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The 16OH/18OH and OD/OH isotope ratios are measured in the Oort-Cloud cometC/2002 T7 (LINEAR) through ground-based observations of the OH ultravioletbands at 3063 A (0,0) and 3121 A (1,1) secured with the Very Large Telescope(VLT) feeding the Ultraviolet-Visual Echelle Spectrograph (UVES). From the16OH/18OH ratio, we find 16O/18O = 425 +/- 55, equal within the uncertaintiesto the terrestrial value and to the ratio measured in other comets, althoughmarginally smaller. We also estimate OD/OH from which we derive D/H = 2.5 +/-0.7 10-4 in water. This value is compatible with the water D/H ratios evaluatedin other comets and marginally higher than the terrestrial value.

The 16OH/18OH and OD/OH isotope ratios in comet C/2002 T7 (LINEAR)