منابع مشابه
The peculiar case of the Agnia asteroid family
The Agnia asteroid family, a cluster of asteroids located near semimajor axis a = 2.79 AU, has experienced significant dynamical evolution over its lifetime. The family, which was likely created by the breakup of a diameter D ∼ 50 km parent body, is almost entirely contained within the high-order secular resonance z1. This means that unlike other families, Agnia’s full extent in proper eccentri...
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Asteroid (1726) Hoomeister is the lowest{ numbered and probably the largest member of a small, very compact dynamical family. Up to now, the only physical information available on this family consisted of the comparatively low IRAS albedos of Hoomeister and two other family members. After discussing the properties of the family, we report on our own observations of the optical reeectance spectr...
متن کاملAR-AR AGES OF EUCRITES AND THE THERMAl HISTORY OF ASTEROID 4-VESTA
New Ar-Ar ages of several cumulate and unbrecciated eucrites cluster at ~4.48 Gyr. We suggest that this age cluster was produced by interruption of eucrite metamorphism within the Vesta parent asteroid by a giant impact, which excavated and rapidly cooled these meteorites. We see no evidence for younger formation ages of the cumulate eucrites, as previously proposed. Introduction. Several obser...
متن کاملStability of family interaction from ages 6 to 18.
Research has demonstrated the stability of juvenile offending during childhood and adolescence but generally has not focused on the continuity of family interactions associated with juvenile offending. The present report focused on the stability of several family interaction events and attributes (i.e., physical punishment, communication, supervision, positive parenting, and parent-child relati...
متن کاملWork, Health, and Family at Older Ages in Japan.
In this paper, we investigate ways in which the relationship between health and labor force exit at older ages is moderated by family characteristics. Using two waves of data from a national sample of older Japanese men collected 1999 and 2002, we estimate logistic regression models for labor force exit beyond age 63 as a function of health change, family characteristics, and their interactions...
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ژورنال
عنوان ژورنال: Icarus
سال: 2015
ISSN: 0019-1035
DOI: 10.1016/j.icarus.2015.04.041