Comet C/2014 Q2 (Lovejoy): average on-nucleus spectra of the H216O (110−101) line at 556.936 GHz, and H218O (110−101) line at 547.676 GHz obtained with Odin between 30 January and 3 February 2015. The spectrum of the HDO (211−212) line at 241.561 GHz observed with the IRAM 30 m telescope on 13−24 January 2015 is shown below. While the H218O and HDO lines are marginally blue-shifted (Δ v = −0.07 km s-1 in both cases) the H216O (110−101) line is asymmetric and red-shifted (Δ v = + 0.33 km s-1) due to self absorption by the cool gas in the foreground of this optically thick line. Vertical scale is main beam brightness temperature and horizontal scale Doppler velocity in the comet rest frame.
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