この文章の和訳をお願いします。
Now, the orbital elements (e, i, b, τ, ω) appearing in Eq. (14) are those at infinity. However, we cannot carry out an orbital calculation from infinity. In practice, we start to compute orbits from a sufficiently large but finite distance. Hence, we have to find the relation between orbital elements at infinity and those at a starting point. For b, it is readily done by Eq. (17); denoting quantities at a starting point of orbital calculations by subscripts “s”, we obtain
b_s=(b^2-8/r_s)^(1/2), ・・・・・・・・(19)
where we assumed e_s^2=e^2 and i_s^2=i^2 in the same manner as earlier. Hénon and Petit (1986) obtained a more accurate and complicated expression of b_s in the two-dimensional case. However, since we are now interested only in the averaged collisional rate but not detailed behavior of orbital motion, it is sufficient to use the simple relation (19).
よろしくお願いします。
補足
回答は完全に僕が求めているものです。 ただ、感覚的にも分かっていない場合は他にどんな方法がありますか？ うちには、660 nmのOD値を測れる吸光光度計があるので、それを使って何か方法が考えられないでしょうか?