Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..912b&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.912
Astronomy and Astrophysics
Astronomy
Scientific paper
The stratospheric water 557 GHz line was first observed in 1999 by the SWAS satellite which revealed a broad (20 km s-1) emission line. But in 2009, the Herschel Space Observatory revealed an additional 20% deep and narrow (6 km s-1) absorption line in the core [4]. Subsequent analysis implies that this absorption line is caused by the cold water vapor contained in a torus located at the Enceladus orbit position. It is thought to be populated by the water escaping Enceladus through the plumes put into evidence by the Cassini spacecraft. The tilt of Saturn equator relative to the Earthwas unfavorable in 1999 to see it in absorption against Saturn disk but the geometry in 2011 was expected to enable such detection with the Odin satellite [5]. The Odin submm observatory astronomy program was specially reactivated to monitor the water line of Saturn between 21 and 24 January 2011 to cover two complete orbits of Enceladus around Saturn.
Biver Nicolas
Bockelée-Morvan Dominique
Florén Hans-Gustav
Frisk Urban
Hartogh Paul
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