[meteorite-list] Meteorites from 2024 BX1

[John Lutzon]

    Mr. Kereszty, Matson,

     From a couch collector to the "eyes in the skies and boots on the grounds" --- I am amazed at your skillful efforts and big thanks to all of you do'ers!
   Kudos all way 'round. Bravo
John

> On 02/01/2024 1:31 PM EST Matson, Rob D. [US-US] via Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
> 
>  
> Congratulations on your finds, Zsolt! A little back-story from my end. I followed 2024 BX1 from the moment of its discovery (having been fortunate enough to be at my computer when I got the first JPL/SCOUT alerts).  After the first 7 observations, the minor planet community knew it was going to be an impactor in northern Germany in less than a couple hours (21 Jan 2024 00:32:45 UT). As the # of telescopic observations grew from 7 to 20 to 50 to over 100, I kept adjusting the impact trajectory, ultimately constraining the terminal path to about 100-meter uncertainty. Meanwhile, I grabbed the radiosonde upper atmospheric wind data launched from Lindenberg (only 110 km away from the future fall location) and ran dark flight predictions. This is the first fall where I was able to generate a map of predicted mass locations ... BEFORE the meteoroid even hit the atmosphere! 😊  I passed this map and kmz file on to Peter Jenniskens who was flying out the next day. (Also a few others who had expressed interest in searching for fragments of this Apollo asteroid.)
> 
> As Zsolt knows, this was no run-of-the-mill fall. In a fresh fall (such as the one that occurred north of Quartzsite, AZ at the end of December), the stones are almost always covered in black fusion crust -- usually a matte black for chondrites, or a shiny, glassy black for many types of achondrites. Not so for this new fall north of Brandenberg! If I had been over their searching, I could easily have walked right past these newly arrived rocks from space that to the casual eye look like terrestrial stones. Hats off to (I believe) the Polish team that made the first 3 or 4 finds, recognizing them for what they were!
> 
> 2024 BX1 was not a large meteoroid: between 0.8 and 1.4 meters in size, depending on its albedo. The orbit is (or rather was) well established, with an aphelion that pretty much ruled out a (low albedo) carbonaceous chondrite. So the size was most likely around a meter or slightly less. The entry velocity was relatively slow (15.2 km/sec), but the entry angle was quite steep (only 15 degrees from vertical). The former favored meteorites on the ground, while the latter still meant the total recovered mass would be low.
> 
> Anyway, kudos again on your rare finds, Zsolt! And a big shout out to Hungarian astronomer Krisztian Sarneczky for finding and rapidly reporting 2024 BX1! This was not Krisztian's first rodeo -- he has the unique distinction of having discovered not just one Earth impactor, but now THREE! (Less than a year ago he discovered 2023 CX1 -- the asteroid that entered over Normandy and was also successfully found by meteorite hunters.) Clearly he is doing something right with his setup and operational plan!
> 
> Cheers,
> Rob
> 
> -----Original Message-----
> From: Meteorite-list <meteorite-list-bounces at meteoritecentral.com> On Behalf Of Zsolt Kereszty via Meteorite-list
> Sent: Thursday, February 1, 2024 6:08 AM
> To: meteorite-list at meteoritecentral.com
> Subject: EXTERNAL: [meteorite-list] For sale 9.6 gr complete piece of new 2024 BX1 prediction fall asteroid - very nee found Germany
> 
> CAUTION: This email originated from outside of Leidos. Be cautious when clicking or opening content.
> 
> Dear List Members!
> 
> Just I now finished my expedition in Germany, cmosed to Berlin at Ribbeck. It took for 6 days and 100 km long.
> So I have ONLY one piece what I can sell, I keep my other piece. I have found it today.
> 
> I have in-situ photos, GPS coordinates, found time, soil sample from under the piece, plants, today local newspaper, german choclste :-) Thats a fully documented piece.
> 
> If I have measured it well in the field its 9.6 gr with cracked crazy translucent fusion crust. I didnt see ever such unique crust! Its an aubrite !
> 
> So the price with the additional things is 18000€
> 
> If I know well there is largest for sale piece of 2024BX1 recently.
> 
> If you interest contact me and I send you the images.
> 
> Best Regards!
> 
> Zsolt Kereszty
> IMCA, GMA, MetSoc
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