منابع مشابه
ar X iv : a st ro - p h / 98 12 23 5 v 1 1 1 D ec 1 99 8 1620 Geographos and 433 Eros : Shaped by Planetary Tides ?
Until recently, most asteroids were thought to be solid bodies whose shapes were determined largely by collisions with other asteroids (Davis et al., 1989). It now seems that many asteroids are little more than rubble piles, held together by self-gravity (Burns 1998); this means that their shapes may be strongly distorted by tides during close encounters with planets. Here we report on numerica...
متن کاملInvited Review The geology of 433 Eros
1Center for Planetary Sciences, Northwestern University, 1850 Campus Drive, Evanston, Illinois 60208, USA 2Center for Radiophysics and Space Research, Cornell University, Ithaca, New York 14850, USA 3Department of Astronomy, Cornell University, Ithaca, New York 14850, USA 4The John Hopkins University Applied Physics Laboratory, 11100 John Hopkins Road, Laurel, Maryland 20723, USA 5Hawaii Instit...
متن کاملSpectral properties and rotational spectral heterogeneity of 433 Eros
Composite spectra of different rotational aspects of the S asteroid 433 Eros were assembled from previous studies, covering the wavelength range 0ø33-2.5 grn. These data allow us to measure significant attributes of Eros's spectrum• its mafic mineral absorptions, and the degree and nature of compositional heterogeneity of its surfaceo We also evaluated previous Sasteroid taxonomies using indepe...
متن کاملThe spin state of 433 Eros and its possible implications
In this paper, we show that Asteroid (433) Eros is currently residing in a spin–orbit resonance, with its spin axis undergoing a smallamplitude libration about the Cassini state 2 of the proper mode in the nonsingular orbital element sin I/2 exp(ıΩ), where I the orbital inclination and Ω the longitude of the node. The period of this libration is 53.4 kyr. By excluding these libration wiggles, w...
متن کاملPhysical characterisation of near-Earth asteroid (1620) Geographos: reconciling radar and thermal-infrared observations
Context. The Yarkovsky (orbital drift) and YORP (spin state change) effects play important roles in the dynamical and physical evolution of asteroids. Thermophysical modelling of these observed effects, and of thermal-infrared observations, allows a detailed physical characterisation of an individual asteroid to be performed. Aims. We perform a detailed physical characterisation of near-Earth a...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1999
ISSN: 0004-6256
DOI: 10.1086/300811