English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Pro

Presents the zaia usage as premium feature

ZAIA

Presents AI Discovery search usage as a premium feature

AI Discovery

Presents AI Discovery explain and summary usage as a premium feature

Content Analysis

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Presents the pdf analysis as premium feature

PDF Analysis

1500 Top-up

3000 Top-up

Zendy Basic

2500 Top-up

Zendy Unlimited

Presents the access of premium content as premium feature

Premium Content

We use thermal radiometry and visible photometry to constrain the size,shape, and albedo of the large Kuiper belt object Haumea. The correlationbetween the visible and thermal photometry demonstrates that Haumea's highamplitude and quickly varying optical light curve is indeed due to Haumea'sextreme shape, rather than large scale albedo variations. However, thewell-sampled high precision visible data we present does require longitudinalsurface heterogeneity to account for the shape of lightcurve. The thermalemission from Haumea is consistent with the expected Jacobi ellipsoid shape ofa rapidly rotating body in hydrostatic equilibrium. The best Jacobi ellipsoidfit to the visible photometry implies a triaxial ellipsoid with axes of length1920 x 1540 x 990 km and density 2.6 g cm^-3$, as found by Lellouch etal(2010). While the thermal and visible data cannot uniquely constrain the fullnon-spherical shape of Haumea, the match between the predicted and measuredthermal flux for a dense Jacobi ellipsoid suggests that Haumea is indeed one ofthe densest objects in the Kuiper belt.

The size and shape of the oblong dwarf planet Haumea