The small binary asteroid (939) Isberga

被引：11

作者：

Carry, B. ^{[1
,2
]}

Matter, A. ^{[3
,4
]}

Scheirich, P. ^{[5
]}

Pravec, P. ^{[5
]}

Molnar, L. ^{[6
]}

Mottola, S. ^{[7
]}

Carbognani, A. ^{[13
]}

Jehin, E. ^{[11
]}

Marciniak, A. ^{[12
]}

Binzel, R. P. ^{[9
]}

DeMeo, F. E. ^{[9
,10
]}

Birlan, M. ^{[1
]}

Delbo, M. ^{[8
]}

Barbotin, E.

Behrend, R. ^{[14
]}

Bonnardeau, M.

Colas, F. ^{[1
]}

Farissier, P. ^{[15
]}

Fauvaud, M. ^{[16
,17
]}

Fauvaud, S. ^{[16
,17
]}

Gillier, C. ^{[15
]}

Gillon, M. ^{[11
]}

Hellmich, S. ^{[7
]}

Hirsch, R. ^{[12
]}

Leroy, A.

Manfroid, J. ^{[11
]}

Montier, J.

Morelle, E.

Richard, F. ^{[17
]}

Sobkowiak, K. ^{[12
]}

Strajnic, J.

Vachier, F. ^{[1
]}

机构：

[1] Univ Lille 1, IMCCE, Observ Paris, Univ Paris 06,CNRS,UMR8028, F-75014 Paris, France

[2] ESA, European Space Astron Ctr, Madrid 28691, Spain

[3] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[4] Univ Grenoble 1, CNRS, INSU, IPAG,UMR 5274, F-38041 Grenoble, France

[5] Acad Sci Czech Republ, Astron Inst, CZ-25165 Ondrejov, Czech Republic

[6] Calvin Coll, Dept Phys & Astron, Grand Rapids, MI 49546 USA

[7] Deutsch Zentrum Luft & Raumfahrt DLR, D-12489 Berlin, Germany

[8] Observ Cote Azur, CNRS, UNS, Lab Lagrange, F-06304 Nice 04, France

[9] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[10] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[11] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[12] Adam Mickiewicz Univ, Astron Observ Inst, Fac Phys, PL-60286 Poznan, Poland

[13] Astron Observ Autonomous Reg Aosta Valley, I-11020 Nus, Aosta, Italy

[14] Observ Geneva, CH-1290 Sauverny, Switzerland

[15] CALA, F-69120 Vaulx En Velin, France

[16] Observ Bois Bardon, F-16110 Taponnat, France

[17] Assoc T60, F-31400 Toulouse, France

来源：

ICARUS | 2015年 / 248卷

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

Asteroids; dynamics; Satellites of asteroids; Orbit determination; MAIN-BELT ASTEROIDS; INTERFEROMETRIC OBSERVATIONS; IRRADIATION EXPERIMENTS; DENSITY; MIDI; SIMULATION; DISCOVERY; ITOKAWA; SURFACE; ORIGIN;

D O I：

10.1016/j.icarus.2014.11.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In understanding the composition and internal structure of asteroids, their density is perhaps the most diagnostic quantity. We aim here at characterizing 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 lbserga as a Sq-type asteroid, consistent with the albedo of 0.14(-006)(+009), (all uncertainties are reported as 3-sigma-range) we determine (average albedo of S-types is 0.197 +/- 0.153, see Pravec et al. (Pravec et al. [2012]. Icarus 221, 365-387). Lightcurve analysis reveals that the mutual orbit has a period of 26.6304 +/- 0.0001 h, is close to circular (eccentricity lower than 0.1), and has pole coordinates within 7 degrees of (225 degrees, +86 degrees) in Ecliptic J2000, implying a low obliquity of 1.5(-1.5)(+6.0) 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(-1.2)(+2.5) km and 3.6(-0.3)(+0.7) 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(-2.01)(+1.72) 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]. Planet. Space Sci. 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). (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：516 / 525

页数：10

共 56 条

[1] An introduction to visibility modeling [J].

Berger, Jean Philippe ;

Segransan, Damien .

NEW ASTRONOMY REVIEWS, 2007, 51 (8-9) :576-582

[2]

Binzel R. P., 2006, LPI, V37, P1491

[3] Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes [J].

Binzel, RP ;

Rivkin, AS ;

Stuart, JS ;

Harris, AW ;

Bus, SJ ;

Burbine, TH .

ICARUS, 2004, 170 (02) :259-294

[4] Testing space weathering models on A-type asteroid (1951) Lick [J].

Brunetto, R. ;

de Leon, J. ;

Licandro, J. .

ASTRONOMY & ASTROPHYSICS, 2007, 472 (02) :653-656

[5] Modeling asteroid surfaces from observations and irradiation experiments: The case of 832 Karin [J].

Brunetto, Rosario ;

Vernazza, Pierre ;

Marchi, Simone ;

Birlan, Mirel ;

Fulchignoni, Marcello ;

Orofino, Vincenzo ;

Strazzulla, Giovanni .

ICARUS, 2006, 184 (02) :327-337

[6] Small main-belt asteroid spectroscopic survey in the near-infrared [J].

Burbine, TH ;

Binzel, RP .

ICARUS, 2002, 159 (02) :468-499

[7] Density of asteroids [J].

Carry, B. .

PLANETARY AND SPACE SCIENCE, 2012, 73 (01) :98-118

[8] Integral-field spectroscopy of (90482) Orcus-Vanth [J].

Carry, B. ;

Hestroffer, D. ;

DeMeo, F. E. ;

Thirouin, A. ;

Berthier, J. ;

Lacerda, P. ;

Sicardy, B. ;

Doressoundiram, A. ;

Dumas, C. ;

Farrelly, D. ;

Mueller, T. G. .

ASTRONOMY & ASTROPHYSICS, 2011, 534

[9] The remarkable surface homogeneity of the Dawn mission target (1) Ceres [J].

Carry, Benoit ;

Vernazza, Pierre ;

Dumas, Christophe ;

Merline, William J. ;

Mousis, Olivier ;

Rousselot, Philippe ;

Jehin, Emmanuel ;

Manfroid, Jean ;

Fulchignoni, Marcello ;

Zucconi, Jean-Marc .

ICARUS, 2012, 217 (01) :20-26

[10] Space weathering of asteroid surfaces [J].

Chapman, CR .

ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, 2004, 32 :539-567

← 1 2 3 4 5 6 →