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  Tomographic inversion of gravity gradient field for a synthetic Itokawa model

Sorsa, L.-I., Takala, M., Bambach, P., Deller, J., Vilenius, E., Agarwal, J., et al. (2020). Tomographic inversion of gravity gradient field for a synthetic Itokawa model. Icarus, 336: 113425. doi:10.1016/j.icarus.2019.113425.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-DB2F-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-DB30-E
Genre: Journal Article

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 Creators:
Sorsa, Liisa-Ida, Author
Takala, Mika, Author
Bambach, Patrick1, Author              
Deller, Jakob1, Author              
Vilenius, Esa1, Author              
Agarwal, Jessica1, Author              
Carroll, Kieran A., Author
Karatekin, Özgür, Author
Pursiainena, Sampsa, Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: This article investigates reconstructing the internal mass density of a numerical asteroid model using the gradient of a simulated gravity field as synthetic measurement data. Our goal is to advance the mathematical inversion methodology and find feasibility constraints for the resolution, noise and orbit selection for future space missions. We base our model on the shape of the asteroid Itokawa as well as on the recent observations and simulation studies which suggest that the internal density varies, increasing towards the center, and that the asteroid may have a detailed structure. We introduce randomized multiresolution scan algorithm which might provide a robust way to cancel out bias and artifact effects related to the measurement noise and numerical discretization. In this scheme, the inverse algorithm can reconstruct details of various sizes without fixing the exact resolution a priori, and the randomization minimizes the effect of discretization on the solution. We show that the adopted methodology provides an advantageous way to diminish the surface bias of the inverse solution. The results also suggest that a noise level below 80 Eotvos will be sufficient for the detection of internal voids and high density anomalies, if a sparse set of measurements can be obtained from a close-enough distance to the target.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.icarus.2019.113425
 Degree: -

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Title: Icarus
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 336 Sequence Number: 113425 Start / End Page: - Identifier: ISSN: 0019-1035
CoNE: https://pure.mpg.de/cone/journals/resource/954922645023