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Photometry of Ceres and Occator faculae as inferred from VIR/Dawn data

Longobardo, A and Palomba, E. and Galiano, Anna and De Sanctis, M.C. and Ciarniello, M. and Raponi, A. and Tosi, F. and Schröder, Stefan and Carrozzo, F. G. and Ammannito, E. and Zambon, F. and Stephan, Katrin and Capria, M. T. and Rognini, E. and Raymond, C.A. and Russell, C.T. (2019) Photometry of Ceres and Occator faculae as inferred from VIR/Dawn data. Icarus, 320, pp. 97-109. Elsevier. doi: 10.1016/j.icarus.2018.02.022. ISSN 0019-1035.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103517306115


Spectral parameters of Ceres measured by the Dawn/VIR imaging spectrometer are studied as a function of illumination angles, by applying a semi-empirical method based on a statistical analysis of the VIR dataset acquired up to September 2016. The study also focuses on the photometry of the Occator faculae, i.e. the brightest spots of the Ceres surface, showing an albedo up to eight times the Ceres average. The considered semi-empirical approach takes into account the small extension (and hence small dataset) of this region and lays the groundwork to apply scattering models even on such a limited area. The behavior of Ceres visible and infrared reflectance with phase angle is similar to other asteroids belonging to its same spectral class, i.e. C-type. The depth of the bands at 2.7 μm (phyllosilicates), 3.1 μm (ammonium), 3.4 μm (magnesium carbonates) and the infrared spectral slope linearly increase with phase angle, showing analogies with other asteroids and occurrence of phase reddening. The different behavior of the 3.9 μm band depth (also due to Mg carbonates), independent of illumination angles, could indicate that other carriers contribute to the 3.4 μm band and play a more important role in photometry outside the carbonate deposits. The phase function of the Occator faculae is much steeper than expected from its high albedo. Mixture of bright and dark material and larger roughness can be at the basis of this result. The phyllosilicate bands show a steeper increase with phase angle with respect to the Ceres average, due to the lower presence of dark materials, and/or again larger roughness. The absence of trends with phase angles of the two carbonate bands and of the spectral slope suggests that carbonates do not produce phase reddening.

Item URL in elib:https://elib.dlr.de/122354/
Document Type:Article
Title:Photometry of Ceres and Occator faculae as inferred from VIR/Dawn data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIEDUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Galiano, AnnaIAPS - Istituto di Astrofisica e Planetologia Spaziali, INAF - Istituto Nazionale di Astrofisica, Rome, ItalyUNSPECIFIEDUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
Schröder, StefanUNSPECIFIEDhttps://orcid.org/0000-0003-0323-8324UNSPECIFIED
Carrozzo, F. G.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
Ammannito, E.ASI-URS, via del Politecnico snc, Rome I-00133, ItalyUNSPECIFIEDUNSPECIFIED
Zambon, F.INAF-IAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIEDUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIEDUNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIEDUNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 97-109
Keywords:Asteroid Ceres Asteroids Photometry Spectroscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project DAWN (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Schröder, Dr. Stefan
Deposited On:13 Dec 2018 08:13
Last Modified:05 Dec 2019 14:40

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