Results 161 to 170 of about 1,064 (199)

Detection of ice and organics on an asteroidal surface

Nature, 2010
Recent observations, including the discovery in typical asteroidal orbits of objects with cometary characteristics (main-belt comets, or MBCs), have blurred the line between comets and asteroids, although so far neither ice nor organic material has been detected on the surface of an asteroid or directly proven to be an asteroidal constituent.
Andrew S, Rivkin, Joshua P, Emery
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SinGAN-Based Asteroid Surface Image Generation

Journal of Database Management, 2021
While it is risky considering spacecraft constraints and unknown environment on asteroid, surface sampling is an important technique for asteroid exploration. One of the sample return missions is to seek an optimal landing site, which may be in hazardous terrain.
Yundong Guo, Jeng-Shyang Pan 0001, Chengbo Qiu, Fang Xie, Hao Luo 0001, Huiqiang Shang, Zhenyu Liu 0005, Jianrong Tan   +7 more
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Contact Motion on Surface of Asteroid

Journal of Spacecraft and Rockets, 2014
A comprehensive method for modeling the motion of a spherical pod at the surface of an asteroid is presented. Using triangular faceted surfaces, the largest features of the asteroid (global shape, monoliths, and large boulders) are modeled. The presence of smaller rocks is accounted for using a stochastic model of rock generation and collision.
Simon Tardivel, Daniel J. Scheeres, Patrick Michel, Stefaan Van wal, Paul Sánchez   +4 more
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An Asteroid Lander/Rover for Asteroid Surface Gravity Surveying

2016
Microsat and nanosat developers have mastered the challenges involved in developing low-cost, high-performance satellite missions in low Earth orbit. Here we describe a proposed small-microsat-scale (~20 kg) planetary exploration mission based on the same design approach used in those LEO missions.
Carroll, Kieran A., Spencer, Henry, Zee, Robert E.   +2 more
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The surface properties of asteroids

Advances in Space Research, 2004
Abstract The physical characteristics of asteroid surfaces are best defined by direct measurements, few of which currently exist. Thus, inferences from indirect observations must be made. From the limited visible and radar imagery heavy cratering marks the asteroid surfaces and the surfaces are rough at all scales.
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The Impact Record on Asteroid Surfaces

2001
The surfaces of main-belt and near-Earth asteroids have been carved over the age of the solar system by violent collisions with other asteroids. The craters and related features left behind can be used to interpret each asteroid's unique impact history, which depends on several factors: (i) the dynamical and physical properties of the asteroid (e.g ...
W. F. Bottke, R. Greenberg
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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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Near-Earth Asteroids: Surface Structure and Shapes

Earth, Moon, and Planets, 1996
The available data characterizing surface properties of near-Earth objects have been analyzed and compared with the data of large main belt asteroids. There are no evidences of the existence of solid rock surfaces among near-Earth objects.
I. N. Belskaya, D. F. Lupishko, A. N. Dovgopol   +2 more
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Surface Properties of Asteroids

1982
From spectrophotometry, polarimetry, IR-radiometry and UBV-photometry surface properties of asteroids are derived, such as:diameters, spectral reflectivity, albedo; based on observable parameters a classification into taxonomic types (Bowell et al.1978) is made and an interpretation in terms of the mineralogy of the surface and meteoritic analogs can ...
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Asteroids: Surface Composition from Reflection Spectroscopy

Science, 1974
Minerals partly composing the surfaces of 14 asteroids are determined by using asteroid reflectance spectra and optical properties of meteorites and other materials. Individual electronic absorption features are identified in the asteroids' spectra. The energies, relative strengths, and shapes of these features are interpreted by using laboratory and ...
T B, McCord, M J, Gaffey
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