M-type (22) Kalliope: A tiny Mercury

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10453451" target="_blank" >RIV/00216208:11320/22:10453451 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=49YlVpfk8J" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=49YlVpfk8J</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202243200" target="_blank" >10.1051/0004-6361/202243200</a>

Jazyk výsledku

angličtina

Název v původním jazyce

M-type (22) Kalliope: A tiny Mercury

Popis výsledku v původním jazyce

Context. Asteroid (22) Kalliope is the second largest M-type asteroid in the main belt and is orbited by a satellite, Linus. Whereas the mass of Kalliope is already well constrained thanks to the presence of a moon, its volume is still poorly known, leading to uncertainties on its bulk density and internal structure. Aims. We aim to refine the shape of (22) Kalliope and thus its diameter and bulk density, as well as the orbit of its moon to better constrain its mass, hence density and internal structure. Methods. We acquired disk-resolved observations of (22) Kalliope using the VLT/SPHERE/ZIMPOL instrument to reconstruct its three-dimensional (3D) shape using three different modeling techniques. These images were also used together with new speckle observations at the C2PU/PISCO instrument as well as archival images from other large ground-based telescopes to refine the orbit of Linus. Results. The volume of (22) Kalliope given by the shape models, corresponding to D= 150 +/- 5 km, and the mass constrained by its satellite&apos;s orbit yield a density of rho = 4.40 +/- 0.46 g cm(-3). This high density potentially makes (22) Kalliope the densest known small body in the Solar System. A macroporosity in the 10-25% range (as expected for this mass and size), implies a grain density in the 4.8-5.9 g cm(-3) range. Kalliope&apos;s high bulk density, along with its silicate-rich surface implied by its low radar albedo, implies a differentiated interior with metal contributing to most of the mass of the body. Conclusions. Kalliope&apos;s high metal content (40-60%) along with its metal-poor mantle makes it the smallest known Mercury-like body. A large impact at the origin of the formation of the moon Linus is likely the cause of its high metal content and density.

Název v anglickém jazyce

M-type (22) Kalliope: A tiny Mercury

Popis výsledku anglicky

Context. Asteroid (22) Kalliope is the second largest M-type asteroid in the main belt and is orbited by a satellite, Linus. Whereas the mass of Kalliope is already well constrained thanks to the presence of a moon, its volume is still poorly known, leading to uncertainties on its bulk density and internal structure. Aims. We aim to refine the shape of (22) Kalliope and thus its diameter and bulk density, as well as the orbit of its moon to better constrain its mass, hence density and internal structure. Methods. We acquired disk-resolved observations of (22) Kalliope using the VLT/SPHERE/ZIMPOL instrument to reconstruct its three-dimensional (3D) shape using three different modeling techniques. These images were also used together with new speckle observations at the C2PU/PISCO instrument as well as archival images from other large ground-based telescopes to refine the orbit of Linus. Results. The volume of (22) Kalliope given by the shape models, corresponding to D= 150 +/- 5 km, and the mass constrained by its satellite&apos;s orbit yield a density of rho = 4.40 +/- 0.46 g cm(-3). This high density potentially makes (22) Kalliope the densest known small body in the Solar System. A macroporosity in the 10-25% range (as expected for this mass and size), implies a grain density in the 4.8-5.9 g cm(-3) range. Kalliope&apos;s high bulk density, along with its silicate-rich surface implied by its low radar albedo, implies a differentiated interior with metal contributing to most of the mass of the body. Conclusions. Kalliope&apos;s high metal content (40-60%) along with its metal-poor mantle makes it the smallest known Mercury-like body. A large impact at the origin of the formation of the moon Linus is likely the cause of its high metal content and density.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

662

Číslo periodika v rámci svazku

červen

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

18

Strana od-do

A71

Kód UT WoS článku

000813280700004

EID výsledku v databázi Scopus

2-s2.0-85133188243