Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p14b..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P14B-02
Mathematics
Logic
[6017] Planetary Sciences: Comets And Small Bodies / Erosion And Weathering, [6022] Planetary Sciences: Comets And Small Bodies / Impact Phenomena, [6055] Planetary Sciences: Comets And Small Bodies / Surfaces, [6205] Planetary Sciences: Solar System Objects / Asteroids
Scientific paper
The Optical, Spectroscopic, and Infrared Remote Imaging System OSIRIS observed the asteroid (21) Lutetia during the fly-by of ESA’s Rosetta spacecraft on 10. July 2010. Observations with the narrow angle (NAC) and wide angle (WAC) cameras covered a large phase angle range (from 10 deg during approach through near zero reaching almost 150 deg after closest approach (CA)). The large field of view (2048 x 2048 pixels) of the narrow angle camera (NAC) was almost filled by the 100 km sized body at CA from a distance of 3160 km providing a scale of 60 m per pixel. The rugged body of (21) Lutetia appears to be shaped by an extensive collision history resulting in crater diameters comparable to the mean radius of the asteroid. Most of the visible northern hemisphere is scarred by numerous craters and therefore geologically old. However, several recent large impacts have covered their surroundings with thick layers of regolith. In addition to a wide variety of crater shapes a large diversity of geological features can be discerned: ridges, grabens, pits, landslides, talus, and boulders (> 150 m) and boulder tracks. Grooves are pervasive, radially aligned or concentric around recent craters, often cutting older craters indicating strong seismic activity caused by frequent impacts. In contrast to the observations of asteroid (2867) Steins weak variations of the surface albedo and colour variegations can be discerned and correlated with surface features. The observed opposition effect will constrain the properties of the regolith such as its grain size. The spectrum of Lutetia over the wavelength range of 250 to 1000 nm covered by the filters of the WAC and NAC is flat and hence Lutetia does not appear as red as Steins. Detailed photometric modeling taking advantage of the wide range of phase angles and spectral coverage will be combined and iterated with digital terrain models to describe the surface topography down to the resolution limit of the images and the overall shape to Lutetia.
Barbieri Carlo
Keller Hugo
Koschny Detlef
Lamy Philippe L.
OSIRIS Team
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