Author/Authors :
Morse، نويسنده , , A.D. and Altwegg، نويسنده , , K. and Andrews، نويسنده , , D.J. and Auster، نويسنده , , H.U. and Carr، نويسنده , , C.M. and Galand، نويسنده , , M. and Goesmann، نويسنده , , F. and Gulkis، نويسنده , , S. and Lee، نويسنده , , S. and Richter، نويسنده , , I. and Sheridan، نويسنده , , S. and Stern، نويسنده , , S.A. and AʹHearn، نويسنده , , M.F. and Feldman، نويسنده , , P. and Parker، نويسنده , , J. and Retherford، نويسنده , , K.D.، نويسنده ,
Abstract :
On 10th July 2010 the Rosetta spacecraft passed within 3160 km of asteroid 21 Lutetia during which seven instruments attempted to detect an exosphere. A comparison of the sensitivity is made between the different instruments based on a simple spherical out-gassing point source model, which was used to infer that the Lutetia exosphere production rate was determined by MIRO to be <4.3×1023 molecules s−1 for water and by ROSINA RTOF to be <1.7×1025 molecules s−1 for carbon monoxide. Consideration of the flyby geometry and combined instrument operations places further constraints on the exosphere structure and gas production rate. Experience gained during the flyby will prove invaluable for operations planning during Rosettaʹs approach and orbit of comet 67P/Churyumov–Gerasimenko in 2014.
Keywords :
Exosphere , Lutetia , asteroid , Rosetta , COMET
