Images of Asteroid 21 Lutetia: A Remnant Planetesimal from the Early Solar System

@article{Sierks2011ImagesOA,
  title={Images of Asteroid 21 Lutetia: A Remnant Planetesimal from the Early Solar System},
  author={Holger Sierks and Philippe Lamy and Cesare Barbieri and Detlef Koschny and Hans Rickman and R. Rodrigo and Michael F. A’Hearn and Francesco Angrilli and Maria Antonietta Barucci and J L Bertaux and Ivano Bertini and S{\'e}bastien Besse and Beno{\^i}t Carry and Gabriele Cremonese and Vania Da Deppo and Bj{\"o}rn J R Davidsson and Stefano Debei and Mariolino De Cecco and Julia de Le{\'o}n and Fernando Ferri and Sonia Fornasier and Marco Fulle and S. F. Hviid and R. W. Gaskell and O. Groussin and Pedro J. Guti{\'e}rrez and Wing-H. Ip and Laurent Jorda and Mikko Kaasalainen and H. Uwe Keller and J. Knollenberg and Rainer Kramm and E. K{\"u}hrt and Michael K{\"u}ppers and Luisa Maria Lara and Monica Lazzarin and C{\'e}dric Leyrat and Jos{\'e} Juan Lopez Moreno and Sara Magrin and Simone Marchi and Francesco Marzari and Matteo Massironi and Harald Michalik and Richard Moissl and Giampiero Naletto and Frank Preusker and L. Sabau and Walter Sabolo and Frank Scholten and Colin Snodgrass and N. Thomas and Cecilia Tubiana and Pierre Vernazza and J.‐B. Vincent and K-P. Wenzel and Thomas P. Andert and Martin P{\"a}tzold and Benjamin P. Weiss},
  journal={Science},
  year={2011},
  volume={334},
  pages={487 - 490}
}
A spacecraft flyby of an asteroid reveals a high-density body that is more like a planetesimal than a rubble pile. Images obtained by the Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) cameras onboard the Rosetta spacecraft reveal that asteroid 21 Lutetia has a complex geology and one of the highest asteroid densities measured so far, 3.4 ± 0.3 grams per cubic centimeter. The north pole region is covered by a thick layer of regolith, which is seen to flow in major… 
Asteroid 21 Lutetia: Low Mass, High Density
TLDR
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.
The Surface Composition and Temperature of Asteroid 21 Lutetia As Observed by Rosetta/VIRTIS
TLDR
Lutetia is likely a remnant of the primordial planetesimal population, unaltered by differentiation processes and composed of chondritic materials of enstatitic or carbonaceous origin, dominated by iron-poor minerals that have not suffered aqueous alteration.
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The European space mission Rosetta, during its still ongoing journey to the comet 67P/Churyumov-Gerasimenko, on 10 July 2010 made an intermediate stop flying close to the asteroid 21 Lutetia at a
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References

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Asteroid 21 Lutetia: Low Mass, High Density
TLDR
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.
The Surface Composition and Temperature of Asteroid 21 Lutetia As Observed by Rosetta/VIRTIS
TLDR
Lutetia is likely a remnant of the primordial planetesimal population, unaltered by differentiation processes and composed of chondritic materials of enstatitic or carbonaceous origin, dominated by iron-poor minerals that have not suffered aqueous alteration.
Asteroids 2867 Steins and 21 Lutetia: surface composition from far infrared observations with the Spitzer space telescope
Aims. The aim of this paper is to investigate the surface composition of the two asteroids 21 Lutetia and 2867 Steins, targets of the Rosetta space mission. Methods. We observed the two asteroids
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Asteroids are what is left of the precursors to the terrestrial planets. They are stunning in their diversity, ranging from charcoal-black worlds the size of a hilltop, spinning like a carnival ride,
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A wide observational campaign was carried out in 2004-2009 aimed to complete the ground-based investigation of Lutetia prior to the Rosetta fly-by in July 2010. We have obtained BVRI photometric and
Physical properties of the ESA Rosetta target asteroid (21) Lutetia. I. The triaxial ellipsoid dimensions, rotational pole, and bulk density
Context. Asteroid (21) Lutetia was the target of the ESA Rosetta mission flyby in 2010 July. Aims. We seek the best size estimates of the asteroid, the direction of its spin axis, and its bulk
Rotational variation of the spectral slope of (21) Lutetia, the second asteroid target of ESA Rosetta mission
The ESA Rosetta mission, launched in 2004 March, will flyby the second asteroid target (21) Lutetia in 2010 July. This asteroid is quite different from (2867) Steins, encountered by Rosetta in 2008
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