Volume 441, Number 1, October I 2005
|Page(s)||L5 - L7|
|Published online||13 September 2005|
Letter to the Editor
On the density of EKOs and related objects
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: firstname.lastname@example.org
2 Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany e-mail: email@example.com
3 IRAM, Domaine Universitaire de Grenoble, 300 rue de la piscine, 38406 St. Martin d'Hères, France e-mail: firstname.lastname@example.org
Accepted: 11 August 2005
Recently published mass determinations of EKO binaries, combined with photometric size determinations, allow to derive a mean density of the distant minor planets of ≈0.2 g cm-3. This agrees well with the nuclear density of 1P/Halley of 0.26 g cm-3, determined in the Giotto mission, and it suggests that these low density objects are essentially undifferentiated planetesimals.
Key words: minor planets: general / comets: individual: Halley
© ESO, 2005
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