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Title:
Low Perihelion Near-Earth Asteroids
Authors:
Campins, Humberto; Kelley, Michael S.; Fernández, Yanga; Licandro, Javier; Hargrove, Kelsey
Affiliation:
AA(University of Central Florida; , Instituto de Astrofísica de Canarias), AB(University of Central Florida), AC(University of Central Florida), AD(Instituto de Astrofísica de Canarias), AE(University of Central Florida)
Publication:
Earth, Moon, and Planets, Volume 105, Issue 2-4, pp. 159-165 (EM&P Homepage)
Publication Date:
09/2009
Origin:
SPRINGER
Keywords:
Asteroids, Infrared spectra, Surface composition, Orbital dynamics
DOI:
10.1007/s11038-009-9310-2
Bibliographic Code:
2009EM&P..105..159C

Abstract

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 <CitationRef CitationID="CR2">2004</CitationRef>); 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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