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Thermal Properties of 1847 WISE-observed Asteroids

Hung, Denise and Hanuš, Josef and Masiero, Joseph R. and Tholen, David J. (2022) Thermal Properties of 1847 WISE-observed Asteroids. Planetary Science Journal, 3 (3). Art. No. 56. ISSN 2632-3338. doi:10.3847/psj/ac4d1f.

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We present new thermophysical model fits of 1847 asteroids, deriving thermal inertia, diameter, and Bond and visible geometric albedo. We use thermal flux measurements obtained by the Wide-field Infrared Survey Explorer (WISE) during its fully cryogenic phase, when both the 12 μm (W3) and 22 μm (W4) bands were available. We take shape models and spin information from the Database of Asteroid Models from Inversion Techniques (DAMIT) and derive new shape models through lightcurve inversion and combining WISE photometry with existing DAMIT lightcurves. When we limit our sample to the asteroids with the most reliable shape models and thermal flux measurements, we find broadly consistent thermal inertia relations with recent studies. We apply fits to the diameters D (km) and thermal inertia Γ (J m⁻² s^(−0.5) K⁻¹) normalized to 1 au with a linear relation of the form log[Γ] = α + β log[D], where we find α = 2.667 ± 0.059 and β = −0.467 ± 0.044 for our sample alone and α = 2.509 ± 0.017 and β = −0.352 ± 0.012 when combined with other literature estimates. We find little evidence of any correlation between rotation period and thermal inertia, owing to the small number of slow rotators to consider in our sample. While the large uncertainties on the majority of our derived thermal inertia only allow us to identify broad trends between thermal inertia and other physical parameters, we can expect a significant increase in high-quality thermal flux measurements and asteroid shape models with upcoming infrared and wide-field surveys, enabling even more thermophysical modeling of higher precision in the future.

Item Type:Article
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URLURL TypeDescription Paper
Hung, Denise0000-0001-7523-140X
Hanuš, Josef0000-0002-2934-3723
Masiero, Joseph R.0000-0003-2638-720X
Tholen, David J.0000-0003-0773-1888
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 April 22; revised 2022 January 11; accepted 2022 January 12; published 2022 March 7. We would like to thank the anonymous referees for the valuable and thorough comments. The work of D.H. and D.J.T. are supported by NASA grant Nos. NNX13AI64G and 80NSSC21K0807. The work of J.H. has been supported by INTER-EXCELLENCE grant LTAUSA18093 from the Czech Ministry of Education, Youth, and Sports and by the grant GA20-04431S of the Czech Science Foundation. The technical support and advanced computing resources from University of Hawaii Information Technology Services – Cyberinfrastructure, funded in part by the National Science Foundation MRI award #1920304, are gratefully acknowledged.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministry of Education, Youth, and Sports (Czech Republic)LTAUSA18093
Czech Science FoundationGA20-04431S
Subject Keywords:Asteroids; Main belt asteroids; Astronomy data modeling
Issue or Number:3
Classification Code:Unified Astronomy Thesaurus concepts: Asteroids (72); Main belt asteroids (2036); Astronomy data modeling (1859)
Record Number:CaltechAUTHORS:20220307-189008000
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Official Citation:Denise Hung et al 2022 Planet. Sci. J. 3 56
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113772
Deposited By: George Porter
Deposited On:08 Mar 2022 23:41
Last Modified:08 Mar 2022 23:41

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