Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers

1. Spirit

Jeffrey R. Johnson, William M. Grundy, Mark T. Lemmon, James Bell, Miles J. Johnson, Robert G. Deen, Raymond E. Arvidson, William H. Farrand, Edward A. Guinness, Alexander G. Hayes, Ken E. Herkenhoff, Frank Seelos IV, Jason Soderblom, Steve Squyres

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Multispectral observations of rocks and soils were acquired under varying illumination and viewing geometries in visible/near-infrared wavelengths by the Panoramic Camera (Pancam) on the Spirit Mars Exploration Rover to provide constraints on the physical and mineralogical nature of geologic materials in Gusev Crater. Data sets were acquired at six sites located near the landing site, in the surrounding plains, and in the West Spur and Husband Hill regions of the Columbia Hills. From these ∼600 images, over 10,000 regions of interest were selected of rocks and soils over a wide range of phase angles (0-130°). Corrections for diffuse skylight incorporated sky models based on observations of atmospheric opacity throughout the mission. Disparity maps created from Pancam stereo images allowed inclusion of estimates of local facet orientations in the sky models. Single-term and two-term phase functions derived from Hapke scattering models exhibit a dominantly broad backscattering trend for soils and "Red" rocks inferred to be covered with variable amounts of dust and other coatings, consistent with the results from the Viking Lander and Imager for Mars Pathfinder cameras. Darker "Gray" rock surfaces (inferred to be relatively less dust covered) display more narrow, forward scattering behaviors, consistent with particles exhibiting little internal scattering. Gray and Red rocks are macroscopically rougher than most soil units, although a "dust-cleaning" event observed near the Paso Robles site caused an increase in soil surface roughness in addition to a substantial decrease in surface single scattering albedo. Gray rocks near the rim of Bonneville Crater exhibit the largest macroscopic roughness (θ̄) among all units, as well as the greatest backscattering among Gray rocks. Photometric properties of coated Red rocks vary in the West Spur region, possibly as a result of weathering differences related to elevation-dependent aeolian regimes.

Original languageEnglish (US)
Article numberE02S14
JournalJournal of Geophysical Research E: Planets
Volume111
Issue number2
DOIs
StatePublished - Feb 20 2006
Externally publishedYes

Fingerprint

panoramic cameras
Mars exploration
Mars
Cameras
Rocks
rocks
soils
rock
Soils
scattering
Dust
dust
Scattering
Backscattering
craters
crater
sky
backscattering
soil
Surface roughness

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers : 1. Spirit. / Johnson, Jeffrey R.; Grundy, William M.; Lemmon, Mark T.; Bell, James; Johnson, Miles J.; Deen, Robert G.; Arvidson, Raymond E.; Farrand, William H.; Guinness, Edward A.; Hayes, Alexander G.; Herkenhoff, Ken E.; Seelos IV, Frank; Soderblom, Jason; Squyres, Steve.

In: Journal of Geophysical Research E: Planets, Vol. 111, No. 2, E02S14, 20.02.2006.

Research output: Contribution to journalArticle

Johnson, JR, Grundy, WM, Lemmon, MT, Bell, J, Johnson, MJ, Deen, RG, Arvidson, RE, Farrand, WH, Guinness, EA, Hayes, AG, Herkenhoff, KE, Seelos IV, F, Soderblom, J & Squyres, S 2006, 'Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers: 1. Spirit', Journal of Geophysical Research E: Planets, vol. 111, no. 2, E02S14. https://doi.org/10.1029/2005JE002494
Johnson, Jeffrey R. ; Grundy, William M. ; Lemmon, Mark T. ; Bell, James ; Johnson, Miles J. ; Deen, Robert G. ; Arvidson, Raymond E. ; Farrand, William H. ; Guinness, Edward A. ; Hayes, Alexander G. ; Herkenhoff, Ken E. ; Seelos IV, Frank ; Soderblom, Jason ; Squyres, Steve. / Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers : 1. Spirit. In: Journal of Geophysical Research E: Planets. 2006 ; Vol. 111, No. 2.
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