NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The Probable Ages of Asteroid FamiliesThere has been considerable debate recently over the ages of the Hirayama families, and in particular if some of the families are very oung(u) It is a straightforward task to estimate the characteristic time of a collision between a body of a given diameter, d_o, by another body of diameter greater of equal to d_1. What is less straightforward is to estimate the critical diameter ratio, d_1/d_o, above which catastrophic disruption occurs, from which one could infer probable ages of the Hirayama families, by knowing the diameter of the parent body, d_o. One can gain some insight into the probable value of d_1/d_o, and of the likely ages of existing families, from the plot below. I have computed the characteristic time between collisions in the asteroid belt of a size ratio greater of equal to d_1/d_o, for 4 sizes of target asteroids, d_o. The solid curves to the lower right are the characteristic times for a single object...
Document ID
20060039318
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Harris, A. W.
Date Acquired
August 23, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Bulletin of the American Astronomical Society
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other