In:
The Planetary Science Journal, American Astronomical Society, Vol. 4, No. 8 ( 2023-08-01), p. 144-
Abstract:
We present oxygen isotopic analyses of fragments of the near-Earth C b -type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in Δ ′ 17 O can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope 26 Al, suggests that if lithified at the time of alteration, the parent body was small (≪50 km radius). If the parent planetesimal was large ( 〉 50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock.
Type of Medium:
Online Resource
ISSN:
2632-3338
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2023
detail.hit.zdb_id:
3021068-9