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Asteroid Diameters and Albedos from NEOWISE Reactivation Mission Years Six and Seven

Masiero, Joseph R. and Mainzer, A. K. and Bauer, J. M. and Cutri, R. M. and Grav, T. and Kramer, E. and Pittichová, J. and Wright, E. L. (2021) Asteroid Diameters and Albedos from NEOWISE Reactivation Mission Years Six and Seven. Planetary Science Journal, 2 (4). Art. No. 162. ISSN 2632-3338. doi:10.3847/PSJ/ac15fb. https://resolver.caltech.edu/CaltechAUTHORS:20210813-181204409

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Abstract

We present diameters and albedos computed for the near-Earth and main belt asteroids (MBAs) observed by the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) spacecraft during the sixth and seventh years of its Reactivation mission. These diameters and albedos are calculated from fitting thermal models to NEOWISE observations of 199 near-Earth objects (NEOs) and 5851 MBAs detected during the sixth year of the survey and 175 NEOs and 5861 MBAs from the seventh year. Comparisons of the NEO diameters derived from Reactivation data with those derived from the WISE cryogenic mission data show a ~30% relative uncertainty. This larger uncertainty compared to data from the cryogenic mission is due to the need to assume a beaming parameter for the fits to the shorter-wavelength data that the Reactivation mission is limited to. We also present an analysis of the orbital parameters of the MBAs that have been discovered by NEOWISE during Reactivation, finding that these objects tend to be on orbits that result in their perihelia being far from the ecliptic, and thus missed by other surveys. To date, the NEOWISE Reactivation survey has provided thermal fits of 1415 unique NEOs. Including the mission phases before spacecraft hibernation increases the count of unique NEOs characterized to 1845 from WISE's launch to the present.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/psj/ac15fbDOIArticle
https://arxiv.org/abs/2107.07481arXivDiscussion Paper
ORCID:
AuthorORCID
Masiero, Joseph R.0000-0003-2638-720X
Bauer, J. M.0000-0001-9542-0953
Cutri, R. M.0000-0002-0077-2305
Grav, T.0000-0002-3379-0534
Kramer, E.0000-0003-0457-2519
Pittichová, J.0000-0002-5736-1857
Wright, E. L.0000-0001-5058-1593
Additional Information:© 2021. 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 May 5; revised 2021 July 15; accepted 2021 July 15; published 2021 August 12. The authors thank the two anonymous referees for their comments, which improved the manuscript. 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 joint project of the University of Arizona and 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 research has made use of the NASA/IPAC Infrared Science Archive, which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. This research has made use of NASA's Astrophysics Data System. This research has made extensive use of the numpy, scipy, and matplotlib Python packages. The authors also acknowledge the efforts of worldwide NEO follow-up observers, both professional and nonprofessional, 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 Planetary Defense Coordination Office, for which we are grateful.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:Asteroids; Near-Earth objects; Infrared astronomy
Issue or Number:4
Classification Code:Unifed Astronomy Thesaurus concepts: Asteroids (72); Near-Earth objects (1092); Infrared astronomy (786)
DOI:10.3847/PSJ/ac15fb
Record Number:CaltechAUTHORS:20210813-181204409
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210813-181204409
Official Citation:Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110266
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:13 Aug 2021 21:21
Last Modified:13 Aug 2021 21:21

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