minor planets; asteroids: general; techniques: photometric; radiation mechanisms: thermal; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] 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%. <BR /> 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%. <BR /> 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. <BR /> 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. <BR /> 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Podlewska-Gaca, E.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Marciniak, A.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Bartczak, P.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Müller, T. G.; Max-Planck-Institut für extraterrestrische Physik (MPE), Giessenbachstrasse 1, 85748, Garching, Germany
Szakáts, R.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary
Duffard, R.; Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, 18008, Granada, Spain
Molnár, L.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary ; MTA CSFK Lendület Near-Field Cosmology Research Group, Budapest, Hungary
Pál, A.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary ; Astronomy Department, Eötvös Loránd University, Pázmány P. s. 1/A, H-1171, Budapest, Hungary
Butkiewicz-Bąk, M.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Dudziński, G.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Dziadura, K.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Antonini, P.; Observatoire des Hauts Patys, 84410, Bedoin, France
Asenjo, V.; Asociación Astronómica Astro Henares, Centro de Recursos Asociativos El Cerro C/ Manuel Azaña, 28823, Coslada, Spain
Audejean, M.; B92 Observatoire de Chinon, Chinon, France
Benkhaldoun, Z.; Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco
Bernasconi, L.; Observatoire des Engarouines, 1606 chemin de Rigoy, 84570, Malemort-du-Comtat, France
Bosch, J. M.; B74, Avinguda de Catalunya 34, 25354, Santa Maria de Montmagastrell (Tàrrega), Spain
Chapman, A.; I39, Cruz del Sur Observatory, San Justo city, Buenos Aires, Argentina
Dintinjana, B.; University of Ljubljana, Faculty of Mathematics and Physics Astronomical Observatory, Jadranska 19, 1000, Ljubljana, Slovenia
Farkas, A.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary
Ferrais, Marin ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Geier, S.; Instituto de Astrofísica de Canarias, C/ Vía Lactea s/n, 38205, La Laguna, Tenerife, Spain ; Gran Telescopio Canarias (GRANTECAN), Cuesta de San José s/n, 38712, Breña Baja, La Palma, Spain
Grice, J.; School of Physical Sciences, The Open University, MK7 6AA, UK
Hirsh, R.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Jacquinot, H.; Observatoire des Terres Blanches, 04110, Reillanne, France
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jones, A.; I64, SL6 1XE, Maidenhead, UK
Molina, D.; Anunaki Observatory, Calle de los Llanos, 28410, Manzanares el Real, Spain
Morales, N.; Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, 18008, Granada, Spain
Parley, N.; The IEA, University of Reading, Philip Lyle Building, Whiteknights Campus, Reading, RG6 6BX, UK
Poncy, R.; Rue des Ecoles 2, 34920, Le Cres, France
Roy, R.; Observatoire de Blauvac, 293 chemin de St Guillaume, 84570, Blauvac, France
Santana-Ros, T.; Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, 03080, Alicante, Spain ; Institut de Ciéncies del Cosmos, Universitat de Barcelona (IEEC-UB), Martí i Franqués 1, 08028, Barcelona, Spain
Seli, B.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary
Sobkowiak, K.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland
Verebélyi, E.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Konkoly Thege Miklós, út 15-17, Hungary
Żukowski, K.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, Poznań, Poland)
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