Author/Authors :
Altwegg، نويسنده , , K. and Balsiger، نويسنده , , H. and Calmonte، نويسنده , , U. and Hنssig، نويسنده , , M. and Hofer، نويسنده , , L. and Jنckel، نويسنده , , A. and Schlنppi، نويسنده , , B. and Würz، نويسنده , , P. and Berthelier، نويسنده , , J.J. and De Keyser، نويسنده , , J. and Fiethe، نويسنده , , B. and Fuselier، نويسنده , , S. and Mall، نويسنده , , U. and Rème، نويسنده , , H. and Rubin، نويسنده , , M.، نويسنده ,
Abstract :
During the Rosetta flyby at asteroid Lutetia the ROSINA instrument tried to detect a thin exosphere of the asteroid. Although the instrument is sensitive enough to detect even very tenuous gases at a density level of 1 cm−3 the Lutetia exosphere could not be unambiguously detected due to spacecraft outgassing, which was not constant because of the changing solar aspect angle. An upper limit for a water exosphere density at the flyby distance of 3160 km of (3.5±1.0)×103 cm−3 was deduced from the measurements.
Keywords :
Exosphere , Spacecraft outgassing , Rosetta , ROSINA , Lutetia , In situ mass spectrometry
