A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421655" target="_blank" >RIV/00216208:11320/20:10421655 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=pBqWuh5~i8" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=pBqWuh5~i8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41550-019-0915-8" target="_blank" >10.1038/s41550-019-0915-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea

Popis výsledku v původním jazyce

(10) Hygiea is the fourth largest main belt asteroid and the only known asteroid whose surface composition appears similar to that of the dwarf planet (1) Ceres(1,2), suggesting a similar origin for these two objects. Hygiea suffered a giant impact more than 2 Gyr ago(3) that is at the origin of one of the largest asteroid families. However, Hygeia has never been observed with sufficiently high resolution to resolve the details of its surface or to constrain its size and shape. Here, we report high-angular-resolution imaging observations of Hygiea with the VLT/SPHERE instrument (20 mas at 600 nm) that reveal a basin-free nearly spherical shape with a volume-equivalent radius of 217 +/- 7 km, implying a density of 1,944 +/- 250 kg m(-3) to 1 sigma. In addition, we have determined a new rotation period for Hygiea of 13.8 h, which is half the currently accepted value. Numerical simulations of the family-forming event show that Hygiea&apos;s spherical shape and family can be explained by a collision with a large projectile (diameter 75-150 km). By comparing Hygiea&apos;s sphericity with that of other Solar System objects, it appears that Hygiea is nearly as spherical as Ceres, opening up the possibility for this object to be reclassified as a dwarf planet.

Název v anglickém jazyce

A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea

Popis výsledku anglicky

(10) Hygiea is the fourth largest main belt asteroid and the only known asteroid whose surface composition appears similar to that of the dwarf planet (1) Ceres(1,2), suggesting a similar origin for these two objects. Hygiea suffered a giant impact more than 2 Gyr ago(3) that is at the origin of one of the largest asteroid families. However, Hygeia has never been observed with sufficiently high resolution to resolve the details of its surface or to constrain its size and shape. Here, we report high-angular-resolution imaging observations of Hygiea with the VLT/SPHERE instrument (20 mas at 600 nm) that reveal a basin-free nearly spherical shape with a volume-equivalent radius of 217 +/- 7 km, implying a density of 1,944 +/- 250 kg m(-3) to 1 sigma. In addition, we have determined a new rotation period for Hygiea of 13.8 h, which is half the currently accepted value. Numerical simulations of the family-forming event show that Hygiea&apos;s spherical shape and family can be explained by a collision with a large projectile (diameter 75-150 km). By comparing Hygiea&apos;s sphericity with that of other Solar System objects, it appears that Hygiea is nearly as spherical as Ceres, opening up the possibility for this object to be reclassified as a dwarf planet.

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

2020

Kód důvěrnosti údajů

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

Název periodika

Nature Astronomy

ISSN

2397-3366

e-ISSN

—

Svazek periodika

4

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

136-141

Kód UT WoS článku

000512983200014

EID výsledku v databázi Scopus

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