Fast Spinning of Planets

Spin periods of Jupiter, Saturn, Uranus and Neptune are specified by the analysis of the resonant motion of large satellites: (P = 0.445(2),hbox {d}), 0.448(1) d, 0.673(9) d and 0.561(7) d, respectively. They occur to be near-commensurate with (P_0=9600.606(12),hbox {s}), the period of the “cosmic” oscillation, discovered first in the Sun, then in other variable objects of the Universe. The like analysis of spin rates of the total set of the largest and fastest rotators of the Solar system (with mean diameters (ge 500,hbox {km}) and (P < 2,hbox {d}),—of planets, asteroids and satellites) resulted in the best commensurable, or “synchronizing”, timescale 9594(65) s, coinciding fairly well with (P_0) too (the probability that the two timescales could agree by chance, is less than (10^{-5})). True origin of this odd common resonance of our planetary system is unknown.