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The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa
During the interval from September through early December 2005, the Hayabusa spacecraft was in close proximity to near-Earth asteroid 25143 Itokawa, and a variety of data were taken on its shape,…
Asteroid Density, Porosity, and Structure
New data from observations of asteroid mutural perturbation events, observations of asteroid satellites, and spacecraft encounters have revolutionized our understanding of asteroid bulk density.
Quantifying the Risk Posed by Potential Earth Impacts
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.
Determination of Shape, Gravity, and Rotational State of Asteroid 433 Eros
Abstract Prior to the Near Earth Asteroid Rendezvous (NEAR) mission, little was known about Eros except for its orbit, spin rate, and pole orientation, which could be determined from ground-based…
JPL's On-Line Solar System Data Service
Activity of comets at large heliocentric distances pre-perihelion
Mainbelt Asteroids: Results of Arecibo and Goldstone Radar Observations of 37 Objects during 1980-1995
Abstract We report detailed results of Arecibo and Goldstone radar observations of 30 mainbelt asteroids (MBAs) during 1980–1995. In addition to estimates of radar cross section, radar albedo, and…
Orbital motion, nucleus precession, and splitting of periodic Comet Brooks 2
Results of ten nongravitational orbital solutions are given for Comet Brooks 2, based on observations from the apparitions 1889-1980. The time history of the nongravitational parameters, including…
Imaging of Small-Scale Features on 433 Eros from NEAR: Evidence for a Complex Regolith
The subdued appearance of craters of different diameters and the variety of blocks and different degrees of their burial suggest that ejecta from several impact events blanketed the region imaged at closest approach and led to the building up of a substantial and complex regolith consisting of fine materials and abundant meter-sized blocks.
The long-term motion of comet Halley
The orbital motion of comet Halley is numerically integrated back to 1404 BC. Starting with an orbit based on the 1759, 1682, and 1607 observations of the comet, the integration was run back in time…