Interpreting the Cratering Histories of Bennu, Ryugu, and Other Spacecraft-explored Asteroids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10422457" target="_blank" >RIV/00216208:11320/20:10422457 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=U28CkJ9JT8" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=U28CkJ9JT8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-3881/ab88d3" target="_blank" >10.3847/1538-3881/ab88d3</a>

Result language

angličtina

Original language name

Interpreting the Cratering Histories of Bennu, Ryugu, and Other Spacecraft-explored Asteroids

Original language description

Asteroid crater retention ages have unknown accuracy because projectile-crater scaling laws are difficult to verify. At the same time, our knowledge of asteroid and crater size-frequency distributions has increased substantially over the past few decades. These advances make it possible to empirically derive asteroid crater scaling laws by fitting model asteroid size distributions to crater size distributions from asteroids observed by spacecraft. ForD &gt; 10 km diameter asteroids like Ceres, Vesta, Lutetia, Mathilde, Ida, Eros, and Gaspra, the best matches occur when the ratio of crater to projectile sizes isf similar to 10. The same scaling law applied to 0.3 D &lt; 2.5 km near-Earth asteroids such as Bennu, Ryugu, Itokawa, and Toutatis yield intriguing yet perplexing results. When applied to the largest craters on these asteroids, we obtain crater retention ages of similar to 1 billion years for Bennu, Ryugu, and Itokawa and similar to 2.5 billion years for Toutatis. These ages agree with the estimated formation ages of their source families and could suggest that the near-Earth asteroid population is dominated by bodies that avoided disruption during their traverse across the main asteroid belt. An alternative interpretation is thatf &gt;&gt; 10, which would make their crater retention ages much younger. If true, crater scaling laws need to change in a substantial way betweenD &gt; 10 km asteroids, wheref similar to 10, and 0.3 D &lt; 2.5 km asteroids, wheref &gt;&gt; 10.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA18-06083S" target="_blank" >GA18-06083S: Evolution of solid bodies in protoplanetary disks and during collisions</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

The Astronomical Journal

ISSN

0004-6256

e-ISSN

—

Volume of the periodical

160

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

37

Pages from-to

14

UT code for WoS article

000541912500001

EID of the result in the Scopus database

2-s2.0-85087369801