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/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report on the thermal properties and composition of asteroid (2867) Steinsderived from an analysis of new Spitzer Space Telescope (SST) observationsperformed in March 2008, in addition to previously published SST observationsperformed in November 2005. We consider the three-dimensional shape model andphotometric properties derived from OSIRIS images obtained during the flyby ofthe Rosetta spacecraft in September 2008, which we combine with a thermal modelto properly interpret the observed SST thermal light curve and spectral energydistributions. We obtain a thermal inertia in the range 100\pm50 JK-1m-2s-1/2and a beaming factor (roughness) in the range 0.7-1.0. We confirm that theinfrared emissivity of Steins is consistent with an enstatite composition. TheNovember 2005 SST thermal light curve is most reliably interpreted by assuminginhomogeneities in the thermal properties of the surface, with two differentregions of slightly different roughness, as observed on other small bodies,such as the nucleus of comet 9P/Tempel 1. Our results emphasize that the shapemodel is important to an accurate determination of the thermal inertia androughness. Finally, we present temperature maps of Steins, as seen by Rosettaduring its flyby, and discuss the interpretation of the observations performedby the VIRTIS and MIRO instruments.

The properties of asteroid (2867) Steins from Spitzer observations and OSIRIS shape reconstruction