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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Rosetta mission of the European Space Agency has been orbiting the comet67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escortphase. A large complement of scientific experiments designed to complete themost detailed study of a comet ever attempted are onboard Rosetta. We presentresults for the photometric and spectrophotometric properties of the nucleus of67P derived from the OSIRIS imaging system, which consists of a Wide AngleCamera (WAC) and a Narrow Angle Camera (NAC). The disk-averaged phase functionof the nucleus of 67P shows a strong opposition surge with a G parameter valueof -0.13$\pm$0.01 in the HG system formalism and an absolute magnitude$H_v(1,1,0)$ = 15.74$\pm$0.02 mag. The integrated spectrophotometry in 20filters covering the 250-1000 nm wavelength range shows a red spectralbehavior, without clear absorption bands except for a potential absorptioncentered at $\sim$ 290 nm that is possibly due to SO$_2$ ice. The nucleus showsstrong phase reddening, with disk-averaged spectral slopes increasing from11\%/(100 nm) to 16\%/(100 nm) in the 1.3$^{\circ}$--54$^{\circ}$ phase anglerange. The geometric albedo of the comet is 6.5$\pm$0.2\% at 649 nm, with localvariations of up to $\sim$ 16\% in the Hapi region. From the disk-resolvedimages we computed the spectral slope together with local spectrophotometry andidentified three distinct groups of regions (blue, moderately red, and red).The Hapi region is the brightest, the bluest in term of spectral slope, and themost active surface on the comet. Local spectrophotometry shows an enhancementof the flux in the 700-750 nm that is associated with coma emissions.

Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft