We use the SPIRE Fourier-Transform Spectrometer ( FTS ) on-board the ESA Herschel Space Telescope to analyse the submillimetre spectrum of the Ultra-compact H II region G29.96-0.02 .
Spectral lines from species including ^ { 13 } CO , CO , [ CI ] , and [ NII ] are detected .
A sparse map of the [ NII ] emission shows at least one other HII region neighbouring the clump containing the UCHII .
The FTS spectra are combined with ISO SWS and LWS spectra and fluxes from the literature to present a detailed spectrum of the source spanning three orders of magnitude in wavelength .
The quality of the spectrum longwards of 100 \mu m allows us to fit a single temperature greybody with temperature 80.3 \pm 0.6 K and dust emissivity index 1.73 \pm 0.02 , an accuracy rarely obtained with previous instruments .
We estimate a mass of 1500 M _ { \odot } for the clump containing the H II region .
The clump ’ s bolometeric luminosity of 4 \times 10 ^ { 6 } L _ { \odot } is comparable to , or slightly greater than , the known O-star powering the UCH II region .