The Earth, Planets and Space Special Issue: “Science of solar system materials examined from Hayabusa and future missions”

Okada, Tatsuaki; Zolensky, M. E.; Ireland, Trevor; Yada, Toru

doi:10.1186/s40623-015-0235-x

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…Building on these coherent indications from previous literature, we decided in this work to focus on the experimental verification of the effect of increasing emergence angle on emissivity measurements for asteroid analogue materials, taking into high consideration the results from the Hayabusa mission (Okada et al 2015). We therefore selected a fine particle sample of meteorite Millbillillie, an achondritic eucrite originating from asteroid Vesta (Hiroi et al 1995;McSween et al 2013;Mittelfehldt 2014), and a synthetic enstatite to represent E-type asteroids (Zellner et al 1977), both reduced to <25 µm as analogues for asteroid surface.…”

Section: Introductionmentioning

confidence: 99%

On the effect of emergence angle on emissivity spectra: application to small bodies

et al. 2016

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Dependence of laboratory-measured emissivity spectra from the emergence angle is a subject that still needs a lot of investigations to be fully understood. Most of the previous work is based on reflectance measurements in the VIS-NIR spectral region and on emissivity measurements of flat, solid surfaces (mainly metals), which are not directly applicable to the analysis of remote sensing data. Small bodies in particular (c.f. asteroids Itokawa and 1999JU3, the respective targets of JAXA Hayabusa and Hayabusa 2 missions) have a very irregular surface; hence, the spectra from those rough surfaces are difficult to compare with laboratory spectra, where the observing geometry is always close to "nadir. " At the Planetary Emissivity Laboratory of the German Aerospace Center (DLR), we have set up a series of spectral measurements to investigate this problem in the 1-to 16-µm spectral region. We measured the emissivity for two asteroid analogue materials (meteorite Millbillillie and a synthetic enstatite) in vacuum and under purged air, at surface temperature of 100 °C, for emergence angles of 0°, 5°, 10°, 20°, 30°, 40°, 50°, and 60°. Emissivity of a serpentinite slab, already used as calibration target for the MARA instrument on Hayabusa 2 MASCOT lander and for the thermal infrared imager spectrometer on Hayabusa 2 orbiter, was measured under the same conditions. Additionally, a second basalt slab was measured. Both slabs were not measured at 5° inclination. Complementary reflectance measurements of the four samples were taken. For all the samples measured, we found that for calibrated emissivity, significant variations from values obtained at nadir (0° emergence angle) appear only for emergence angles ≥40°. Reflectance measurements confirmed this finding, showing the same trend of variations.

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Section: Introductionmentioning

confidence: 99%

On the effect of emergence angle on emissivity spectra: application to small bodies

et al. 2016

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“…The outcome of these studies provide constraints to understand the evolution of the Earth-Moon system and inner solar system (e.g., Lucey et al 2006;Stöffler et al 2006). The geochemical and chronological constraints developed based on lunar regolith studies can be applied to the surfaces of other solar system objects and used as a guide for future and ongoing missions like Hayabusa (Tsuda et al 2013;Okada et al 2015) to a C-type asteroid 1999 JU3, OSIRIS-REx sample return mission (Lauretta and Team 2012) to the asteroid 101955 Bennu, and the Mars Science Laboratory (Grotzinger et al 2012), currently conducting experiments on the Martian surface. Kring (2015) describes how the success of NASA's Orion crew vehicle, as well as the outcome of current lunar orbiters, has revitalized future interest in robotic and human exploration programs to the moon and beyond.…”

Section: Introductionmentioning

confidence: 99%

40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461

2016

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Hayabusa2 Sample Catcher and Container: Metal-Seal System for Vacuum Encapsulation of Returned Samples with Volatiles and Organic Compounds Recovered from C-Type Asteroid Ryugu

Okazaki¹,

Sawada²,

Yamanouchi³

et al. 2016

Hayabusa2

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The Earth, Planets and Space Special Issue: “Science of solar system materials examined from Hayabusa and future missions”

Cited by 5 publications

References 25 publications

On the effect of emergence angle on emissivity spectra: application to small bodies

On the effect of emergence angle on emissivity spectra: application to small bodies

40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461

Hayabusa2 Sample Catcher and Container: Metal-Seal System for Vacuum Encapsulation of Returned Samples with Volatiles and Organic Compounds Recovered from C-Type Asteroid Ryugu

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