blogspot.com/atom.xml
Newsletter: https://news.altair.com/mailman/listinfo/lunar-update
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http://orbit.psi.edu/?q=node/22
Asteroid 2008 TC3 Reaching Earth
Submitted by tricaric on Mon, 10/06/2008 - 22:58.

We have prepared a short animation, showing the Earth as viewed by the asteroid 2008 TC3. The asteroid is reaching Earth from the night side, and enters the Earth's shadow cone around 1:50 UTC.
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http://www.astronomy.com/asy/default.aspx?c=a&id=7468
Video of October 6 asteroid 2008 TC3

A small asteroid discovered earlier October 6 entered Earth's atmosphere later that night. Friction with the air caused the object to explode with roughly a kiloton of energy, creating a spectacular fireball as it disintegrated. The object, designated 2008 TC3, was only 3 to 15 feet (1 to 5 meters) across and posed no threat to reach Earth's surface or the altitude of airplanes.

On October 7, the husband and wife observing team of Imelda Joson and Edwin Aguirre forwarded to Astronomy an image and an animation of the asteroid 2008 TC3 they received from amateur astronomer friends in Italy. Imelda runs an image service company and is a contributor to Astronomy magazine.
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http://neo.jpl.nasa.gov/news/news160.html
Impact of Asteroid 2008 TC3 Confirmed Don Yeomans
NASA/JPL Near-Earth Object Program Office
October 7, 2008

Confirmation has been received that the asteroid impact fireball occurred at the predicted time and place. The energy recorded was estimated to be 0.9 to 1.0 kT of TNT and the time of detection was 02:45:45 on October 7 (Greenwich Standard Time). More details on this detection will be forthcoming. An additional confirmation was apparently reported by a KLM airliner (see: http://www.spaceweather.com/). As reported by Peter Brown (University of Western Ontario, Canada), a preliminary examination of infrasound stations nearest to the predicted impact point shows that at least one station recorded the event. These measurements are consistent with the predicted time and place of the atmospheric impact and indicate an estimated energy of 1.1 - 2.1 kT of TNT.

The follow-up astrometric observations from professional and sophisticated amateur astronomers alike were rather extraordinary, with 570 observations from 26 observatories being reported between the time of discovery by the Catalina Sky Survey to just before the object entered Earth's shadow (57 minutes prior to impact). All this happened in less than 19 hours!
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http://www.planetary.org/blog/article/00001684/
The full story of Earth-impacting asteroid 2008 TC3
Oct. 7, 2008 | 16:15 PDT | 23:15 UTC

Over the last 24 hours it has been tiring but really fun to watch the drama of asteroid 2008 TC3. It has happened so quickly that it's necessary to convert all times to UTC in order to see how events have unfolded across the globe. Fortunately for my sanity, nearly all of the events are neatly collected on the Minor Planets Mailing List.

To briefly review: the night before last (my time), or at 06:38 UTC on October 6, astronomers at the University of Arizona discovered an object provisionally called 8TA9D69 that appeared to be on a collision course with Earth. Three other observatories reported sightings within the next few hours -- Sabino Canyon and Siding Spring in Arizona and a Royal Astronomical Society site in Moorook, Australia. Together these four observers provided enough data on the object so that a Minor Planet Electronic Circular was issued at 14:59 UTC the same day, giving 8TA9D69 the more formal name 2008 TC3, and advising the astronomical community that "The nominal orbit given above has 2008 TC3 coming to within one earth radius around Oct. 7.1. The absolute magnitude indicates that the object will not survive passage through the atmosphere. Steve Chesley (JPL) reports that atmospheric entry will occur on 2008 Oct 07 0246 UTC over northern Sudan."
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WHAT THE MIND CAN CONCEIVE, AND BELIEVE, IT WILL ACHIEVE - LRK

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