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Investigation of systematic bias in radiometric diameter determination of near-Earth asteroids: the night emission simulated thermal model (NESTM)

Wolters, Stephen D. and Green, Simon F. (2009). Investigation of systematic bias in radiometric diameter determination of near-Earth asteroids: the night emission simulated thermal model (NESTM). Monthly Notices of the Royal Astronomical Society, 400(1) pp. 204–218.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1111/j.1365-2966.2009.14996.x
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Abstract

The near-Earth asteroid thermal model (NEATM) has proven to be a reliable simple thermal model for radiometric diameter determination. However, NEATM assumes zero thermal emission on the night side of an asteroid. We investigate how this assumption affects the best-fitting beaming parameter η, overestimates the effective diameter Deff and underestimates the albedo pv at large phase angles, by testing NEATM on thermal infrared fluxes generated from simulated asteroid surfaces with different thermal inertia Γ. We compare NEATM to radar diameters and find that NEATM overestimates the diameter when η is fitted to multiwavelength observations and underestimates the diameter when default η is used. The night emission simulated thermal model (NESTM) is introduced. NESTM models the night side temperature (Tnight) as an iso-latitudinal fraction (f) of the maximum day side temperature (Tmax calculated for NEATM with η= 1 ): Tnight=fTmax cos1/4φ , where φ is the latitude. A range of f is found for different thermal parameters, which depend on Γ. NESTM diameters are compared with NEATM and radar diameters, and it is shown that NESTM may reduce the systematic bias in overestimating diameters. It is suggested that a version of the NESTM which assumes Γ= 200 J m−2 s−1/2 K−1 is adopted as a default model when the solar phase angle is greater than 45°.

Item Type: Journal Article
Copyright Holders: 2009 RAS
ISSN: 1365-2966
Extra Information: The definitive version is available at www.blackwell-synergy.com
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 20196
Depositing User: Stephen Wolters
Date Deposited: 02 Mar 2010 09:30
Last Modified: 17 Jul 2013 08:47
URI: http://oro.open.ac.uk/id/eprint/20196
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