minor planets; asteroids: individual: (704) Interamnia; methods: observational; techniques: high angular resolution; techniques: photometric; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] Context. With an estimated diameter in the 320-350 km range, (704) Interamnia is the fifth largest main belt asteroid and one of the few bodies that fills the gap in size between the four largest bodies with D > 400 km (Ceres, Vesta, Pallas and Hygiea) and the numerous smaller bodies with diameter ≤200 km. However, despite its large size, little is known about the shape and spin state of Interamnia and, therefore, about its bulk composition and past collisional evolution. <BR /> Aims: We aimed to test at what size and mass the shape of a small body departs from a nearly ellipsoidal equilibrium shape (as observed in the case of the four largest asteroids) to an irregular shape as routinely observed in the case of smaller (D ≤ 200 km) bodies. <BR /> Methods: We observed Interamnia as part of our ESO VLT/SPHERE large program (ID: 199.C-0074) at thirteen different epochs. In addition, several new optical lightcurves were recorded. These data, along with stellar occultation data from the literature, were fed to the All-Data Asteroid Modeling algorithm to reconstruct the 3D-shape model of Interamnia and to determine its spin state. <BR /> Results: Interamnia's volume-equivalent diameter of 332 ± 6 km implies a bulk density of ρ = 1.98 ± 0.68 g cm[SUP]-3[/SUP], which suggests that Interamnia - like Ceres and Hygiea - contains a high fraction of water ice, consistent with the paucity of apparent craters. Our observations reveal a shape that can be well approximated by an ellipsoid, and that is compatible with a fluid hydrostatic equilibrium at the 2σ level. <BR /> Conclusions: The rather regular shape of Interamnia implies that the size and mass limit, under which the shapes of minor bodies with a high amount of water ice in the subsurface become irregular, has to be searched among smaller (D ≤ 300 km) less massive (m ≤ 3 × 10[SUP]19[/SUP] kg) bodies. <P />The reduced images are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/cat/J/A+A/633/A65">http://cdsarc.u-strasbg.fr/viz- bin/cat/J/A+A/633/A65</A> <P />Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under program 199.C-0074 (PI: Vernazza).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hanuš, Josef; Institute of Astronomy, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague, Czech Republic
Vernazza, Pierre; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Viikinkoski, Matti; Mathematics and Statistics, Tampere University, 33720, Tampere, Finland
Ferrais, Marin ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Rambaux, N.; IMCCE, Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014, Paris Cedex, France
Podlewska-Gaca, Edyta; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Drouard, Alexis; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Jorda, Laurent; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Carry, Benoît; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France
Marsset, Michaël; Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
Marchis, Franck; SETI Institute, Carl Sagan Center, 189 Bernado Avenue, Mountain View, CA, 94043, USA
Warner, B.; Center for Solar System Studies, 446 Sycamore Ave., Eaton, CO, 80615, USA
Asenjo, V.; Asociación Astronómica Astro Henares, Centro de Recursos Asociativos El Cerro C/ Manuel Azaña, 28823, Coslada, Madrid, Spain
Berger, N.; 490 chemin du Gonnet, 38440, Saint Jean de Bournay, France
Bronikowska, M.; Institute of Geology, A. Mickiewicz University, Krygowskiego 12, 61-606, Poznań, Poland
Brothers, T.; Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
Charbonnel, S.; Observatoire de Durtal, 49430, Durtal, France
Colazo, C.; Observatorio Astronómico de Córdoba, Córdoba, Argentina
Coliac, J.-F.; 20 parc des Pervenches, 13012, Marseille, France
Duffard, R.; Instituto de Astrofisica de Andalucia - CSIC. Glorieta de la Astronomía s/n, 18008, Granada, Spain
Jones, A.; I64, SL6 1XE, Maidenhead, UK
Leroy, A.; Uranoscope, Avenue Carnot 7, 77220, Gretz-Armainvilliers, France
Marciniak, A.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Melia, R.; Observatorio Astronómico de Córdoba, Córdoba, Argentina
Molina, D.; Anunaki Observatory, Calle de los Llanos, 28410, Manzanares el Real, Spain
Nadolny, J.; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain
Person, M.; Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
Pejcha, O.; Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague, Czech Republic
Riemis, H.; Courbes de rotation d'astéroïdes et de comètes, CdR, Geneva Observatory, 1290, Sauverny, Switzerland
Shappee, B.; Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA
Sobkowiak, K.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Soldán, F.; Observatorio Amanecer de Arrakis, Alcalá de Guadaíra, Sevilla, Spain
Suys, D.; Courbes de rotation d'astéroïdes et de comètes, CdR, Geneva Observatory, 1290, Sauverny, Switzerland
Szakats, R.; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly Thege 15-17, 1121, Budapest, Hungary
Vantomme, J.; Courbes de rotation d'astéroïdes et de comètes, CdR, Geneva Observatory, 1290, Sauverny, Switzerland
Birlan, M.; IMCCE, Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014, Paris Cedex, France
Berthier, J.; IMCCE, Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014, Paris Cedex, France
Bartczak, P.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Dumas, C.; Thirty-Meter-Telescope, 100 West Walnut St, Suite 300, Pasadena, CA, 91124, USA
Dudziński, G.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Ďurech, J.; Institute of Astronomy, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000, Prague, Czech Republic
Castillo-Rogez, J.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
Cipriani, F.; European Space Agency, ESTEC - Scientific Support Office, Keplerlaan 1, Noordwijk, 2200 AG, The Netherlands
Fetick, R.; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Fusco, T.; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Grice, J.; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France ; Open University, School of Physical Sciences, The Open University, MK7 6AA, UK
Kaasalainen, M.; Mathematics and Statistics, Tampere University, 33720, Tampere, Finland
Kryszczynska, A.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Lamy, P.; Laboratoire Atmosphères, Milieux et Observations Spatiales, CNRS & UVSQY, Guyancourt, France
Michalowski, T.; Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286, Poznań, Poland
Michel, Patrick; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France
Santana-Ros, T.; Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, 03080, Alicante, Spain ; Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí i Franquès 1, 08028, Barcelona, Spain
Tanga, P.; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France
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Vigan, A.; Aix Marseille Univ, CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Witasse, O.; European Space Agency, ESTEC - Scientific Support Office, Keplerlaan 1, Noordwijk, 2200 AG, The Netherlands
Yang, B.; European Southern Observatory (ESO), Alonso de Cordova 3107, 1900, Casilla Vitacura, Santiago, Chile)
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