Observations of the 18-cm OH lines of comet 103P/Hartley 2 at Nan\c{c}ay   in support to the EPOXI and Herschel missions
  The 18-cm radio lines of the OH radical were observed in comet 103P/Hartley 2 with the Nan\c{c}ay radio telescope in support to its flyby by the EPOXI mission and to observations with the Herschel Space Observatory. The OH lines were detected from 24 September to 15 December 2010. These observations are used to estimate the gas expansion velocity within the coma to 0.83 \pm 0.08 km/s in October 2010. The water production increased steeply but progressively before perihelion, and reached 1.9 \pm 0.3 X 10E28 s-1 just before the EPOXI flyby. 
Jacques Crovisier, Pierre Colom, Nicolas Biver, Dominique   Bockel\'ee-Morvan, J\'er\'emie Boissier
astro-ph.EP