\[Y_{\nu}'\left(y_{\nu,1}\right)\sim 0.95554\;86\nu^{-\frac{2}{3}}\div(1+0.74526%
\;1\nu^{-\frac{2}{3}}+0.10910\nu^{-\frac{4}{3}}-0.0185\nu^{-2}-0.003\nu^{-%
\frac{8}{3}}+\cdots),\]