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  Global spectrophotometric properties of Asteroid (21) Lutetia using Rosetta-OSIRIS images

Masoumzadeh, N., & Böhnhardt, H. (2019). Global spectrophotometric properties of Asteroid (21) Lutetia using Rosetta-OSIRIS images. Icarus, 326, 1-9. doi:10.1016/j.icarus.2019.02.005.

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 Creators:
Masoumzadeh, Nafiseh1, Author              
Böhnhardt, Hermann2, Author              
Affiliations:
1IMPRS on Physical Processes in the Solar System and Beyond, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832290              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Spectrophotometry Asteroids Asteroid Lutetia Planetary surfaces
 Abstract: We present a spectrophotometric analysis of the surface areas of asteroid (21) Lutetia that were imaged during the Rosetta flyby on July 2010 by the OSIRIS camera in the wavelength range 269 to 989 nm. A spectral slope change with respect to phase angle is found and interpreted as being due to areal diversity of Lutetia's surface. We applied Minnaert and Hapke models to disk-integrated and disk-resolved data of Lutetia. Except for the albedo in both models, the Minnaert (limb darkening k) and Hapke (roughness) parameter display no dependence on wavelength. The single scattering albedo, ω, shows a relative flat spectrum across the wavelength range with a slope of (1.65±0.29)% per 100 nm. The Hapke roughness parameter of Lutetia is constrained to be 28°± 1° in average for all wavelengths. We generated three different color ratio maps to investigate the overall color variation across the surface of Lutetia. Apart from differences on local scale no significant color variations are found across the regions imaged on Lutetia's surface (Achaia, Noricum, Narbonensis, Baetica and Etruria). Based on (931.9-nm/269.3-nm) color ratio map, the typical color contrast is estimated to be on the order of 10%. We note that, compared to other asteroids visited by spacecraft, the subtle color variation in order of 10% or less is observed for E-type asteroid (2867) Steins and the C-type asteroid (253) Mathilde.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.icarus.2019.02.005
 Degree: -

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Title: Icarus
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 326 Sequence Number: - Start / End Page: 1 - 9 Identifier: ISSN: 0019-1035
CoNE: https://pure.mpg.de/cone/journals/resource/954922645023