| Origins for the near-Earth asteroids. | |
| | |
MedLine Citation:
|
PMID: 17736464 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Because of their short dynamical lifetimes, the population of near-Earth asteroids (NEAs) must be resupplied. Two sources have been hypothesized: main-belt asteroids and extinct comet nuclei. The difficulty of making physical measurements for similar sized (diameter D less than 5 kilometers) main-belt asteroids and comet nuclei has limited comparative tests for distinguishing between these alternatives. A new survey of physical properties for D < 5 kilometers main-belt asteroids reveals that their spin rate and shape distributions are similar to those of NEAs, as is fully consistent with a main-belt origin for most NEAs. Physical data on comet nuclei are limited. If the existing sample is representative of the comet population, analysis of the asteroid and comet samples constrains the fraction of comet nuclei to between 0 and 40 percent of the total NEA population. |
| | |
Authors:
|
R P Binzel; S Xu; S J Bus; E Bowell |
Related Documents
:
|
12288334 - Estimating and projecting the populations of urban communities. 7156934 - Occupational mortality studies. principles of validity. 20497324 - Bayesian analysis of molecular variance in pyrosequences quantifies population genetic ... 16232644 - Isoprenoid quinones as biomarkers of microbial populations in the environment. 3594844 - Using the coefficient of correlation in method-comparison studies. 18226794 - Stevens' power law and the problem of meaningfulness. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Science (New York, N.Y.) Volume: 257 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1992 Aug |
Date Detail:
|
Created Date: 2010-06-08 Completed Date: 2010-07-02 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
|
Languages: eng Pagination: 779-82 Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Evidence for Retrograde Lithospheric Subduction on Venus.
Next Document: Increasing Rates of Atmospheric Mercury Deposition in Midcontinental North America.