Hilda Asteroids

Mats Dahlgren, Claes-Ingvar Lagerkvist, Felix Lahulla (Observatorio Astronomico, Madrid), Iwan Williams, Mitch Gordon (Queen Mary and Westfield College, London) and Alan Fitzsimmons (Queen's University, Belfast) have completed a project aiming at a better knowledge and understanding of the physical parameters, (rotation, shape and surface composition), of the Hilda asteroids. This is complemented with dynamical studies of the Hilda population.


CCD photometry was obtained of 47 Hilda asteroids. Interesting "high lights" are the very large light curve amplitude of 2483 Guinevere and the very fast rotation of 3415 Danby.


High S/N CCD reflectance spectra have been obtained for a large part of the numbered population. The results have been published in two papers.

Orbital Evolution:

Orbital evolution studies of the Hilda asteroids by numerical integration in a Earth to Neptune Solar System model have been performed. All Hilda asteroids were found to have very stable orbits and no sign of chaotic behaviour were seen in this integration spanning a time interval of 2 million years.


The first paper on the Hilda asteroids was published 1995 (Astronomy & Astrophysics 302, 907-914).

The second paper was printed 1997 (Astronomy & Astrophysics 323, 606-619). A Study of Hilda Asteroids II. Compositional implications from optical spectroscopy

The third paper was also published in Astronomy & Astrophysics (336, 1056-1064). A Study of Hilda Asteroids III. Collision velocities and collision frequencies of Hilda asteroids

The fifth paper was published 1998 (Icarus 133, 247-285). A Study of Hilda Asteroids V. Lightcurves of 47 Hilda asteroids

The sixth paper, A Study of Hilda Asteroids VI. Analysis of the lightcurve properties, was published during 1999 (Icarus 137, 259-267).

A paper dedicated to the asteroid 153 Hilda was published in Earth, Moon, and Planets, 71, 189-194.

Claes-Ingvar Lagerkvist