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Table 1:

HIFI observations of water vapour in comet 81P/Wild 2 and derived water production rates.
Obs. ID  UT start date $\Delta$ $r_{\rm h}$ Band Frequency Integration time Intensity Velocity shift $Q_{\mbox{H$_2$ O}}{}$a
  [mm/dd.ddd] [AU] [AU]   [GHz] [s] [K kms-1] [ms-1] [ $10^{28}\ {\rm s}^{-1}$]
1342190098 02/1.443 0.949 1.612 1a 556.9360 684 $1.807 \pm 0.012$ $4~\pm~$ 5 $1.00 \pm 0.05$
1342190185 02/4.235 0.927 1.609 1b 556.9360 748 $2.077 \pm 0.015$ $-10~\pm~$ 5 $1.13 \pm 0.06$
1342190231 02/2.134 0.943 1.611 4b 1113.3430 390 $1.997 \pm 0.053$ $-58~\pm~$ 21 $1.07 \pm 0.06$
1342190232 02/2.151 0.943 1.611 4b 1113.3430 366 $1.594 \pm 0.052$ $-41~\pm~$ 26 $0.86 \pm 0.05$

Notes.  The observations were acquired in February 2010 using the standard fast DBS cross map observing mode. The intensity, velocity shift and $Q_{\mbox{H$_2$ O}}{}$ correspond to the average of the central points in the cross maps.(a) Water production rates computed with T = 40 K and $x_{n_{\rm e}}{} = 0.2$. The error bar includes a 5% calibration uncertainty in the sideband gain ratio.


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