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  Physical parameters of selected Gaia mass asteroids

Podlewska-Gaca, E., Marciniak, A., Ali-Lagoa, V., Bartczak, P., Müller, T. G., Szakáts, R., et al. (2020). Physical parameters of selected Gaia mass asteroids. Astronomy and Astrophysics, 638: A11. doi:10.1051/0004-6361/201936380.

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Podlewska-Gaca, E., Author
Marciniak, A., Author
Ali-Lagoa, V.1, Author              
Bartczak, P., Author
Müller, T. G.1, Author              
Szakáts, R., Author
Duffard, R., Author
Molnár, L., Author
Pál, A., Author
Butkiewicz-Bąk, M., Author
Dudziński, G., Author
Dziadura, K., Author
Antonini, P., Author
Asenjo, V., Author
Audejean, M., Author
Benkhaldoun, Z., Author
Behrend, R., Author
Bernasconi, L., Author
Bosch, J. M., Author
Chapman, A., Author
Dintinjana, B., AuthorFarkas, A., AuthorFerrais, M., AuthorGeier, S., AuthorGrice, J., AuthorHirsh, R., AuthorJacquinot, H., AuthorJehin, E., AuthorJones, A., AuthorMolina, D., AuthorMorales, N., AuthorParley, N., AuthorPoncy, R., AuthorRoy, R., AuthorSantana-Ros, T., AuthorSeli, B., AuthorSobkowiak, K., AuthorVerebélyi, E., AuthorŻukowski, K., Author more..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Context. Thanks to the Gaia mission, it will be possible to determine the masses of approximately hundreds of large main belt asteroids with very good precision. We currently have diameter estimates for all of them that can be used to compute their volume and hence their density. However, some of those diameters are still based on simple thermal models, which can occasionally lead to volume uncertainties as high as 20–30%. Aims. The aim of this paper is to determine the 3D shape models and compute the volumes for 13 main belt asteroids that were selected from those targets for which Gaia will provide the mass with an accuracy of better than 10%. Methods. We used the genetic Shaping Asteroids with Genetic Evolution (SAGE) algorithm to fit disk-integrated, dense photometric lightcurves and obtain detailed asteroid shape models. These models were scaled by fitting them to available stellar occultation and/or thermal infrared observations. Results. We determine the spin and shape models for 13 main belt asteroids using the SAGE algorithm. Occultation fitting enables us to confirm main shape features and the spin state, while thermophysical modeling leads to more precise diameters as well as estimates of thermal inertia values. Conclusions. We calculated the volume of our sample of main-belt asteroids for which the Gaia satellite will provide precise mass determinations. From our volumes, it will then be possible to more accurately compute the bulk density, which is a fundamental physical property needed to understand the formation and evolution processes of small Solar System bodies.

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Language(s): eng - English
 Dates: 2020-06-03
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/201936380
Other: LOCALID: 3250748
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 638 Sequence Number: A11 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1