Photometric correction of Mercury's global color mosaic |
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| Authors: | Deborah L Domingue Scott L Murchie Brett W Denevi Nancy L Chabot David T Blewett Nori R Laslo Robin M Vaughan Hong K Kang Michael K Shepard |
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| Institution: | aPlanetary Science Institute, 1700 E. Fort Lowell, Suite 106, Tucson, AZ 85719-2395, USA;bJohns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;cSchool of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287-1404, USA;dDepartment of Geography and Geosciences, Bloomsburg University, 400 E. Second Street, Bloomsburg, PA 17815, USA |
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| Abstract: | During the third flyby of Mercury by the MESSENGER spacecraft, a dedicated disk-integrated photometric sequence was acquired with the wide-angle multispectral camera to observe Mercury's global photometric behavior in 11 spectral filters over as broad a range of phase angle as possible within the geometric constraints of the flyby. Extraction of disk-integrated measurements from images acquired during this sequence required careful accounting for scattered light and residual background effects. The photometric model fit to these measurements is shown to fit observed radiances at phase angles below 110°, possibly except where both solar incidence and emission angles are high (>70°). The complexity of the scattered light at wavelengths greater than 828 nm contributes to a less accurate photometric correction at these wavelengths. The model is used to correct the global imaging data set acquired at a variety of geometries to a common geometry of incidence angle=30°, emission angle=0°, and phase angle=30°, yielding a relatively seamless mosaic. The results here will be used to correct image mosaics of Mercury acquired in orbit. |
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| Keywords: | Photometry Mercury Spectra MESSENGER |
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