Dear List,
Here are 3 more articles from the Dec. 2011 issue of Icarus.
(1) Confirms a good Howardite match for Vesta by DAWN;
(2) DAWN related looks at how CM2 material on Vesta modifies the
Framing Camera spectra;
(3) Looks at Asteroid (101955) 1999 RQ36 and suggests an association
with CM1's
Kijndest wishes
Doug
Ultraviolet spectroscopy of Asteroid (4) Vesta
Pages 640-649
Highlights
► Multi-instrument measurements of Vesta’s geometric albedo in the UV
and visible.
► No UV spectral bluing or lightcurve reversal on Vesta.
► Longitudinal variation of Vesta UV spectral slope matches that in
visible.
► Fine-grained howardite matches Vesta’s spectrum from 220 nm to 950
nm.
► No evidence of space weathering in the UV–visible spectroscopy and
lightcurve.
=================================================================
How to characterize terrains on 4 Vesta using Dawn Framing Camera color
bands?
Pages 376-386
Highlights
► We present methods to classify terrains on Vesta using Dawn Framing
Camera images.
► Effects of exogenous material (CM2) on FC color spectra are also
presented.
► Pseudo Band I minimum can be used to derive ferrosilite content of
the surface.
================================================================
Asteroid (101955) 1999 RQ36: Spectroscopy from 0.4 to 2.4 μm and
meteorite analogs
Pages 462-475
"We speculate that RQ36 is composed of a “CM1”-like material."
► We present reflectance spectra from 0.4 to 2.4 microns of asteroid
(101955) 1999 RQ36.
► RQ36 is the target of the OSIRIS-REx spacecraft mission.
► We performed parametric tests and a least-squares search through
RELAB meteorite data.
► Results show that CI and/or CM meteorites are the most likely
meteorite analogs for RQ36.
► We also compare RQ36 with other known B-type asteroids measured by
Clark et al. (2010).
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