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Comparison of Observed Surface Temperatures of 4 Vesta to the KRC Thermal ModelIn this work, we will compare ob-served temperatures of the surface of Vesta using data acquired by the Dawn [1] Visible and Infrared Map-ping Spectrometer (VIR-MS) [2] during the approach phase to model results from the KRC thermal model. High thermal inertia materials, such as bedrock, resist changes in temperature while temperatures of low thermal inertia material, such as dust, respond quickly to changes in solar insolation. The surface of Vesta is expected to have low to medium thermal inertia values, with the most commonly used value being extremely low at 15 TIU [4]. There are several parameters which affect observed temperatures in addition to thermal inertia: bond albedo, slope, and surface roughness. In addition to these parameters, real surfaces are rarely uniform monoliths that can be described by a single thermal inertia value. Real surfaces are often vertically layered or are mixtures of dust and rock. For Vesta's surface, with temperature extremes ranging from 50 K to 275 K and no atmosphere, even a uniform monolithic surface may have non-uniform thermal inertia due to temperature dependent thermal conductivity.
Document ID
20120002939
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Titus, T. N. (Geological Survey Flagstaff, AZ, United States)
Becker, K. J. (Geological Survey Flagstaff, AZ, United States)
Anderson, J. A. (Geological Survey Flagstaff, AZ, United States)
Capria, M. T. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Tosi, F. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
DeSanctis, M. C. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Palomba, E. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Grassi, D. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Capaccioni, F. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Ammannito, E. (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Combe, J.-P. (Bear Fight Inst., Inc. Winthrop, WA, United States)
McCord, T. B. (Bear Fight Inst., Inc. Winthrop, WA, United States)
Li, J.-Y. (Maryland Univ. College Park, MD, United States)
Russell, C. T. (California Univ. Los Angeles, CA, United States)
Ryamond, C. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mittlefehldt, D. (NASA Johnson Space Center Houston, TX, United States)
Toplis, M. (Observatoire de Midi-Pyrenees Toulouse, France)
Forni, O. (Institut de Recherche en Astrophysique et Planetologie (UMR) Toulouse, France)
Sykes, M. V. (Planetary Science Inst. Tucson, AZ, United States)
Date Acquired
August 25, 2013
Publication Date
March 19, 2012
Subject Category
Astronomy
Report/Patent Number
JSC-CN-25899
Meeting Information
Meeting: 43rd Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 19, 2012
End Date: March 23, 2012
Sponsors: Lunar and Planetary Inst.
Funding Number(s)
CONTRACT_GRANT: NNX11AC28G
Distribution Limits
Public
Copyright
Public Use Permitted.

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