Dumb-bell-shaped equilibrium figures for fiducial contact-binary asteroids and EKBOs

被引：29
作者：
Descamps, Pascal [1 ]
机构：
[1] Inst Mecan Celeste & Calcul Ephemerides, Observ Paris, UMR CNRS 8028, F-75014 Paris, France
来源：
ICARUS | 2015年 / 245卷
关键词：
Asteroids; surfaces; Data reduction techniques; Photometry; Occultations; LIGHTCURVE INVERSION; OPTIMIZATION METHODS; DENSITY; SIMULATIONS; PHOTOMETRY; BODIES; MODEL;
D O I：
10.1016/j.icarus.2014.08.002
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this work, we investigate the equilibrium figures of a dumb-bell-shaped sequence with which we are still not well acquainted. Studies have shown that these elongated and nonconvex figures may realistically replace the classic "Roche binary approximation" for modeling putative peanut-shaped or contact binary asteroids. The best-fit dumb-bell shapes, combined with the known rotational period of the objects, provide estimates of the bulk density of these objects. This new class of mathematical figures has been successfully tested on the observed light curves of three noteworthy small bodies: main-belt Asteroid 216 Kleopatra, Trojan Asteroid 624 Hektor and Edgeworth-Kuiper-belt object 2001 QG(298). Using the direct observations of Kleopatra and Hektor obtained with high spatial resolution techniques and fitting the size of the dumb-bell-shaped solutions, we derived new physical characteristics in terms of equivalent radius, 62.5 +/- 5 km and 92 +/- 5 km, respectively, and bulk density, 4.4 +/- 0.4 g cm(-3) and 2.43 +/- 0.35 g cm(-3), respectively. In particular, the growing inadequacy of the radar shape model for interpreting any type of observations of Kleopatra (light curves, AO images, stellar occultations) in a satisfactory manner suggests that Kleopatra is more likely to be a dumb-bell-shaped object than a "dog-bone." (C) 2014 Elsevier Inc. All rights reserved.
引用
收藏
页码：64 / 79
页数：16
相关论文
共 51 条
[1]   Near-Earth Asteroid 2005 CR37: Radar images and photometry of a candidate contact binary [J].
Benner, Lance A. M. ;
Nolan, Michael C. ;
Ostro, Steven J. ;
Giorgini, Jon D. ;
Pray, Donald P. ;
Harris, Alan W. ;
Magri, Christopher ;
Margot, Jean-Luc .
ICARUS, 2006, 182 (02) :474-481
[2]   Shape modeling technique KOALA validated by ESA Rosetta at (21) Lutetia [J].
Carry, B. ;
Kaasalainen, M. ;
Merline, W. J. ;
Mueller, T. G. ;
Jorda, L. ;
Drummond, J. D. ;
Berthier, J. ;
O'Rourke, L. ;
Durech, J. ;
Kueppers, M. ;
Conrad, A. ;
Tamblyn, P. ;
Dumas, C. ;
Sierks, H. .
PLANETARY AND SPACE SCIENCE, 2012, 66 (01) :200-212
[3]   POST-NEWTONIAN EFFECTS OF GENERAL RELATIVITY ON EQUILIBRIUM OF UNIFORMLY ROTATING BODIES .3. DEFORMED FIGURES OF JACOBI ELLIPSOIDS [J].
CHANDRASEKHAR, S .
ASTROPHYSICAL JOURNAL, 1967, 148 (2P1) :621-+
[4]  
Comito C., 2011, MEM SOC ASTRON IT S, V16, P84
[5]  
Cook A., 1971, NASA Special Publication, V267, P155
[6]  
Darwin George H., 1887, PHIL T A, V178, P379
[7]   On the figure and stability of a liquid satellite. [J].
Darwin, GH .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER, 1906, 206 :161-248
[8]   New determination of the size and bulk density of the binary Asteroid 22 Kalliope from observations of mutual eclipses [J].
Descamps, P. ;
Marchis, F. ;
Pollock, J. ;
Berthier, J. ;
Vachier, F. ;
Birlan, M. ;
Kaasalainen, M. ;
Harris, A. W. ;
Wong, M. H. ;
Romanishin, W. J. ;
Cooper, E. M. ;
Kettner, K. A. ;
Wiggins, P. ;
Kryszczynska, A. ;
Polinska, A. ;
Coliac, J. -F ;
Devyatkin, A. ;
Verestchagina, I. ;
Gorshanov, D. .
ICARUS, 2008, 196 (02) :578-600
[9]   Angular momentum of binary asteroids: Implications for their possible origin [J].
Descamps, P. ;
Marchis, F. .
ICARUS, 2008, 193 (01) :74-84
[10]   Nature of the small main belt Asteroid 3169 Ostro [J].
Descamps, P. ;
Marchis, F. ;
Michalowski, T. ;
Colas, F. ;
Berthier, J. ;
Vachier, F. ;
Teng-Chuen-Yu, J. -P. ;
Peyrot, A. ;
Payet, B. ;
Dorseuil, J. ;
Leonie, Y. ;
Dijoux, T. ;
Berrouachdi, H. ;
Hock, C. Chion ;
Benard, F. .
ICARUS, 2007, 189 (02) :362-369
123456