We modeled observations of the C-2 d(3)Pi(g)-a(3)Pi(u) (Swan) Delta nu = 0 sequence observed in spectra of comet 122P/de Vico obtained with the 2.7 m Harlan J. Smith Telescope and Tull Coude spectrograph of McDonald observatory on 10/3/1995 and 10/4/1995. The data used spanned 4986-5169 A at R = lambda/Delta lambda = 60 000. We used the PGOPHER molecular spectra model to generate and fit synthetic spectra with the d(3)Pi(g) having one and two rotational temperatures. We found that the excited state had a two-component rotational temperature, similar to that found for comet Halley. The modeled spectrum was sufficiently high quality that local perturbations were important to include. The large perturbation, b(3)Sigma(-)(g)(nu = 10), was added to our fits, and some new estimates of its molecular constants were found.