A study of Hilda asteroids. III. Collision velocities and collision frequencies of Hilda asteroids

Details A study of Hilda asteroids. III. Collision velocities and collision frequencies of Hilda asteroids A study of Hilda asteroids. III. Collision velocities and collision frequencies of Hilda asteroids

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336.1056d&link_type=abstract

Astronomy and Astrophysics, v.336, p.1056-1064 (1998)

Astronomy and Astrophysics

Astrophysics

9

Asteroids

Scientific paper

The collision velocities and collision frequencies of Hilda asteroids have been investigated numerically. The collision probabilities and collision velocities have been determined from a data base of close encounters, obtained by numerical integrations of the orbits of 909 asteroids for 55 000 years. The integration included all known main-belt, Cybele, Hilda, and Trojan objects larger than 50 km in diameter. The mean collision probability is lower for Hilda asteroids than for main-belt, Cybele and Trojan asteroids. Out of ten collisions involving a Hilda object, about seven are with main-belt objects, and the other three collisions are evenly distributed among the three outer-belt groups. The collision probabilities of individual Hilda asteroids have a strong correlation with the eccentricity of their orbits, resulting in a wide range (about a factor of six) of collision probabilities among the Hilda objects. The mean collision velocity of the Hilda asteroids is 4.6 km s(-1) \:, which is 0.5 km s(-1) \: lower than the average for main-belt objects. The mean collision velocity of individual Hilda objects range from 3.3 to 6.0 km s(-1) \:.

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