The violent collisional history of aqueously evolved (2) Pallas
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423524" target="_blank" >RIV/00216208:11320/20:10423524 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=F1YNtQRFYD" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=F1YNtQRFYD</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41550-019-1007-5" target="_blank" >10.1038/s41550-019-1007-5</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The violent collisional history of aqueously evolved (2) Pallas
Popis výsledku v původním jazyce
High-resolution observations of the third largest asteroid, (2) Pallas, from SPHERE unveil a heavily cratered surface, probably due to Pallas's inclined and eccentric orbit, a density almost equal to carbonaceous chondrites and hint at surficial salt-enriched spots. Asteroid (2) Pallas is the largest main-belt object not yet visited by a spacecraft, making its surface geology largely unknown and limiting our understanding of its origin and collisional evolution. Previous ground-based observational campaigns returned different estimates of its bulk density that are inconsistent with one another, one measurement(1) being compatible within error bars with the icy Ceres (2.16 +/- 0.01 g cm(-3))(2) and the other(3) compatible within error bars with the rocky Vesta (3.46 +/- 0.03 g cm(-3))(4). Here we report high-angular-resolution observations of Pallas performed with the extreme adaptive optics-fed SPHERE imager(5) on the Very Large Telescope. Pallas records a violent collisional history, with numerous craters larger than 30 km in diameter populating its surface and two large impact basins that could be related to a family-forming impact. Monte Carlo simulations of the collisional evolution of the main belt correlate this cratering record to the high average impact velocity of similar to 11.5 km s(-1) on Pallas-compared with an average of similar to 5.8 km s(-1) for the asteroid belt-induced by Pallas's high orbital inclination (i = 34.8 degrees) and orbital eccentricity (e = 0.23). Compositionally, Pallas's derived bulk density of 2.89 +/- 0.08 g cm(-3) (1 sigma uncertainty) is fully compatible with a CM chondrite-like body, as suggested by its spectral reflectance in the 3 mu m wavelength region(6). A bright spot observed on its surface may indicate an enrichment in salts during an early phase of aqueous alteration, compatible with Pallas's relatively high albedo of 12-17% (refs. (7,8)), although alternative origins are conceivable.
Název v anglickém jazyce
The violent collisional history of aqueously evolved (2) Pallas
Popis výsledku anglicky
High-resolution observations of the third largest asteroid, (2) Pallas, from SPHERE unveil a heavily cratered surface, probably due to Pallas's inclined and eccentric orbit, a density almost equal to carbonaceous chondrites and hint at surficial salt-enriched spots. Asteroid (2) Pallas is the largest main-belt object not yet visited by a spacecraft, making its surface geology largely unknown and limiting our understanding of its origin and collisional evolution. Previous ground-based observational campaigns returned different estimates of its bulk density that are inconsistent with one another, one measurement(1) being compatible within error bars with the icy Ceres (2.16 +/- 0.01 g cm(-3))(2) and the other(3) compatible within error bars with the rocky Vesta (3.46 +/- 0.03 g cm(-3))(4). Here we report high-angular-resolution observations of Pallas performed with the extreme adaptive optics-fed SPHERE imager(5) on the Very Large Telescope. Pallas records a violent collisional history, with numerous craters larger than 30 km in diameter populating its surface and two large impact basins that could be related to a family-forming impact. Monte Carlo simulations of the collisional evolution of the main belt correlate this cratering record to the high average impact velocity of similar to 11.5 km s(-1) on Pallas-compared with an average of similar to 5.8 km s(-1) for the asteroid belt-induced by Pallas's high orbital inclination (i = 34.8 degrees) and orbital eccentricity (e = 0.23). Compositionally, Pallas's derived bulk density of 2.89 +/- 0.08 g cm(-3) (1 sigma uncertainty) is fully compatible with a CM chondrite-like body, as suggested by its spectral reflectance in the 3 mu m wavelength region(6). A bright spot observed on its surface may indicate an enrichment in salts during an early phase of aqueous alteration, compatible with Pallas's relatively high albedo of 12-17% (refs. (7,8)), although alternative origins are conceivable.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10308 - Astronomy (including astrophysics,space science)
Návaznosti výsledku
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)
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Nature Astronomy [online]
ISSN
2397-3366
e-ISSN
—
Svazek periodika
4
Číslo periodika v rámci svazku
6
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
8
Strana od-do
569-576
Kód UT WoS článku
000512527500002
EID výsledku v databázi Scopus
—