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The small binary asteroid (939) Isberga

Carry, B. and Matter, A. and Scheirich, P. and Pravec, P. and Molnar, L. and Mottola, S. and Carbognani, A. and Jehin, E. and Marciniak, A. and Binzel, R.P. and DeMeo, F.E. and Birlan, M. and Delbo, M. and Barbotin, E. and Behrend, R. and Bonnardeau, M. and Colas, F. and Farissier, P. and Fauvaud, M. and Fauvaud, S. and Gillier, C. and Gillon, M. and Hellmich, S. and Hirsch, R. and Leroy, A. and Manfroid, J. and Montier, J. and Morelle, E. and Richard, F. and Sobkowiak, K. and Strajnic, J. and Vachier, F. (2015) The small binary asteroid (939) Isberga. Icarus, 248, pp. 516-525. Elsevier. DOI: 10.1016/j.icarus.2014.11.002 ISSN 0019-1035

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.icarus.2014.11.002

Abstract

In understanding the composition and internal structure of asteroids, their density is perhaps the most diagnostic quantity. We aim here to characterize the surface composition, mutual orbit, size, mass, and density of the small main-belt binary asteroid (939) Isberga. For that, we conduct a suite of multi-technique observations, including optical lightcurves over many epochs, near-infrared spectroscopy, and interferometry in the thermal infrared. We develop a simple geometric model of binary systems to analyze the interferometric data in combination with the results of the lightcurve modeling. From spectroscopy, we classify Ibserga as a Sq-type asteroid, consistent with the albedo of 0.14 (+0.09/-0.06) (all uncertainties are reported as 3-\sigma range) we determine (average albedo of S-types is 0.197 \pm 0.153, Pravec et al., 2012, Icarus 221, 365-387). Lightcurve analysis reveals that the mutual orbit has a period of 26.6304 \pm 0.0001 h, is close to circular, and has pole coordinates within 7 deg. of (225, +86) in ECJ2000, implying a low obliquity of 1.5 deg. The combined analysis of lightcurves and interferometric data allows us to determine the dimension of the system and we find volume-equivalent diameters of 12.4^{+2.5}_{-1.2} km and 3.6^{+0.7}_{-0.3} km for Isberga and its satellite, circling each other on a 33 km wide orbit. Their density is assumed equal and found to be 2.91^{+1.72}_{-2.01} g.cm^{-3}, lower than that of the associated ordinary chondrite meteorites, suggesting the presence of some macroporosity, but typical of S-types of the same size range (Carry, 2012, P\&SS 73, 98-118). The present study is the first direct measurement of the size of a small main-belt binary. Although the interferometric observations of Isberga are at the edge of MIDI capabilities, the method described here is applicable to others suites of instruments (e.g, LBT, ALMA).

Item URL in elib:https://elib.dlr.de/97162/
Document Type:Article
Title:The small binary asteroid (939) Isberga
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Carry, B.IMCCE, Observatoire de Paris, UPMC Paris-06, Université Lille1, UMR8028 CNRS, 77 Av. Denfert Rochereau, 75014 Paris, France, bcarry (at) imcce.frUNSPECIFIED
Matter, A.Max Planck institut für Radioastronomie, Auf dem Hügel, 69, 53121 Bonn, GermanyUNSPECIFIED
Scheirich, P.Astronomical Institute, Academy of Sciences of the Czech Republic, Fricova 298, CZ-25165 Ondrejov, Czech RepublicUNSPECIFIED
Pravec, P.Astronomical Institute, Academy of Sciences of the Czech Republic, Fricova 298, CZ-25165 Ondrejov, Czech RepublicUNSPECIFIED
Molnar, L.Department of Physics and Astronomy, Calvin College, 3201 Burton SE, Grand Rapids, MI 49546, USAUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Carbognani, A.Astronomical Observatory of the Autonomous Region of the Aosta Valley, Loc. Lignan 39, 11020 Nus (Aosta), ItalyUNSPECIFIED
Jehin, E.Institut d'Astrophysique et de Géophysique, Universitée de Liège, Allée du 6 août 17, B-4000 Liège, BelgiumUNSPECIFIED
Marciniak, A.Astronomical Observatory Institute, Faculty of Physics, A. Mickiewicz University, Słoneczna 36, 60-286 Poznan, PolandUNSPECIFIED
Binzel, R.P.Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USAUNSPECIFIED
DeMeo, F.E.Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USAUNSPECIFIED
Birlan, M.IMCCE, Observatoire de Paris, UPMC Paris-06, Université Lille1, UMR8028 CNRS, 77 Av. Denfert Rochereau, 75014 Paris, FranceUNSPECIFIED
Delbo, M.UNS-CNRS-Observatoire de la Côte dAzur, Laboratoire Lagrange, BP 4229 06304 Nice Cedex 04, FranceUNSPECIFIED
Barbotin, E.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Behrend, R.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Bonnardeau, M.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Colas, F.IMCCE, Observatoire de Paris, UPMC Paris-06, Université Lille1, UMR8028 CNRS, 77 Av. Denfert Rochereau, 75014 Paris, FranceUNSPECIFIED
Farissier, P.Club d’Astronomie de Lyon Ampère (CALA), Place de la Nation, 69120 Vaulx-en-Velin, FranceUNSPECIFIED
Fauvaud, M.Observatoire du Bois de Bardon, 16110 Taponnat, FranceUNSPECIFIED
Fauvaud, S.Observatoire du Bois de Bardon, 16110 Taponnat, FranceUNSPECIFIED
Gillier, C.Club d’Astronomie de Lyon Ampère (CALA), Place de la Nation, 69120 Vaulx-en-Velin, FranceUNSPECIFIED
Gillon, M.Institut d'Astrophysique et de Géophysique, Universitée de Liège, Allée du 6 août 17, B-4000 Liège, BelgiumUNSPECIFIED
Hellmich, S.stephan.hellmich (at) dlr.deUNSPECIFIED
Hirsch, R.Astronomical Observatory Institute, Faculty of Physics, A. Mickiewicz University, Słoneczna 36, 60-286 Poznan, PolandUNSPECIFIED
Leroy, A.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Manfroid, J.Institut d'Astrophysique et de Géophysique, Universitée de Liège, Allée du 6 août 17, B-4000 Liège, BelgiumUNSPECIFIED
Montier, J.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Morelle, E.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Richard, F.Association T60, 14 Avenue Edouard Belin, 31400 Toulouse, FranceUNSPECIFIED
Sobkowiak, K.Astronomical Observatory Institute, Faculty of Physics, A. Mickiewicz University, Słoneczna 36, 60-286 Poznan, PolandUNSPECIFIED
Strajnic, J.CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, SwitzerlandUNSPECIFIED
Vachier, F.IMCCE, Observatoire de Paris, UPMC Paris-06, Université Lille1, UMR8028 CNRS, 77 Av. Denfert Rochereau, 75014 Paris, FranceUNSPECIFIED
Date:1 March 2015
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:248
DOI :10.1016/j.icarus.2014.11.002
Page Range:pp. 516-525
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Asteroids, dynamics, Satellites of asteroids, Orbit determination
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Bründl, Tara-Marie
Deposited On:04 Sep 2015 08:35
Last Modified:06 Sep 2019 15:26

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