Space-Based Thermal Infrared Studies of Asteroids

Mainzer, Amy; Usui, Fumihiko; Trilling, David E.

doi:10.2458/azu_uapress_9780816532131-ch005

Cited by 18 publications

(21 citation statements)

References 159 publications

(197 reference statements)

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“…The infrared NEOWISE project (Mainzer et al 2011a) has measured diameters and albedos for ∼20% of the known asteroid population, the majority of these measurements to date (Grav et al , 2012cMainzer et al 2011bMainzer et al , 2012Mainzer et al , 2015Masiero et al 2011Masiero et al , 2012Bauer et al 2013). Here, we expand the number of asteroids characterized by NEOWISE, deriving diameters and albedos for asteroids detected by NEOWISE between 2013 December 13 and 2014 December 13 during the first year of the Reactivation mission.…”

Section: Introductionmentioning

confidence: 99%

NEOWISEREACTIVATION MISSION YEAR ONE: PRELIMINARY ASTEROID DIAMETERS AND ALBEDOS

Nugent

Mainzer

Masiero

et al. 2015

ApJ

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We present preliminary diameters and albedos for 7956 asteroids detected in the first year of the NEOWISE Reactivation mission. Of those, 201 are near-Earth asteroids and 7755 are Main Belt or Mars-crossing asteroids. 17% of these objects have not been previously characterized using the Near-Earth Object Wide-field Infrared Survey Explorer, or "NEOWISE " thermal measurements. Diameters are determined to an accuracy of ∼20% or better. If good-quality H magnitudes are available, albedos can be determined to within ∼40% or better.

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Section: Introductionmentioning

confidence: 99%

NEOWISEREACTIVATION MISSION YEAR ONE: PRELIMINARY ASTEROID DIAMETERS AND ALBEDOS

Nugent

Mainzer

Masiero

et al. 2015

ApJ

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“…NEOs are the parent bodies of meteorites, one of our key sources of detailed knowledge about the solar system's development, and NEO studies provide the needed context for this work. The space exploration of NEOs is carried out both through robotic spacecraft such as NEAR (Veverka et al 2001), Hayabusa (Fujiwara et al 2006), Chang'e2 (Ji et al 2016), Hayabusa2 (Abe et al 2012), and OSIRIS-REx (Lauretta et al 2015) and with remote sensing observations using IRAS, Spitzer, WISE/NEO-WISE, Akari, and other assets (as reviewed in Mainzer et al 2015). Energetically, some NEOs are easier to reach with spacecraft than Earth's moon (Barbee et al 2013), and NEOs offer a large number of targets with a range of physical properties and histories.…”

Section: Introductionmentioning

confidence: 99%

Neosurvey 1: Initial Results From the Warm Spitzer Exploration Science Survey of Near-Earth Object Properties

Trilling

Mommert

Hora

et al. 2016

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Near-Earth objects (NEOs) are small solar system bodies whose orbits bring them close to the Earth's orbit. We are carrying out a Warm Spitzer Cycle11 Exploration Science program entitled NEOSurvey-a fast and efficient fluxlimited survey of 597known NEOs in which we derive a diameter and albedo for each target. The vast majority of our targets are too faint to be observed by NEOWISE, though a small sample has been or will be observed by both observatories, which allows for a cross-check of our mutual results. Our primary goal is to create a large and uniform catalog of NEO properties. We present here the first results from this new program: fluxes and derived diameters and albedos for 80NEOs, together with a description of the overall program and approach, including several updates to our thermal model. The largest source of error in our diameter and albedo solutions, which derive from our single-band thermal emission measurements, is uncertainty in η, the beaming parameter used in our thermal modeling; for albedos, improvements in solar system absolute magnitudes would also help significantly. All data and derived diameters and albedos from this entire program are being posted on a publicly accessible Web page at nearearthobjects.nau.edu .

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“…From these, we can anticipate further scientific potential for more sophisticated thermo-physical modelling based on the combination of AKARI, WISE/NEOWISE, IRAS, Spitzer, Herschel and other sources (e.g. Mainzer et al 2015). For example, we are starting to gather enough thermal IR observations before and after opposition for some key objects, which would be especially helpful to constrain surface thermo-physical properties whenever three-dimensional shape and spin axis orientation are available.…”

Section: Outlook and Concluding Remarksmentioning

confidence: 99%

The AKARI IRC asteroid flux catalogue: updated diameters and albedos

Alí-Lagoa

Müller

Usui

et al. 2018

A&A

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The AKARI IRC All-sky survey provided more than twenty thousand thermal infrared observations of over five thousand asteroids. Diameters and albedos were obtained by fitting an empirically calibrated version of the standard thermal model to these data. After the publication of the flux catalogue in October 2016, our aim here is to present the AKARI IRC all-sky survey data and discuss valuable scientific applications in the field of small body physical properties studies. As an example, we update the catalogue of asteroid diameters and albedos based on AKARI using the near-Earth asteroid thermal model (NEATM). We fit the NEATM to derive asteroid diameters and, whenever possible, infrared beaming parameters. We fit groups of observations taken for the same object at different epochs of the survey separately, so we compute more than one diameter for approximately half of the catalogue. We obtained a total of 8097 diameters and albedos for 5170 asteroids, and we fitted the beaming parameter for almost two thousand of them. When it was not possible to fit the beaming parameter, we used a straight line fit to our sample's beaming parameter-versus-phase angle plot to set the default value for each fit individually instead of using a single average value. Our diameters agree with stellar-occultation-based diameters well within the accuracy expected for the model. They also match the previous AKARI-based catalogue at phase angles lower than 50 degrees, but we find a systematic deviation at higher phase angles, at which near-Earth and Mars-crossing asteroids were observed. The AKARI IRC All-sky survey is an essential source of information about asteroids, especially the large ones, since, it provides observations at different observation geometries, rotational coverages and aspect angles. For example, by comparing in more detail a few asteroids for which dimensions were derived from occultations, we discuss how the multiple observations per object may already provide three-dimensional information about elongated objects even based on an idealised model like the NEATM. Finally, we enumerate additional expected applications for more complex models, especially in combination with other catalogues.

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Space-Based Thermal Infrared Studies of Asteroids

Cited by 18 publications

References 159 publications

NEOWISEREACTIVATION MISSION YEAR ONE: PRELIMINARY ASTEROID DIAMETERS AND ALBEDOS

NEOWISEREACTIVATION MISSION YEAR ONE: PRELIMINARY ASTEROID DIAMETERS AND ALBEDOS

Neosurvey 1: Initial Results From the Warm Spitzer Exploration Science Survey of Near-Earth Object Properties

The AKARI IRC asteroid flux catalogue: updated diameters and albedos

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