Techniques d'observation spectroscopique d'astéroïdes

96 CHAPTER 6. SPECTRAL PROPERTIES OF NEAR-EARTH ASTEROIDS
(188452) 2004 HE62, and 2010 TD54. The summary of the results obtained by matching
the asteroid spectra and the de-reddened asteroid spectra with spectra from the Relab database
is given in Table 6.4.
(1917) Cuyo
Taxonomic classification for (1917) Cuyo
1.2
1.1
1.2
1.1
tel-00785991, version 1 - 7 Feb 2013
Relative Reflectance
(a)
Relative Reflectance
(c)
1
0.9
0.8
0.7
0.6
0.5
0.09
0.08
0.07
0.06
0.05
0.04
0.03
V
NIR
0.5 1 1.5 2 2.5
Wavelength [um]
Asteroid
Relab sample
0.5 1 1.5 2 2.5
Wavelength [um]
Relative Reflectance
(b)
Relative Reflectance
(d)
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.28
0.26
0.24
0.22
0.2
Spectrum
Sr
R
0.5 1 1.5 2 2.5
Wavelength [um]
Asteroid
Relab sample
0.5 1 1.5 2 2.5
Wavelength [um]
Figure 6.1: a) The visible [Binzel et al., 2004b] and the NIR spectrum of (1917) Cuyo; b) a polynomial fit of the
V+NIR spectrum of (1917) Cuyo compared with the theoretical spectra of R and Sr types; c) reflectance spectrum
of (1917) Cuyo and the closest match resulting from meteorite comparison - H3-4 ordinary chondrite Dhajala; d)
De-reddened spectrum of (1917) Cuyo and the closest match resulting from meteorite comparison, H6 ordinary
chondrite Lancon.
6.2.1 (1917) Cuyo
With an absolute magnitude H = 14.7, this object has an estimated diameter of 5.2 km [Binzel et al.,
2002]. It is an Amor-type asteroid, with a rotation period of 2.6905±0.0005 hrs [Wisniewski et al.,
1997].
Two spectra in the visible wavelengths are published for this object. For the first one,
Binzel et al. [2004b] found that this asteroid is a Sl-type in Bus taxonomy, with a high slope of
(0.7233 µm −1 ). The second one was classified by Michelsen et al. [2006] as an S-type asteroid
in Tholen taxonomy. I joined the visible spectrum from the SMASS database [Binzel et al.,