On the origin of the prograde rotation of the planets

Details On the origin of the prograde rotation of the planets On the origin of the prograde rotation of the planets

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992avest..26...54k&link_type=abstract

Astronomicheskii Vestnik (ISSN 0320-930X), vol. 26, no. 6, p. 54-78.

Astronomy and Astrophysics

Astronomy

Angular Momentum, Orbit Calculation, Planetary Mass, Planetary Rotation, Circular Orbits, Rayleigh Distribution

Scientific paper

A series of analytic and numerical calculations of the systematic component of angular momentum accretion is described. Wide ranges of planetesimal eccentricities and planetary radii are considered. Numerical simulations using a Rayleigh distribution of eH values show that very little prograde rotation is produced in a disk with a realistically broad range of planetesimal eccentricities. It is hypothesized that the observed spin rates may result from nonuniformities in the disk of planetesimals, specifically, a partial gap in planetesimal semimajor axes around that of the planet. This would yield an overabundance of impactors from the edges of the planet's accretion zone. Bodies from this region produce strongly prograde rotation at most values of eH.

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