The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00482629" target="_blank" >RIV/67985815:_____/17:00482629 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1038/nature24051" target="_blank" >http://dx.doi.org/10.1038/nature24051</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/nature24051" target="_blank" >10.1038/nature24051</a>

Result language

angličtina

Original language name

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation

Original language description

Here we report observations from multiple Earth-based observatories of Haumea passing in front of a distant star (a multi chord stellar occultation). Secondary events observed around the main body of Haumea are consistent with the presence of a ring with an opacity of 0.5, width of 70 kilometres and radius of about 2,287 kilometres. The ring is coplanar with both Haumea's equator and the orbit of its satellite Hi'iaka. The radius of the ring places it close to the 3:1 mean-motion resonance with Haumea's spin period-that is, Haumea rotates three times on its axis in the time that a ring particle completes one revolution. The occultation by the main body provides an instantaneous elliptical projected shape with axes of about 1,704 kilometres and 1,138 kilometres. Combined with rotational light curves, the occultation constrains the three-dimensional orientation of Haumea and its triaxial shape, which is inconsistent with a homogeneous body in hydrostatic equilibrium. Haumea's largest axis is at least 2,322 kilometres, larger than previously thought, implying an upper limit for its density of 1,885 kilograms per cubic metre and a geometric albedo of 0.51, both smaller than previous estimates(1,10,11). In addition, this estimate of the density of Haumea is closer to that of Pluto than are previous estimates, in line with expectations. No global nitrogen- or methane-dominated atmosphere was detected.

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

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

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

Name of the periodical

Nature

ISSN

0028-0836

e-ISSN

—

Volume of the periodical

550

Issue of the periodical within the volume

7675

Country of publishing house

GB - UNITED KINGDOM

Number of pages

5

Pages from-to

219-223

UT code for WoS article

000412829500041

EID of the result in the Scopus database

2-s2.0-85031302939