[meteorite-list] 21 Lutetia (article)

From: MexicoDoug <mexicodoug_at_meteoritecentral.com>
Date: Sun, 13 Nov 2011 11:07:31 -0500 (EST)
Message-ID: <8CE70357B481B51-6A8-4B135_at_webmail-m101.sysops.aol.com>

Dear List,

Well, here's the free version spectra of Lutetia and selected enstatite
chondrites:

http://binary-services.sciencedirect.com/content/image/1-s2.0-S0019103511003848-gr1.sml

The full article and more, bigger plots are already available online if
you pay for it:

"Asteroid (21) Lutetia as a remnant of Earth?s precursor
planetesimals", P. Vernazzaa, P. Lamya, O. Groussina, T. Hiroic, L.
Jordaa, P.L. Kingd, M.R.M. Izawae, F. Marchisf, g, M. Birlang, R.
BrunettohIcarus
Volume 216, Issue 2, December 2011, Pages 650-659.

Kindest wishes
Doug


Abstract

Isotopic and chemical compositions of meteorites, coupled with
dynamical simulations, suggest that the main belt of asteroids between
Mars and Jupiter contains objects formed in situ as well as a
population of interlopers. These interlopers are predicted to include
the building blocks of the terrestrial planets as well as objects that
formed beyond Neptune (, and ). Here we report that the main belt
asteroid (21) Lutetia ? encountered by the Rosetta spacecraft in July
2010 ? has spectral (from 0.3 to 25 ?m) and physical (albedo, density)
properties quantitatively similar to the class of meteorites known as
enstatite chondrites. The chemical and isotopic compositions of these
chondrites indicate that they were an important component of the
formation of Earth and other terrestrial planets. This meteoritic
association implies that Lutetia is a member of a small population of
planetesimals that formed in the terrestrial planet region and that has
been scattered in the main belt by emerging protoplanets (Bottke et al.
2006) and/or by the migration of Jupiter (Walsh et al. 2011) early in
its history. Lutetia, along with a few other main-belt asteroids, may
contains part of the long-sought precursor material (or closely related
materials) from which the terrestrial planets accreted.

Highlights


(21) Lutetia has spectral and physical properties similar to enstatite
chondrites.
These meteorites are linked to the formation of Earth and other
terrestrial planets.
This meteoritic association implies that Lutetia formed in the
terrestrial region.

Article Outline
Acknowledgments
Appendix A
A.1. The debate on the nature of Lutetia
A.2. Comparison between the spectral properties of Lutetia and its
likely meteoritic analogs (CO, CV, CK and enstatite chondrites) over
the 0.3-25 ?m range
A.2.1. UV, visible and near infrared spectral range (0.3?2.5 ?m)
A.2.2. Mid-infrared spectral range (8?25 ?m)
A.3. Caveats for an enstatite chondrite?Lutetia association from the
literature (Belskaya et al., 2010): Water on Lutetia and Polarimetry of
Lutetia
A.4. Density and internal structure of Lutetia
Received on Sun 13 Nov 2011 11:07:31 AM PST