Dronino consists of iron-meteorite fragments first found in the Ryazan district of Russia in 2000. The region has been inhabited for about a millennium and there are no reports of a large meteorite impact, indicating the mass must have fallen more than a thousand years ago. The old inferred terrestrial age is consistent with the high degree of weathering evident in typical specimens. Although 89% of iron meteorites are members of distinct chemical groups and hail from about a dozen different asteroids, the other 11% of recovered iron meteorites are chemically unrelated to other specimens and come from separate, otherwise unsampled, asteroids. They are known as “ungrouped” irons. Dronino is one of these unusual, ungrouped irons.
Click here to learn more about the science and history of meteorites.