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Observations on the magnitude-frequency distribution of Earth-crossing asteroidsDuring the past decade, discovery of Earth-crossing asteroids has continued at the pace of several per year; the total number of known Earth crossers reached 70 as of September, 1986. The sample of discovered Earth crossers has become large enough to provide a fairly strong statistical basis for calculations of mean probabilities of asteroid collision with the Earth, the Moon, and Venus. It is also now large enough to begin to address the more difficult question of the magnitude-frequency distribution and size distribution of the Earth-crossing asteroids. Absolute V magnitude, H, was derived from reported magnitudes for each Earth crosser on the basis of a standard algorithm that utilizes a physically realistic phase function. The derived values of H range from 12.88 for (1627) Ivar to 21.6 for the Palomar-Leiden object 6344, which is the faintest and smallest asteroid discovered.
Document ID
19870013936
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Shoemaker, Eugene M. (Geological Survey Flagstaff, AZ, United States)
Shoemaker, Carolyn S. (Arizona Research and Technology Flagstaff., United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1987
Publication Information
Publication: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986
Subject Category
Astrophysics
Accession Number
87N23369
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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