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    OSIRISREx Visible and NearInfrared Observations of the Moon (2019)
    In:  Other Sources
    Details
    Publikationsdatum: 2020-01-04
    Beschreibung: The Origins, Spectral Interpretation, Resource Identification, and Security Regolith Explorer(OSIRISREx) mission observed the The Origins, Spectral Interpretation, Resource Identification, and SecurityRegolith Explorer (OSIRISREx) mission observed the Moon during the spacecraft's Earth gravity assist in 2017. From the spacecraft view, the lunar phase was 42, and the inview hemisphere was dominated by anorthositic highlands terrain. Lunar spectra obtained by the OSIRISREx Visible and InfraRed Spectrometer show evidence of several candidate absorption features. We observe the 2.8m hydration band, confirming the spectral results from other missions, but detected in fulldisk spectra. We also tentatively identify weak spectral features near 0.9 and 1.3 m, consistent with lunar regolith containing a mixture of plagioclase and orthopyroxene minerals, as expected for highlands terrain.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: GSFC-E-DAA-TN76610 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 12; 6322-6326
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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    Mercury: First Spectra from 8 to 25 Microns Using MIRSI (2005)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-11
    Beschreibung: Spectral measurements from 8 to 25 microns of Mercury's surface were taken using MIRSI (Mid-InfraRed Spectrometer and Imager) mounted on the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii [1]. Few spectral observations of Mercury have been made between 8 and 14 m and these are the first to be made between 17 and 25 m. The goal for these observations is to measure the emission from Mercury in the Restrahllen Bands in the 8 to 25 micron region in an effort to identify spectral features that may give clues to Mercury s composition. These observations will be compared to previous observations [2] [3] [4], and future observations made with instrumentation on Messenger at other spectral regions [5]. Spectra from the Moon were also obtained with the same instrumentation and telescope during the same observing periods.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Lunar and Planetary Science XXXVI, Part 4; LPI-Contrib-1234-Pt-4
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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    Properties of Rubble-Pile Asteroid (101955) Bennu from OSIRIS-REx Imaging and Thermal Analysis (2019)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-14
    Beschreibung: Establishing the abundance and physical properties of regolith and boulders on asteroids is crucial for understanding the formation and degradation mechanisms at work on their surfaces. Using images and thermal data from NASA's Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft, we show that asteroid (101955) Bennu's surface is globally rough, dense with boulders, and low in albedo. The number of boulders is surprising given Bennu's moderate thermal inertia, suggesting that simple models linking thermal inertia to particle size do not adequately capture the complexity relating these properties. At the same time, we find evidence for a wide range of particle sizes with distinct albedo characteristics. Our findings imply that ages of Bennu's surface particles span from the disruption of the asteroid's parent body (boulders) to recent in situ production (micrometre-scale particles).
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: GSFC-E-DAA-TN67770 , Nature Astronomy (e-ISSN 2397-3366); 3; 341–351
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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