Asteroid (16) Psyche’s primordial shape: A possible Jacobi ellipsoid
Asteroid (16) Psyche’s primordial shape: A possible Jacobi ellipsoid
复制标题
小行星 (16) Psyche 的原始形状：可能的雅可比椭球体
DOI：
10.1051/0004-6361/202038100
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发表时间：
2020
影响因子：
6.5
通讯作者：
Brož, M.
中科院分区：
文献类型：
--
作者：
Ferrais, M.;Vernazza, P.;Jorda, L.;Rambaux, N.;Hanuš, J.;Carry, B.;Marchis, F.;Marsset, M.;Viikinkoski, M.;Brož, M.
ContextAsteroid (16) Psyche is the largest M-type asteroid in the main belt and the target of the NASA Psyche mission. It is also the only asteroid of this size (D> 200 km) known to be metal rich. Although various hypotheses have been proposed to explain the rather unique physical properties of this asteroid, a perfect understanding of its formation and bulk composition is still missing.AimsWe aim to refine the shape and bulk density of (16) Psyche and to perform a thorough analysis of its shape to better constrain possible formation scenarios and the structure of its interior.MethodsWe obtained disk-resolved VLT/SPHERE/ZIMPOL images acquired within our ESO large program (ID 199.C-0074), which complement similar data obtained in 2018. Both data sets offer a complete coverage of Psyche’s surface. These images were used to reconstruct the three-dimensional (3D) shape of Psyche with two independent shape modeling algorithms (MPCD and ADAM). A shape analysis was subsequently performed, including a comparison with equilibrium figures and the identification of mass deficit regions.ResultsOur 3D shape along with existing mass estimates imply a density of 4.20 ± 0.60 g cm−3, which is so far the highest for a solar system object following the four telluric planets. Furthermore, the shape of Psyche presents small deviations from an ellipsoid, that is, prominently three large depressions along its equator. The flatness and density of Psyche are compatible with a formation at hydrostatic equilibrium as a Jacobi ellipsoid with a shorter rotation period of ∼3h. Later impacts may have slowed down Psyche’s rotation, which is currently ∼4.2 h, while also creating the imaged depressions.ConclusionsOur results open the possibility that Psyche acquired its primordial shape either after a giant impact while its interior was already frozen or while its interior was still molten owing to the decay of the short-lived radionuclide26Al.
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影响因子：
3.2
作者：
M. Shepard;J. Richardson;P. Taylor;L. A. Rodriguez-Ford;A. Conrad;I. Pater;M. Ádámkovics;K. Kleer;J. Males;K. Morzinski;L. Close;M. Kaasalainen;M. Viikinkoski;B. Timerson;V. Reddy;C. Magri;M. Nolan;E. Howell;L. Benner;J. Giorgini;B. Warner;A. Harris
通讯作者：
M. Shepard;J. Richardson;P. Taylor;L. A. Rodriguez-Ford;A. Conrad;I. Pater;M. Ádámkovics;K. Kleer;J. Males;K. Morzinski;L. Close;M. Kaasalainen;M. Viikinkoski;B. Timerson;V. Reddy;C. Magri;M. Nolan;E. Howell;L. Benner;J. Giorgini;B. Warner;A. Harris
CM类小行星的均质内部结构（41）Daphne
影响因子：
6.5
作者：
Carry, B.;Vachier, F.;Berthier, J.;Marsset, M.;Vernazza, P.;Grice, J.;Merline, W. J.;Lagadec, E.;Fienga, A.;Conrad, A.
通讯作者：
Conrad, A.
影响因子：
6.5
作者：
R. F'etick;L. Jorda;P. Vernazza;M. Marsset;A. Drouard;Thierry Fusco;B. Carry;F. Marchis;J. Hanuš;M. Viikinkoski;M. Birlan;P. Bartczak;J. Berthier;J. Castillo-Rogez;F. Cipriani;F. Colas;G. Dudziński;C. Dumas;M. Ferrais;E. Jehin;M. Kaasalainen;A. Kryszczyńska;P. Lamy;H. Coroller;A. Marciniak;T. Michałowski;P. Michel;L. Mugnier;B. Neichel;M. Pajuelo;E. Podlewska-Gaca;T. Santana-Ros;P. Tanga;F. Vachier;A. Vigan;O. Witasse;Bin Yang
通讯作者：
R. F'etick;L. Jorda;P. Vernazza;M. Marsset;A. Drouard;Thierry Fusco;B. Carry;F. Marchis;J. Hanuš;M. Viikinkoski;M. Birlan;P. Bartczak;J. Berthier;J. Castillo-Rogez;F. Cipriani;F. Colas;G. Dudziński;C. Dumas;M. Ferrais;E. Jehin;M. Kaasalainen;A. Kryszczyńska;P. Lamy;H. Coroller;A. Marciniak;T. Michałowski;P. Michel;L. Mugnier;B. Neichel;M. Pajuelo;E. Podlewska-Gaca;T. Santana-Ros;P. Tanga;F. Vachier;A. Vigan;O. Witasse;Bin Yang
大型分化小行星的破碎和再积聚形成中菱铁矿
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
E. Scott;H. Haack;S. Love
通讯作者：
S. Love
DOI：
10.1364/josaa.21.001841
发表时间：
2004-10
期刊：
Journal of the Optical Society of America. A, Optics, image science, and vision
影响因子：
--
作者：
L. Mugnier;T. Fusco;J. Conan
通讯作者：
L. Mugnier;T. Fusco;J. Conan