A bolometric Bond albedo map of Iapetus: Observations from Cassini VIMS and ISS and Voyager ISS |
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| Authors: | David G Blackburn Bonnie J Buratti Richard Ulrich |
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| Institution: | 1. Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, 50411 Tartu, Estonia;2. Department of Geological Sciences, Stockholm University, Svante Arrhenius vägen 8c, 106 91 Stockholm, Sweden;1. Jet Propulsion Laboratory, California Institute of Technology, USA;2. 2012 Summer Undergraduate Research Fellow, Jet Propulsion Laboratory, California Institute of Technology, USA;3. Department of Physics, University of Notre Dame, USA |
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| Abstract: | We utilized Cassini VIMS, Cassini ISS, and Voyager ISS observations of Iapetus to produce the first bolometric Bond albedo map of Iapetus. The average albedo values for the leading and trailing hemispheres are 0.06 ± 0.01 and 0.25 ± 0.03, respectively. However, the bright material in high-resolution ISS images has a value of 0.38 ± 0.04, highlighting the importance of resolution in determining accurate albedo values for Iapetus due to the speckling of localized regions of dark material into the trailing hemisphere. The practical application of this map is determining more accurate surface temperatures in thermal models; these albedo values translate into first order blackbody temperatures of 125.5 K and 118.4 K for the trailing and leading hemispheres at the semi-major axis. |
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