Bibcode
de León, J.; Licandro, J.; Duffard, R.; Serra-Ricart, M.
Bibliographical reference
Advances in Space Research, Volume 37, Issue 1, p. 178-183.
Advertised on:
2006
Journal
Citations
36
Refereed citations
35
Description
We present visible and near-infrared spectra (0.5 2.4 μm) of 11 Near
Earth Asteroids obtained with the telescopes at the “Observatorio
del Roque de los Muchachos” in La Palma, Spain. A spectral
analysis of the obtained data is performed in order to establish the
taxonomical classification of the observed asteroids. We use the method
outlined by Cloutis et al. [Cloutis, E.A., Gaffey, M.J., Jackowski, T.L.
Calibrations of phase abundance, composition, and particle size
distribution for olivine-orthopyroxene mixtures from reflectance
spectra. J. Geophys. Res. 91, B11, 11641 11653, 1986] and Gaffey et al.
[Gaffey, M.J., Bell, J.F., Brown, R.H. Mineralogical variations within
the S-type asteroid class. Icarus 106, 573 602, 1993] to obtain spectral
parameters that provide us with information about their surface
composition. We found 2 V-type asteroids and 9 S-type asteroids,
including several compositional subtypes.We also use the Modified
Gaussian Model (MGM) method developed by Sunshine et al. [Sunshine,
J.M., Pieters, C.M., Pratt, S.F. Deconvolution of mineral absorption
bands: an improved approach. J. Geophys. Res. 95, B5, 6955 6966, 1990]
to extract further mineralogical information from the spectra of two of
these asteroids, those classified as V-type. We obtain a surface
compositional proportion of about 70% of orthopyroxene and 30% of
clinopyroxene for both asteroids.