OSIRIS-REx Science WBS 40

Project: Research project

Description

WBS 4.4 - Asteroid Science WBS 4.4.2 - Asteroid Environment Task 1) Develop quantitative thennal analysis models and software tools that will be used to detennine and map the surface kinetic temperature distribution ofRQ36 using the OTES infrared spectral data. The results of the algorithms will be used as inputs to thermal models used to derived the surface particle size distribution. This task will involve developing and testing algorithms to translate the OTES calibrated emitted radiance data into surface temperature distributions using temperature/emissivity separation techniques. A key OTES mission objective is to detennine and map the particle size distribution of the surface of RQ36 in order to select the optimal sample collection site. The physical limitation of .... 2 em diameter particles for the TAGSAM collection system, together with the desire to collect the maximum amount of sample as well as sample a range of particle sizes, make the determination of the surface particle size distribution essential. Particle size can be inferred from thermal inertia, which is in tum derived from multiple time of day temperature measurements. However, no natural surface is composed of uniformly sized particles, and therefore there is no single temperature that represents a given surface. In order to correctly determine the particle size distribution it will be necessary to model the true ~istribution of surface temperatures and then infer the true distribution of particle sizes. This can be achieved by using the full spectral range and spectral resolution of the OTES spectrometer together with multiple time of day OTES
StatusActive
Effective start/end date6/1/139/30/20

Funding

  • National Aeronautics Space Administration (NASA): $3,751,385.00

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OSIRIS
particle size
asteroid
surface temperature
temperature
science
emissivity
spectral resolution
inertia
radiance
quantitative analysis
spectrometer
software
kinetics