Techniques d'observation spectroscopique d'astéroïdes

3.3 The raw spectra of an asteroid and standard star. The twos spectra are modulated
by the absorption bands of the Earth atmosphere (essentially telluric water
bands). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.1 Bus-DeMeo taxonomy key figures. Source :http://smass.mit.edu/
busdemeoclass.html . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
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4.2 a) The photomicrograph of a thin section of the carbonaceous chondrite Allende,
which was seen to fall in Chihuahua, Mexico on the night of February
8, 1969. Numerous round silicate chondrules together with irregular inclusions
can been observed . b) Comparison of solar-system abundances (relative
to silicon) determined by solar spectroscopy and by analysis of carbonaceous
chondrites [Ringwood, 1979]. . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3 Different ways in which space weathering affects the visible and near-infrared
spectra of soil. Space weathering processes alters the properties of the soil
that covers the surface of all bodies which are not protected by an atmosphere
(Source http://en.wikipedia.org/). . . . . . . . . . . . . . . . . . . 71
5.1 M4AST logo and the aims of this project. . . . . . . . . . . . . . . . . . . . . 78
5.2 Block diagram and work flow of M4AST [Popescu et al., 2012b]. . . . . . . . 79
5.3 The database interface of M4AST. Here is illustrated the search of a spectrum
for (1917) Cuyo and the result of this search displayed at the bottom of the
interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
5.4 M4AST web application tool : modelling tool interface . . . . . . . . . . . . . 82
5.5 M4AST web tool application: screen-shoot from the table containing the list of
the closest fifty best matches which are ordered upon the comparison coefficient
(column two of the table). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.6 Classification in Bus-DeMeo taxonomical system for: a)) (99942) Apophis,
and b) (175706) 1996 FG3. All the spectra are normalized to 1.25 µm. . . . . . 84
5.7 Classification in the G-mode taxonomical system for: a) (99942) Apophis using
G13 taxonomy, b) (175706) 1996 FG3 using G13 taxonomy, and c) (175706)
1996 FG3 using G9 taxonomy. All the spectra are normalized either to 1.25
µm (left and central panel), or to 0.55 µm (c). . . . . . . . . . . . . . . . . . . 86