2-5 ?m OBSERVATIONS OF EUROPA BY JUNO-JIRAM

Between August 2016 and February 2018 JIRAM, the Jovian InfraRed Auroral Mapper [1], onboard the Juno mission has acquired four serendipitous observations of Europa. Due to Juno's high eccentricity polar orbits around Jupiter, the fixed orientation of the spacecraft spin axis and orbital plane placed along terminator, Europa is observed by JIRAM at approximately 90° phase angle from distances greater than 1.68E5 km resulting in a best spatial resolution of 42 km/px. The available dataset consists of about one thousand infrared spectra which cover a limited range in longitude but an almost complete excursion in latitude from poles to equator. We report about the spectral analysis of those data performed by applying several spectral indicators [2] suitable to characterize Europa surface composition, regolith grain size distribution and temperature.