2024 BX1, previously known under its temporary designation Sar2736, was a 44 centimetre-sized (17 inches)[4] asteroid or meteoroid that entered Earth's atmosphere on 21 January 2024 00:33 UTC and disintegrated as a meteor over Berlin.

It was discovered less than three hours before impact by Hungarian astronomer Krisztián Sárneczky at Konkoly Observatory's Piszkéstető Station in the Mátra Mountains, Hungary.

Sárneczky first thought it was a known asteroid because it had a brightness of 18th magnitude, but he could not find it in any catalog, so he reported it to the Minor Planet Center.

The size and mass were first estimated at 1 meter and 1700 kg based on albedos of S-type asteroids.

[11][12][5] Searches were conducted by the German Aerospace Center (DLR), the Berlin universities, members of the Meteor Working Group and meteorite hunters.

[5] First analysis by scientists of the Natural History Museum in Berlin showed that it was an aubrite, a rare group of meteorites.

It was also shown that it had similar 0.5/0.9 μm band depths when compared to 434 Hungaria, hinting at a possible linkage.

Seven pieces of the meteorite were exhibited at the Natural History Museum in Berlin for a few weeks in March 2024.

A 5.3 g piece found by Szymon Kozłowski is on display at the Astronomical Observatory of the University of Warsaw.