Results 201 to 210 of about 15,938 (229)

Surface Gravity Fields for Asteroids and Comets

Journal of Guidance, Control, and Dynamics, 2013
The characteristics of the interior gravity field are derived, summarized, and evaluated near the surface of an asteroid for the purpose of small body proximity operations. In order to characterize the gravity field of a body, the exterior gravity field is widely in use.
Yu Takahashi, D. J. Scheeres, Robert A. Werner   +2 more
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The Surface Environment on Asteroids

2012
The goal of many space missions to small bodies, such as the Hayabusa mission to Itokawa and the forthcoming OSIRIS-REx mission to asteroid 1999 RQ36, are to take samples from the surface of the body. The prospect of designing a transfer to an asteroid surface and choosing where on the surface to sample begs several questions related to the flow of ...
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Consequences of surface variegation of asteroids

Planetary and Space Science, 1994
Abstract Different surface layers on opposite sides of asteroids produce colour and albedo variations. Similarly a single-period variation with amplitude 0.013 mag deg−1 in the phase factor has recently been detected during the rotation of (51) Nemausa. Phase factor variation seems to be a general property of asteroids and explains part of the linear
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Modeling of migrating grains on asteroid’s surface

Astrophysics and Space Science, 2014
We present a numerical method based on the polyhedral data of asteroid shape for simulation of individual grain’s dynamics around the asteroid surface, with application to migration of regolith material on specific asteroid. Surface gravitational attraction and potential are computed using polyhedral method with a correction on possible singularities ...
Yang Yu, Hexi Baoyin
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Asteroid Surface Weathering Optimization

Asteroid surface weathering is an important research topic in astrophysics. Its mechanisms include complex interactions from multiple sources, including micrometeorite impacts, solar wind bombardment, and nano-iron accumulation. Inspired by this natural phenomenon, this paper proposes a novel heuristic optimization algorithm, the Asteroid Surface ...
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The surface of asteroid 951 Gaspra

Earth, Moon, and Planets, 1996
I present new maps, photomosaics and geological interpretations of asteroid 951 Gaspra. Facets and limb concavities suggest a long history of large impacts producing 5 to 7 km diameter craters. Craters 1 to 4 km in diameter date the last facet-forming impact, though it is not clear which facet this formed.
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Asteroid Surface Weathering Inspired Optimization

This paper proposes a heuristic optimization algorithm based on asteroid surface weathering processes, named ASWO-I (Asteroid Surface Weathering Inspired Optimization). The algorithm simulates the physical and chemical changes on an asteroid's surface caused by solar wind bombardment, micrometeorite impacts, and spectral degradation, mapping these ...
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Surface Lithologic Heterogeneity of Asteroid 4 Vesta

Icarus, 1997
Abstract High precision spectrophotometry of 4 Vesta, the third largest asteroid, was used to establish the surface composition of this body and to investigate mineralogical variations across its surface. The average surface of Vesta is analogous to howardite and/or polymict eucrite assemblages, regolith-derived members of the HED meteorite suite ...
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Successful kinetic impact into an asteroid for planetary defence

Nature, 2023
R Terik Daly, C M Ernst, Olivier Barnouin   +2 more
exaly  

Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu

Science, 2023
Hiroshi Naraoka, Yoshinori Takano, Jason Dworkin   +2 more
exaly