The presence of acetylene has been confirmed for some time in the atmospheres of the outer planets Jupiter, Saturn, Neptune, and Saturn's satellite Titan. For these atmospheres, the determination of C2H2 abundances using its strongs &ngr;5 fundamental requires laboratory line position and intensity measurements. The 1-meter Fourier transform spectrometer at McMath solar telescope of Kitt Peak National Observatory was used to measure C2H2 at an unapodized spectral resolution of 0.0025 cm-1. Synthetic spectra are generated by convolving a Voigt line shape with an instrument function and varying intensity parameters by means of nonlinear least squares technique. Intensities of 37 &ngr;5 lines spanning P18 through R20 were measured using 0.123 torr of gas in a 1-cm cell. A Herman-Wallis intensity correction parameter Apr1 = 1.3(4) ¿ 10-3 has been derived using a least squares linear fit. ¿ American Geophysical Union 1991