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Mercury's spectrophotometric properties: Update from the Mercury Dual Imaging System observations during the third MESSENGER flyby |
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| Authors: | Deborah L Domingue Scott L Murchie Nancy L Chabot Brett W Denevi Faith Vilas |
| 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;dMMT Observatory, P.O. Box 210065, University of Arizona, Tucson, AZ 85721, USA |
| Abstract: | Presented here are analyses of the photometric measurements acquired by the imaging system on the MESSENGER spacecraft during its three flybys of Mercury, in particular the dedicated sequence of photometric measurements obtained during the third flyby. A concise, analytical approach is adopted for characterizing the effects of scattered light on the images. This approach works well for wavelengths shorter than 700 nm but breaks down at the longer wavelengths where the scattering behavior of the imaging system is more complex. Broadband spectral properties are commensurate with ground-based observations for spectra acquired at phase angles less than 110°; photometric corrections to a common illumination and viewing geometry provide consistent results for those phase angles. No phase reddening is apparent in the image-derived spectra. A bolometric albedo of 0.081 is derived over the wavelength range of the imaging system. |
| Keywords: | Photometry Mercury Spectral reflectance MESSENGER |
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