Abstract

The 18 cm lines of OH have been observed in more than 70 comets with the Nancay radio telescope since 1974. The observations made from 1982 to 1999 are now organized in a data base. The Nancay radio telescope has been recently upgraded, and observations since 2000 are made with a sensitivity increased by about a factor of two. Twelve comets were observed from July 2000 to May 2002.

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