marketrent OP t1_it82c9m wrote on October 21, 2022 at 4:41 PM

Reply to comment by shiruken in As many as a fifth of all asteroids in the asteroid belt may have been formed out on the fringes of the solar system. Findings suggest that both Ryugu and the CI chondrites originate from the same region of space, and could even have shared the same parent body. by marketrent

Thanks! (The press release didn’t include hyperlinks.)

>Abstract

>Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable from Ivuna-type (CI) chondrites, which are distinct from all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate that Ryugu and CI chondrites formed in a reservoir that was different from the source regions of other carbonaceous asteroids. Growth and migration of the giant planets destabilized nearby planetesimals and ejected some inwards to be implanted into the Main Belt.

>In this framework, most carbonaceous chondrites may have originated from regions around the birthplaces of Jupiter and Saturn, while the distinct isotopic composition of CI chondrites and Ryugu may reflect their formation further away in the disk, owing their presence in the inner Solar System to excitation by Uranus and Neptune.