R_1 = \frac{V}{2} (t_4-t_2) = \frac{200}{2} \ 12.66 \ 3600\ \sim\ 4.56\ 10^6 {\,\mathrm{km}}

R_2 = \frac{R_1}{2.37}\ \sim\ 1.93\ 10^6 {\,\mathrm{km}}

\rho = V \ \frac{P}{2\pi} = 200 \ \frac{(2 \times 24 + 22 ) \times 3600}{2 \times 3.14} = 8.02\ 10^6 {\,\mathrm{km}}