000004928 001__ 4928
000004928 005__ 20200616043624.0
000004928 0247_ $$2DOI$$aDOI: 10.1016/j.icarus.2019.113425
000004928 037__ $$aSCART-2020-0125
000004928 100__ $$aSorsa, Liisa-Ida
000004928 245__ $$aTomographic inversion of gravity gradient field for a synthetic Itokawa model
000004928 260__ $$c2020
000004928 520__ $$aThis article investigates reconstructing the internal mass density of a numerical asteroid model using the gradient of a simulated gravity field as synthetic measurement data. Our goal is to advance the mathematical inversion methodology and find feasibility constraints for the resolution, noise and orbit selection for future space missions. We base our model on the shape of the asteroid Itokawa as well as on the recent observations and simulation studies which suggest that the internal density varies, increasing towards the center, and that the asteroid may have a detailed structure. We introduce randomized multiresolution scan algorithm which might provide a robust way to cancel out bias and artifact effects related to the measurement noise and numerical discretization. In this scheme, the inverse algorithm can reconstruct details of various sizes without fixing the exact resolution a priori, and the randomization minimizes the effect of discretization on the solution. We show that the adopted methodology provides an advantageous way to diminish the surface bias of the inverse solution. The results also suggest that a noise level below 80 Eotvos will be sufficient for the detection of internal voids and high density anomalies, if a sparse set of measurements can be obtained from a close-enough distance to the target.
000004928 594__ $$aNO
000004928 700__ $$aTakala, Mika
000004928 700__ $$aBambach, Patrick
000004928 700__ $$aDeller, Jakob
000004928 700__ $$aVilenius, Esa
000004928 700__ $$aAgarwal, Jessica
000004928 700__ $$aCarroll, Kieran A.
000004928 700__ $$aKaratekin, Ozgur
000004928 700__ $$aPursiainen, Sampsa
000004928 773__ $$pIcarus$$v336$$y2020
000004928 8560_ $$fozgur.karatekin@observatoire.be
000004928 8564_ $$s5551461$$uhttp://publi2-as.oma.be/record/4928/files/sorsa2019.pdf
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000004928 905__ $$apublished in
000004928 980__ $$aREFERD