Radiometric Calibration Targets for the Mastcam-Z Camera on the Mars 2020 Rover Mission
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Radiometric Calibration Targets for the Mastcam-Z Camera on the Mars 2020 Rover Mission K.M. Kinch1 · M.B. Madsen1 · J.F. Bell III2 · J.N. Maki3 · Z.J. Bailey3 · A.G. Hayes4 · O.B. Jensen1 · M. Merusi1 · M.H. Bernt1 · A.N. Sørensen1 · M. Hilverda5 · E. Cloutis6 · D. Applin6 · E. Mateo-Marti7 · J.A. Manrique8 · G. Lopez-Reyes8 · A. Bello-Arufe9 · B.L. Ehlmann3,10 · J. Buz11 · A. Pommerol12 · N. Thomas12 · L. Affolter12 · K.E. Herkenhoff13 · J.R. Johnson14 · M. Rice15 · P. Corlies4 · C. Tate4 · M.A. Caplinger16 · E. Jensen16 · T. Kubacki16 · E. Cisneros2 · K. Paris2 · A. Winhold2 Received: 18 May 2020 / Accepted: 17 November 2020 © The Author(s) 2020
Abstract The Mastcam-Z Camera is a stereoscopic, multispectral camera with zoom capability on NASA’s Mars-2020 Perseverance rover. The Mastcam-Z relies on a set of two deck-mounted radiometric calibration targets to validate camera performance and to provide an instantaneous estimate of local irradiance and allow conversion of image data to units of reflectance (R∗ or I/F) on a tactical timescale. Here, we describe the heritage, design, and The Mars 2020 Mission Edited by Kenneth A. Farley, Kenneth H. Williford and Kathryn M. Stack
B K.M. Kinch
[email protected]
1
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
2
School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
3
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
4
Department of Astronomy, Cornell University, Ithaca, NY, USA
5
The Planetary Society, Pasadena, CA, USA
6
Department of Geography, University of Winnipeg, Winnipeg, Manitoba, Canada
7
Centro de Astrobiología (CSIC-INTA), Torrejón de Ardoz, Madrid, Spain
8
University of Valladolid, Valladolid, Spain
9
National Space Institute, Technical University of Denmark, Lyngby, Denmark
10
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
11
Department of Astronomy and Planetary Science, Northern Arizona University, Flagstaff, AZ, USA
12
Space and Planetary Science Department, Physikalisches Institut, University of Bern, Bern, Switzerland
13
Astrogeology Science Center, United States Geological Survey, Flagstaff, AZ, USA
14
Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
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optical characterization of these targets and discuss their use during rover operations. The Mastcam-Z primary calibration target inherits features of camera calibration targets on the Mars Exploration Rovers, Phoenix and Mars Science Laboratory missions. This target will be regularly imaged during flight to accompany multispectral observations of the martian surface. The primary target consists of a gold-plated aluminum base, eight strong hollowcylinder Sm2 Co17 alloy permanent magnets mounted in the base, eight ceramic color and grayscale patches mounted over the magnets, four concentric, ceramic grayscale rings and a central aluminum shadow post (gnomon) painted with an IR-black paint.
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