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Infrared (0.83–5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer

Buratti, B.J. and Soderlund, K. and Bauer, A. and Mosher, J.A. and Hicks, M.D. and Simonelli, D.P. and Jaumann, R. and Clark, R.N. and Brown, R.H. and Cruikshank, D.P. and Momary, T. (2008) Infrared (0.83–5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer. Icarus: International Journal of Solar System Studies, 193 (2), pp. 309-322. Elsevier. DOI: 10.1016/j.icarus.2007.09.014

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Abstract

Three weeks prior to the commencement of Cassini's 4 year tour of the saturnian system, the spacecraft executed a close flyby of the outer satellite Phoebe. The infrared channel of the Visual Infrared Mapping Spectrometer (VIMS) obtained images of reflected light over the 0.83–5.1 μm spectral range with an average spectral resolution of 16.5 nm, spatial resolution up to 2 km, and over a range of solar phase angles not observed before. These images have been analyzed to derive fundamental photometric parameters including the phase curve and phase integral, spectral geometric albedo, bolometric Bond albedo, and the single scattering albedo. Physical properties of the surface, including macroscopic roughness and the single particle phase function, have also been characterized. Maps of normal reflectance show the existence of two major albedo regimes in the infrared, with gradations between the two regimes and much terrain with substantially higher albedos. The phase integral of Phoebe is 0.29±0.03, with no significant wavelength dependence. The bolometric Bond albedo is 0.023±007. We find that the surface of Phoebe is rough, with a mean slope angle of 33°. The satellite's surface has a substantial forward scattering component, suggesting that its surface is dusty, perhaps from a history of outgassing. The spectrum of Phoebe is best matched by a composition including water ice, amorphous carbon, iron-bearing minerals, carbon dioxide, and Triton tholin. The characteristics of Phoebe suggest that it originated outside the saturnian system, perhaps in the Kuiper Belt, and was captured on its journey inward, as suggested by Johnson and Lunine (2005).

Item URL in elib:https://elib.dlr.de/61559/
Document Type:Article
Title:Infrared (0.83–5.1 μm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Buratti, B.J.Jet Propulsion Laboratory, Mail Stop 183-501, Pasadena, CA 91109, USA UNSPECIFIED
Soderlund, K.University of California, Department of Earth and Space Sci., Los Angeles, CA 90095, USAUNSPECIFIED
Bauer, A.Jet Propulsion Laboratory, Mail Stop 183-501, Pasadena, CA 91109, USA UNSPECIFIED
Mosher, J.A.Jet Propulsion Laboratory, Mail Stop 183-501, Pasadena, CA 91109, USA UNSPECIFIED
Hicks, M.D.Jet Propulsion Laboratory, Mail Stop 183-501, Pasadena, CA 91109, USA UNSPECIFIED
Simonelli, D.P.UNSPECIFIEDUNSPECIFIED
Jaumann, R.UNSPECIFIEDUNSPECIFIED
Clark, R.N.USGS, Denver Federal Center, Colorado, USAUNSPECIFIED
Brown, R.H.University of Arizona, Department of Planet. Sci. and LPL, Tucson, AZ 85721-0092, USAUNSPECIFIED
Cruikshank, D.P.NASA/Ames Research Center, Mail Stop 245-6, Moffett Field, CA 94035-1000, USAUNSPECIFIED
Momary, T.Jet Propulsion Laboratory, Mail Stop 183-501, Pasadena, CA 91109, USA UNSPECIFIED
Date:2008
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:193
DOI :10.1016/j.icarus.2007.09.014
Page Range:pp. 309-322
Publisher:Elsevier
Status:Published
Keywords:Saturn, satellites; Photometry; Infrared observations; Satellites, surfaces
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:09 Dec 2009 11:23
Last Modified:09 Dec 2009 11:23

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