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NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos

Masiero, Joseph R. and Nugent, C. and Mainzer, A. K. and Wright, E. L. and Bauer, J. M. and Cutri, R. M. and Grav, T. and Kramer, E. and Sonnett, S. (2017) NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos. Astronomical Journal, 154 (4). Art. No. 168. ISSN 1538-3881. doi:10.3847/1538-3881/aa89ec.

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The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) reactivation mission has completed its third year of surveying the sky in the thermal infrared for near-Earth asteroids and comets. NEOWISE collects simultaneous observations at 3.4 and 4.6 μm of solar system objects passing through its field of regard. These data allow for the determination of total thermal emission from bodies in the inner solar system, and thus the sizes of these objects. In this paper, we present thermal model fits of asteroid diameters for 170 NEOs and 6110 Main Belt asteroids (MBAs) detected during the third year of the survey, as well as the associated optical geometric albedos. We compare our results with previous thermal model results from NEOWISE for overlapping sample sets, as well as diameters determined through other independent methods, and find that our diameter measurements for NEOs agree to within 26% (1σ) of previously measured values. Diameters for the MBAs are within 17% (1σ). This brings the total number of unique near-Earth objects characterized by the NEOWISE survey to 541, surpassing the number observed during the fully cryogenic mission in 2010.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Masiero, Joseph R.0000-0003-2638-720X
Wright, E. L.0000-0001-5058-1593
Cutri, R. M.0000-0002-0077-2305
Grav, T.0000-0002-3379-0534
Kramer, E.0000-0003-0457-2519
Sonnett, S.0000-0003-2762-8909
Additional Information:© 2017 The American Astronomical Society. Received 2017 July 8; revised 2017 August 29; accepted 2017 August 30; published 2017 September 29. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This publication also makes use of data products from NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the Planetary Science Division of the National Aeronautics and Space Administration. This research has made use of data and services provided by the International Astronomical Union's Minor Planet Center. This publication uses data obtained from the NASA Planetary Data System (PDS). This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Based on observations obtained at the Gemini Observatory through a Gemini Large and Long Program, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). Finally, the authors acknowledge the efforts of NEO follow-up observers around the world who provide time-critical astrometric measurements of newly discovered NEOs, enabling object recovery and computation of orbital elements. Many of these efforts would not be possible without the financial support of the NASA Near-Earth Object Observations Program.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:minor planets, asteroids: general
Issue or Number:4
Record Number:CaltechAUTHORS:20170929-084147768
Persistent URL:
Official Citation:Joseph R. Masiero et al 2017 AJ 154 168
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81914
Deposited By: Tony Diaz
Deposited On:29 Sep 2017 16:44
Last Modified:15 Nov 2021 19:47

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