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\begin{equation}\label{eq:system_equivalent_flux_density}  SEFD = {\frac{T_{sys}}{\frac{\eta_a A}{2k_B}}}  \end{equation}  where $T_{sys}$ is the system temperature including contributions from receiver noise, feed losses, spillover, atmospheric emission, galactic background and cosmic background (Crane & Napier 1989).  $k_B = 1.380 x 10^{-23}$ Joule $K^{-1}$ is the Boltzmann constant, $A$ is the antenna collecting area, and $\eta_a$ is the antenna efficiency. efficiency with  \begin{equation}\label{eq:antenna_efficiency}  \eta_a = \eta_{surface} * \eta_{blockage} * \eta_{spillover} * \eta_{taper}  \end{equation} 
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