Geometric transit probability
= Geometric transit probability
{title2=$p_{\rm tr}=(R_\star+R_p)/a$}
The probability that an isotropically oriented <circular orbit> produces an <exoplanet transit>, assuming $a>R_\star+R_p$. Uniformity of $|\cos i|$ gives the displayed result. <Orbital eccentricity>, a restriction to full rather than grazing crossings, or a non-isotropic orientation distribution changes the expression.