D
David E. Harker
Researcher at University of California
Publications - 36
Citations - 1362
David E. Harker is an academic researcher from University of California. The author has contributed to research in topics: Comet & Silicate. The author has an hindex of 16, co-authored 36 publications receiving 1223 citations. Previous affiliations of David E. Harker include National Research Council & University of Hawaii.
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Journal ArticleDOI
Silicate Mineralogy of the Dust in the Inner Coma of Comet C/1995 01 (Hale-Bopp) Pre- and Postperihelion
D. H. Wooden,D. H. Wooden,David E. Harker,David E. Harker,Charles E. Woodward,Charles E. Woodward,Harold M. Butner,Chiyoe Koike,Fred C. Witteborn,Fred C. Witteborn,Craig W. McMurtry,Craig W. McMurtry +11 more
TL;DR: In this paper, the authors present 7.6 - 13.3 microns infrared (IR) spectrophotometry (R approx. = 180 - 350) of the 10 microns silicate emission from dust in the inner coma (i.e., within a diameter of 3in.) of comet C/1995 O1 (Hale-Bopp) at four temporal epochs from 1996 October through 1997 June during the approach to, arrival at, and recession from perihelion.
Journal ArticleDOI
Annealing of Silicate Dust by Nebular Shocks at 10 AU
TL;DR: In this paper, it was shown that in situ annealing of micron-sized dust grains can occur, obviating the need for large-scale radial transport, and the peak temperatures of pyroxene grains under conditions typical in protoplanetary disks at 5-10 AU.
Journal ArticleDOI
The Mars Science Laboratory Curiosity rover Mastcam instruments: Preflight and in-flight calibration, validation, and data archiving
James F. Bell,A. Godber,S. McNair,Michael Caplinger,Justin N. Maki,Mark T. Lemmon,J. Van Beek,Michael C. Malin,Danika Wellington,Kjartan M. Kinch,Morten Madsen,Craig Hardgrove,M. A. Ravine,E. Jensen,David E. Harker,Ryan B. Anderson,Kenneth E. Herkenhoff,R. V. Morris,E. Cisneros,Robert G. Deen +19 more
TL;DR: The NASA Curiosity rover Mast Camera (Mastcam) system is a pair of fixed-focal length, multispectral, color CCD imagers mounted approximately 2 m above the surface on the rover's remote sensing mast, along with associated electronics and an onboard calibration target as discussed by the authors.
Journal ArticleDOI
Grain properties of comet c/1995 o1 (hale-bopp)
David E. Harker,David E. Harker,David E. Harker,D. H. Wooden,D. H. Wooden,Charles E. Woodward,Charles E. Woodward,Carey M. Lisse +7 more
TL;DR: In this paper, the authors present the analysis of 7.6-13.2 μm infrared spectrophotometry (R 250) of comet C/1995 O1 (Hale-Bopp), in conjunction with concurrent observations that extend the wavelength coverage of the spectral energy distribution from near-to far-infrared wavelengths.
Grain Properties of Comet C/1995 O1 (Hale-Bopp) Deduced Through Computational Techniques
TL;DR: In this article, the authors present the computational analysis of the 7.6 - 13.2 micrometer infrared spectrophotometry (R approximately equal to 120) of comet C/1995 O1 (Hale-Bopp) in conjunction with concurrent observations which extend the spectral energy distribution from the near-infrared to farinfrared wavelengths.