Details

Autor(en) / Beteiligte

• Pätzold, M.
• Andert, T. P.
• Asmar, S. W.
• Anderson, J. D.
• Barriot, J.-P.
• Bird, M. K.
• Häusler, B.
• Hahn, M.
• Tellmann, S.
• Sierks, H.
• Lamy, P.
• Weiss, B. P.

Titel

Asteroid 21 Lutetia: Low Mass, High Density

Ist Teil von

• Science (American Association for the Advancement of Science), 2011-10, Vol.334 (6055), p.491-492

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2011

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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) × 10¹ɸ kilograms. Using the volume model of Lutetia determined by the Rosetta Optical, Spectroscopie, 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.