向心力之比：F1:F2=GMm1/r1^2:GMm2/r2^2=m1/m2*(r2/r1)^2=2/9。速率之比：GMm/r^2=mV^2/r，V=√GM/r，V1:V2=√r2/r1=1:√3。向心加速度之比：GMm/r^2=ma，a=GM/r^2，a1:a2=(r2/r1)^2=1:9和周期比：T^2与r^3成正比T1:T2=(r1/r2)^3/2=3^3/2=3√3:1
