Dynamical effects of comet P/Halley gas production

Citation
K. Szego et al., Dynamical effects of comet P/Halley gas production, ASTRON ASTR, 370(2), 2001, pp. L35-L38
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
2
Year of publication
2001
Pages
L35 - L38
Database
ISI
SICI code
0004-6361(200105)370:2<L35:DEOCPG>2.0.ZU;2-0
Abstract
We revisit tile rotation of P/Halley taking into account the most essential observational constraints. as well as the external torques affecting the n ucleus, in particular the outgassing torque. We solve tile dirty ice sublim ation equations at each point of the sunlit surface, using, for tile first time, the surface shape derived from the 1986 flybys imaging data. We assum e that the nuclear surface is homogeneous in composition, thus reducing the number of model free parameters to one only: the dust-to-ice ratio on the surface. Our derived rotation model is a short-axis model it is consistent both with the 1986 nucleus imaging data. with tile estimated non gravitatio nal force, and with the observed time variations of the nucleus production rates. The outgassing torque results in a significant variation of the angu lar momentum vector - for the assumed nucleus density of 0.5 g/cm(3).