Magrin S.,University of Padua |
La Forgia F.,University of Padua |
Pajola M.,Centro Interdipartimentale Of Studi E Attivita Spaziali G Colombo Cisas |
Lazzarin M.,University of Padua |
And 7 more authors.
Planetary and Space Science | Year: 2012
Here we present some preliminary results on surface variegation found on (21) Lutetia from ROSETTA-OSIRIS images acquired on 2010-07-10. The spectrophotometry obtained by means of the two cameras NAC and WAC (Narrow and Wide Angle Cameras) is consistent with ground based observations, and does not show surface diversity above the data error bars. The blue and UV images (shortward 500 nm) may, however, indicate a variegation of the optical properties of the asteroid surface on the Baetica region (Sierks et al., 2011). We also speculate on the contribution due to different illumination and to different ground properties (composition or, more probably, grain size diversity). In particular a correlation with geologic units independently defined by Massironi et al. (2012) is evident, suggesting that the variegation of the ground optical properties is likely to be real. © 2011 Elsevier Ltd.