Asteroid 21 Lutetia: Low Mass, High Density

Details Asteroid 21 Lutetia: Low Mass, High Density Asteroid 21 Lutetia: Low Mass, High Density

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sci...334..491p&link_type=abstract

Science, Volume 334, Issue 6055, pp. 491- (2011).

Computer Science

3

Scientific paper

Asteroid 21 Lutetia was approached by the Rosetta spacecraft on 10 July 2010. The additional Doppler shift of the spacecraft radio signals imposed by 21 Lutetia’s gravitational perturbation on the flyby trajectory were used to determine the mass of the asteroid. Calibrating and correcting for all Doppler contributions not associated with Lutetia, a least-squares fit to the residual frequency observations from 4 hours before to 6 hours after closest approach yields a mass of (1.700 ± 0.017) × 1018 kilograms. Using the volume model of Lutetia determined by the Rosetta Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) camera, the bulk density, an important parameter for clues to its composition and interior, is (3.4 ± 0.3) × 103 kilograms per cubic meter.

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