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2021 Fall Date Project

The MPOD Caretakers want to present meteorite falls on their fall dates. For example, Sikhote Aline on 12 February.

This Project will not dip into the MPOD archives so the Caretakers will appreciate anything you can contribute.

To reserve a date just let us know. Thank you in advance :)

Fall Calendar           Dates reserved so far

 

 
Almahata Sitta   contributed by Anne Black, IMCA 2356   MetBul Link


Roll Overs:     #1   #2   #3   #4    


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Find/Fall Anniversary
9.61 grams.   Urelite-an

TKW 3.95 kg.

Pre-Earth-encounter size estimated to be 4.1 meters in diameter and 80,000 kilograms.
Observed approach: 6 October 2008

Observed fall: 7 October 2008

First found: 6 December 2008, Nahr an Nil, Nubian Desert, Sudan.

Many stones from this fall have been classified, with a wide variety of results - Ureilite, polymict, anomalous; bencubbin; EH 4/5; and EL 3.

From the MetBul:
On October 6, 2008, a small asteroid called 2008 TC3 was discovered by the automated Catalina Sky Survey 1.5 m telescope at Mount Lemmon, Tucson, Arizona, and found to be on a collision course with Earth. Numerous astronomical observatories followed the object until it entered the Earth’s umbra at Oct. 7.076 UTC the next day. The astrometric position of 295 observations of 2008 TC3 over the period Oct. 6.278 to Oct. 7.063 was used to calculate the approach trajectory over the impact location in northern Sudan. The object exploded at a high ~37 km altitude over the Nubian Desert, and as a result the meteorites are spread over a large area. A search was organized by the University of Khartoum on Dec. 2–9, led by P. Jenniskens (SETI Institute) and M. H. Shaddad (Khartoum).


       


Anne writes:
Discovered by a telescope near Tucson Arizona as it was still an asteroid on October 6, 2008. Fell in Northern Sudan as predicted on October 7. Found as thousand of fragments, by an expedition led by the University of Khartoum. Each and every one of those fragments is now being studied and analyzed by Professor Andi Bischoff who has already found many different types of meteorites from that one single fall.

Rarest classification, so far, is trachyandesite. Only 2 small fragments known and this is one: MS-277, 9.61g.

Pics show outside, crust, and inside fine crystallization.


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Photo 1

Photo 2

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Photo 4

Found at the arrow (green or red) on the map below

 


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This Month

Twink Monrad
 10/7/2021 6:30:04 PM
I recall seeing a really good special on tv about this and the hunt and find, think maybe Nation Geographic channel??
Anne Black
 10/7/2021 12:20:41 PM
Thank you! You are all very welcome. Thank you Richard for discovering it. And it was 13 years ago, Almahata Sitta is a teenager now.
Greg Lindh
 10/7/2021 12:07:13 PM
Very interesting report, Anne. Unusual that we were able to see it while it was still an asteroid, and that it yielded various classifications. Thanks for posting this, Anne.
matthias
 10/7/2021 3:41:27 AM
A white-cruster: not bad, Madame Black! : - )
Paul Kurimsky
 10/7/2021 3:11:04 AM
I thought that the tracking with Richard running the CSS was an awesome job, and to be able to track it with such precision!
Andreas Ruh
 10/7/2021 1:59:21 AM
Very nice specimen. Congratulations, Anne!
 

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