搜索结果: 1-11 共查到“太阳与太阳系 Asteroids”相关记录11条 . 查询时间(0.078 秒)
COUPLED SPIN AND SHAPE EVOLUTION OF SMALL RUBBLE-PILE ASTEROIDS:SELF-LIMITATION OF THE YORP EFFECT
methods numerical–minor planets,asteroids general
2015/12/25
We present the first self-consistent simulations of the coupled spin-shape evolution of small gravitational aggregates under the influence of the YORP effect. Because of YORP's sensitivity to surface ...
The Brazil nut effect and its application to asteroids
methods:numerical comets:general minor planets,asteroids:general
2015/12/25
Out of the handful of asteroids that have been imaged, some have distributions of blocks that are not easily explained. In this paper, we investigate the possibility that seismic shaking leads to the ...
Spin-up of rubble-pile asteroids:Disruption,satellite formation,and equilibrium shapes
Asteroid, Dynamics Rotational dynamics Satellites,Dynamics
2015/12/25
We present results from numerical experiments testing the behavior of cohesionless gravitational aggregates experiencing a gradual increase of angular momentum. The test bodies used in these numerical...
Asteroids are leftover pieces from the era of planet formation that help us understand conditions in the early Solar System. Unlike larger planetary bodies that were subject to global thermalmodificat...
Asteroids:equilibrium shapes of rotating gravitational aggregates
Asteroids shapes–Numerical simulations–Solar System evolution
2015/12/25
Many evidences lead us to think that a significant portion of asteroids are aggregates of boulders kept together by gravity, with little or no contribution from cohesive forces. The standard hydrodyna...
Numerical simulations of asteroids modelled as gravitational aggregates with cohesion
Asteroid structure Asteroid dynamics Asteroid satellites Collisional physics Impact processes
2015/12/25
Evidence is mounting that asteroids larger than a few hundred metres in diameter are gravitational aggregates of smaller, cohesive pieces. For example, images of 25143 Itokawa show aboulder-strewn sur...
Catastrophic disruption of asteroids and family formation:a review of numerical simulations including both fragmentation and gravitational reaccumulations
Asteroids composition Asteroids dynamics Collisional physics Impact processes
2015/12/25
In the last few years, thanks to the development of sophisticated numerical codes, a major breakthrough has been achieved in our understanding of the processes involved in small bodycollisions. In thi...
AVAST Survey 0.4-1.0 μm Spectroscopy of Igneous Asteroids in the Inner and Middle Main Belt
ASTEROIDS ASTEROIDS COMPOSITION SPECTROSCOPY
2012/2/21
We present the spectra of 60 asteroids, including 47 V-types observed during the first phase of the Adler V-Type Asteroid (AVAST) Survey. SDSS photometry was used to select candidate V-type asteroids ...
Nonextensive distributions of rotation periods and diameters of asteroids
asteroids – rotation periods – diameters – nonextensivity
2011/10/21
Context. To investigate the distribution of periods of rotation of asteroids of different regions of the Solar System and distribution of diameters of near-Earth asteroids (NEAs). Aims. Verify if none...
Mining the CFHT Legacy Survey for known Near Earth Asteroids
asteroids ephemerides methods:data analysis astronomical databases:miscellaneous
2011/10/8
The Canada-France-Hawaii Legacy Survey (CFHTLS) comprising about 25 000 MegaCam images was data mined to search for serendipitous encounters of known Near Earth Asteroids (NEAs) and Potentially Hazard...
NASA Study Shows Asteroids May Have Accelerated Life on Earth
NASA Asteroids Accelerated Life Earth
2009/5/21
The study focused on a particularly cataclysmic occurrence known as the Late Heavy Bombardment, or LHB. This event occurred approximately 3.9 billion years ago and lasted 20 to 200 million years. In a...