Cryogenic Reflectance Spectroscopy in Support of Planetary Missions

Details Cryogenic Reflectance Spectroscopy in Support of Planetary Missions Cryogenic Reflectance Spectroscopy in Support of Planetary Missions

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nla..work..241d&link_type=abstract

NASA Laboratory Astrophysics Workshop, held May 1-3 2002 at NASA Ames Research Center, Moffett Field, CA 94035-1000. Publisher:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Present understanding of planetary composition is based primarily on remotely-sensed data, and in particular upon ultraviolet, visible, and infrared spectroscopy. Spectra acquired by telescopic and spacecraft instruments are compared to laboratory measurements of pure materials in order to identify surface components based on characteristic absorption features.
Cryogenic spectral measurements are necessary for the study of worlds beyond the Earth's orbit. While some materials exhibit only small spectral changes as a function of temperature (Roush and Dalton 2002), many others are strongly temperature-dependent (Dalton and Clark 1998; Grundy and Schmitt 1998). For example, hydrated salts exhibit different spectral behavior under conditions appropriate to Europa (Dalton 2000) than at terrestrial temperatures (Crowley 1991) . The icy satellites of the outer solar system contain significant quantities of volatile ices (Roush 2001) which do not even exist at standard temperature and pressure (STP).
A comprehensive spectral database of ices and minerals covering a wide temperature range will have applications ranging from the study of comets and Kniper Belt objects to outer planet satellites and the polar regions of Mars. Efforts are presently underway at NASA-Ames to develop capabilities which will contribute to such a database. As spacecraft instruments feature increasing spatial and spectral resolution, appropriate laboratory reference spectra become increasingly critical to accurate interpretation of the spacecraft data.

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