AAWSAP DIRD, An Introduction to the Statistical Drake Equation, March 2010
DOW-UAP-D127 · page 19 of 55
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which is equation (153) of Appendix B, and
$$
\sigma_{\text{ET\_Distance}} = C e^{-\frac{\mu}{3}} e^{\frac{\sigma^2}{18}} \sqrt{e^{\frac{\sigma^2}{9}} - 1} \approx 1,309 \text{ light years} \quad (13)
$$
which is equation (154) of Appendix B.
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