Rotational transition frequencies from astronomical observations were reported by
(1) M. Agúndez, C. Cabezas, N. Marcelino, R. Fuentetaja, B. Tercero, P. de Vicente, and J. Cernicharo, 2022, Astron. Astrophys. 659, Art. No. L9.
Calculations beyond 160 GHz should be viewed with caution. Hyperfine splitting may be resolvable for the lowest one or two transitions, but accurate numbers are not known yet.
The dipole moment was taken from a quantum chemical calculation in
(2) J. Cernicharo, N. Marcelino, M. Agúndez, Y. Endo, C. Cabezas, C. Bermúdez, B. Tercero, and P. de Vicente, 2020, Astron. Astrophys. 642, Art. No. L17.