Precession of triaxial cometary nuclei
Abstract
Comet nuclei are modeled as rotating, homogeneous, triaxial ellipsoids that precess during perihelion passage due to a subsolar dust and gas jet induced by solar heating. We develop a phaseaveraged system of equations in which the torque is averaged over a rotation about the spin axis. The inertial space precession of the rotation axis is computed numerically using the phaseaveraged system. The result is checked against independent calculations using the exact EulerPoisson system of equations.
 Publication:

Icarus
 Pub Date:
 June 1988
 DOI:
 10.1016/00191035(88)901091
 Bibcode:
 1988Icar...74..377J
 Keywords:

 Astronomical Models;
 Axes Of Rotation;
 Comet Nuclei;
 Euler Equations Of Motion;
 Gas Jets;
 Oblate Spheroids;
 Spin Dynamics;
 COMETS;
 COMET NUCLEI;
 PRECESSION;
 MODELS;
 JETTING;
 TORQUE;
 ROTATION;
 AXIS;
 NUMERICAL METHODS;
 CALCULATIONS;
 COMPARISONS;
 ENERGY;
 SOURCE;
 PARAMETERS;
 HALLEY;
 Astrophysics; Comets