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New modeling of nuclear device to deflect or destroy asteroids en route to Earth（图）
小行星 核装置 天体物理学
2024/2/1
The same high energy density that makes nuclear energy a clean and efficient source of power could make it a good alternative to defend the planet against catastrophic asteroid impacts. NASA demonstra...
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 ...
Effects of orbital ellipticity on collisional disruptions of rubble-pile asteroids
Celestial mechanics Methods:numerical Minor planets,asteroids:general Planets and satellites:physical evolution
2015/12/25
The behavior of debris ejected from asteroids after collisional disruptions has significant implications for asteroid evolution. Analytical approximations of the elliptic restricted three-body system ...
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...
BVRI photometry of 53 unusual asteroids
Techniques photometric – Minor planets asteroids general
2010/11/9
We present the results of BV RI photometry and classification of 53 un-usual asteroids, including 35 near-Earth asteroids (NEAs), 6 high eccentric-ity/inclination asteroids, and 12 recently-identified...
Binary YORP and Evolution of Binary Asteroids
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/31
The rotation states of kilometer sized near earth asteroids are known to be affected by the YORP effect.
THE PROXIMITIES OF ASTEROIDS AND CRITICAL POINTS OF THE DISTANCE FUNCTION
Celestial mechanics Minor planets asteroids
2010/10/29
The proximities are important for di®erent purposes, for example to evaluate the risk of collisions of asteroids or comets with the Solar-System planets. We describe a simple and e±cient method fo...