Bibcode
Campins, Humberto; Kelley, Michael S.; Fernández, Yanga; Licandro, Javier; Hargrove, Kelsey
Referencia bibliográfica
Earth, Moon, and Planets, Volume 105, Issue 2-4, pp. 159-165
Fecha de publicación:
9
2009
Número de citas
17
Número de citas referidas
16
Descripción
We present initial results from a study of a sample of low-perihelion
near-Earth asteroids (NEAs) using the Infrared Spectrograph (IRS) on
NASA’s Spitzer Space Telescope. The 7-14 μm thermal emission
spectra have been fitted with models of the thermal continuum to derive
the asteroid’s effective diameter, geometric albedo and beaming
parameter η. In this work, we concentrate on the thermal behavior
and we find a trend of increasing η (lower thermal fluxes and cooler
color temperatures) with increasing solar phase angle. The slope of this
trend is somewhat different from that reported for other NEAs (e.g.,
Delbó 2004); if confirmed, this result
would indicate that the thermal behavior of low-perihelion asteroids is
different from that of other members of the NEA population. In addition,
deviations of the observed continuum from the thermal model, which can
be diagnostic of composition, are apparent in a few of our targets. A
complete characterization of these intrinsically faint objects will
benefit from the large ground based facilities described elsewhere in
these proceedings.
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