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Spectrophotometric properties of dwarf planet Ceres from VIR onboard Dawn mission

Ciarniello, M. and De Sanctis, M. C. and Ammannito, E. and Raponi, A. and Longobardo, A. and Palomba, E. and Carrozzo, F. G. and Tosi, F. and Li, J.-Y. and Schröder, Stefan and Zambon, F. and Frigeri, A. and Fonte, S. and Giardino, M. and Pieters, C. M. and Raymond, C. A. and Russell, C. T. (2017) Spectrophotometric properties of dwarf planet Ceres from VIR onboard Dawn mission. Astronomy & Astrophysics, 598, A130. EDP Sciences. DOI: 10.1051/0004-6361/201629490 ISSN 0004-6361

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Official URL: http://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/201629490

Abstract

Aims. We present a study of the spectrophotometric properties of dwarf planet Ceres in the visual-to-infrared (VIS-IR) spectral range by means of hyper-spectral images acquired by the VIR imaging spectrometer on board the NASA Dawn mission. Methods. Disk-resolved observations with a phase angle within the 7 ◦ < α < 132 ◦ interval were used to characterize Ceres’ phase curve in the 0.465-4.05 µm spectral range. Hapke’s model was applied to perform the photometric correction of the dataset to standard observation geometry at VIS-IR wavelength, allowing us to produce albedo and color maps of the surface. The V-band magnitude phase function of Ceres as been computed from disk-resolved images and fitted with both the classical linear model and H-G formalism. Results. The single- scattering albedo and the asymmetry parameter at 0.55 µm are w = 0.14±0.02 and ξ = −0.11±0.08, respectively (two-lobe Henyey-Greenstein phase function); at the same wavelength, Ceres’ geometric albedo as derived from our modeling is 0.094±0.007; the roughness parameter is ¯ θ = 29 ◦ ±6 ◦ . Albedo maps indicate small variability on a global scale with an average reflectance at standard geometry of 0.034 ± 0.003. Nonetheless, isolated areas such as the Occator bright spots, Haulani, and Oxo show an albedo much higher than average. We measure a significant spectral phase reddening, and the average spectral slope of Ceres’ surface after photometric correction is 1.1%kÅ −1 and 0.85%kÅ −1 at VIS and IR wavelengths, respectively. Broadband color indices are V−R = 0.38±0.01 and R−I = 0.33±0.02. Color maps show that the brightest features typically exhibit smaller slopes. The H-G modeling of the V-band magnitude phase curve for α < 30 ◦ gives H = 3.14±0.04 and G = 0.10±0.04, while the classical linear model provides V(1,1,0 ◦ ) = 3.48±0.03 and β = 0.036±0.002. The comparison of our results with spectrophotometric properties of other minor bodies indicates that Ceres has a less back-scattering phase function and a slightly higher albedo than comets and C-type objects. However, the latter represents the closest match in the usual asteroid taxonomy.

Item URL in elib:https://elib.dlr.de/110130/
Document Type:Article
Title:Spectrophotometric properties of dwarf planet Ceres from VIR onboard Dawn mission
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ciarniello, M.inaf–iaps, istituto di astrofisica e planetologia spaziali, area di ricerca di tor vergata, via del fosso del cavaliere, 100, 00133 rome, italyUNSPECIFIED
De Sanctis, M. C.inaf, iaps, rome, italyUNSPECIFIED
Ammannito, E.uclaUNSPECIFIED
Raponi, A.inaf-iaps istituto di astrofisica e planetologia spaziali, rome, italyUNSPECIFIED
Longobardo, A.inaf-iaps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Palomba, E.inaf-iaps, rome, italyUNSPECIFIED
Carrozzo, F. G.inaf-iasf istituto di astrofisica spaziale e fisica cosmica, roma italyUNSPECIFIED
Tosi, F.inaf-iaps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Li, J.-Y.planetary science institute, 1700 east fort lowell, tucson, az 85719-2395, usaUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Zambon, F.inaf-iaps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Frigeri, A.inaf-iaps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Fonte, S.inaf/instituto di fisica dello spazio interplanetarario, rome, italyUNSPECIFIED
Giardino, M.istituto di astrofisica e planetologia spaziali, istituto nazionale di astrofisica,via del fosso del cavaliere, 00133 roma, italyUNSPECIFIED
Pieters, C. M.brown universityUNSPECIFIED
Raymond, C. A.carol.a.raymond (at) jpl.nasa.govUNSPECIFIED
Russell, C. T.ctrussel (at) igpp.ucla.eduUNSPECIFIED
Date:February 2017
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:598
DOI :10.1051/0004-6361/201629490
Page Range:A130
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:minor planets, asteroids: Ceres – methods: data analysis – techniques: photometric – techniques: spectro- scopic – techniques: imaging spectroscopy – planets and satellites: surfaces
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Schröder, Dr. Stefan
Deposited On:03 Jan 2017 15:46
Last Modified:08 Mar 2018 18:23

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