Showing papers in "Icarus in 2002"

TL;DR: The second phase of the Small Main Belt Asteroid Spectroscopic Survey (SMASSII) produced an internally consistent set of visible-wavelength charge-coupled device (CCD) spectra for 1447 asteroids.

TL;DR: In this article, a best-fit model of the near-Earth objects (NEOs) population is presented, which is fit to known NEs discovered or accidentally rediscovered by Spacewatch.

TL;DR: In this article, a model for light scattering from particulate media is modified to include several improvements: (1) a better approximation to the Ambartsumian-Chandrasekhar H-functions that is especially important for particles with single scattering albedos close to 1.00, increased accuracy for anisotropically scattering particles, and incorporation of coherent backscattering.

TL;DR: The chemical species containing carbon, nitrogen, and oxygen in the atmospheres of giant planets, brown dwarfs (T and L dwarfs), and low-mass stars (M dwarfs) are identified as part of a comprehensive set of thermochemical equilibrium and kinetic calculations for all elements as discussed by the authors.

TL;DR: The second phase of the Small Main-belt Asteroid Spectroscopic Survey (SMASSII) as discussed by the authors provides a new basis for studying the compositional structure of the asteroid belt.

TL;DR: In this article, the authors used the data acquired by the Galileo magnetometer on five passes by Ganymede to characterize the internal magnetic moments through quadrupole order and found that the data were consistent with an inductive response of a good electrical conductor of radius approximately 1.5 km. Although the data do not enable them to establish the presence of an induction response beyond doubt, their favored model gave a good fit to the data using only 4 parameters to describe the internal sources of fields, whereas the equally good dipole plus quadrupoles fit requires 8 parameters.

TL;DR: In this paper, the authors examined outcomes of such evolution in systems of three Jupiter-mass planets around a solar-mass star by integration of their orbits in three dimensions, and found that the most common outcome of gravitational scattering by close encounters is hyperbolic ejection of one planet.

TL;DR: In this article, a simple model of local heat transport on Mars demonstrates that transient melting of ice may occur in depressions and gullies nearly anywhere on the planet where thin ice is illuminated by normal-incidence insolation.

TL;DR: In this article, the authors used the laser rangefinder (NLR) data to determine a 24th degree and order shape model of Eros and used it to estimate the spherical harmonic gravity field of the asteroid.

TL;DR: The geomorphology and topography of the Cerberus Plains region of Mars show three spatially and temporally distinct, young, aqueous flood channel systems as discussed by the authors, and the discharges for two of the three systems (Athabasca Valles and Marte Vallis) have been estimated from surface topography to have been on the order of 10 6 m 3 /s.

TL;DR: In this article, data from the recent gravity measurements by the Galileo mission are used to construct a wide range of interior structure and composition models for the Galilean satellites of Jupiter, showing that mantle densities of Io and Europa are consistent with an olivine-dominated mineralogy with the ratios of Mg to Fe components depending on mantle temperature for Io and on ice shell thickness.

TL;DR: In this article, the total mass of the asteroid belt is estimated from an analysis of the motions of the major planets by processing high precision measurements of ranging to the landers Viking-1, Viking-2, and Pathfinder (1976-1997).

TL;DR: In this paper, the authors carried out simultaneous photometric and polarimetric measurements of laboratory samples that simulate the structure of planetary regoliths Computer modeling of shadow-hiding and coherent backscatter in regolith-like media are also presented.

TL;DR: In this article, the authors use hydrocode modeling to investigate dynamic models for the collapse of the Chicxulub impact crater, where strong vibrations produced by the expanding shock wave cause extreme pressure fluctuations in the target.

TL;DR: In this paper, the authors analyzed the dynamical evolution of JF comets and near-Earth asteroids with aphelion distances Q > 3.5 AU, paying special attention to the problem of mixing of both populations, such that inactive comets may be disguised as NEAs.

TL;DR: In this article, high-resolution spectra of HC3N and CH3CN were collected at 39-kHz resolution using a frequency-switched technique and several CH3N features were recorded at 78kHz resolution in two transitions around 147.6 and 220.7 GHz.

TL;DR: A new hazard scale that will describe the risk posed by a particular potential impact in both absolute and relative terms is proposed and described, which reflects the urgency of the situation in a natural way and thus can guide specialists in assessing the computational and observational effort appropriate for a given situation.

TL;DR: In this article, the authors studied the YORP effect on the rotation of small asteroids and found that the most typical feature of this end state of the rotation evolution is a deceleration of rotation rate, which means that at some instant collisions will randomize the rotation state.

TL;DR: The transneptunian object (TNO) 2000 CR 105 has a semimajor axis of 220±1 AU and perihelion distance of 44.14±0.02 AU, beyond the domain associated with the Kuiper Belt objects interacting via gravitational encounters with Neptune as discussed by the authors.

TL;DR: In this paper, the effect of eccentricity damping caused by gravitational interaction with disk gas as a drag force (gravitational drag) was investigated for the last stage of terrestrial planet formation.

TL;DR: In this article, the authors derived semi-analytic formulas for the stirring and dynamical friction rates based on their numerical results, and confirm that they reproduce the results of N -body simulations with sufficient accuracy.

TL;DR: Athabasca and Marte Valles lie on the Cerberus plains, between the young, lava-covered plains of Elysium Planitia and Amazonis Planitia.

TL;DR: In this article, the shape of Eros was measured using a multispectral imaging (MIMO) system and the authors provided a survey of the major topographic features and slope processes on this asteroid.

TL;DR: In this article, the authors used a viscoelastic Maxwell rheology for the ice, the viscosity of which has been varied over a wide range, and is found to strongly increase if an (inviscid) internal ocean is present.

TL;DR: In this paper, the shapes and rotational states of selected asteroids based on data from the Uppsala Asteroid Photometric Catalogue are estimated. But the results show a wide variety of shapes especially among the smaller asteroids.

TL;DR: In this article, the authors focus on the dynamical dispersion of the proper eccentricity and inclination of the asteroids, which occurs due to chaotic diffusion in narrow mean motion resonances, the Yarkovsky nongravitational force, and the gravitational impulses received at close approaches with large asteroids.

TL;DR: In this article, a simple diffusion model was proposed to estimate the CO production rate in the upper atmosphere of Jupiter, assuming an eddy diffusion coefficient around the tropopause between 300 and 1500 cm2 s−1.

TL;DR: In this article, the authors report 14 new absorption bands, which they tentatively assign to specific vibrational transitions, which are attributed to CH3D and CH4D, respectively.

TL;DR: The initiation and evolution of a planet-encircling dust storm on Mars have been observed in unprecedented detail by the Thermal Emission Spectrometer (TES) on board the Mars Global Surveyor.

TL;DR: In this article, the authors measured the rate of sulfate anion production for cyclo-octal sulfur grains in frozen water at temperatures, energies, and dose rates appropriate for Europa using energetic electrons.