Ammonia Hydrate in the Saturnian System

Details Ammonia Hydrate in the Saturnian System Ammonia Hydrate in the Saturnian System

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.6102v&link_type=abstract

American Astronomical Society, DPS meeting #40, #61.02; Bulletin of the American Astronomical Society, Vol. 40, p.510

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Using TripleSpec, a new infrared spectrograph at the Apache Point Observatory, we have recently acquired new high-resolution (R 3000) spectra 0.9 - 2.5 microns of Iapetus centered at longitudes 160 W and 359 W, Tethys' leading hemisphere, and the trailing hemispheres of Enceladus and Rhea. Several of these spectra show the absorption feature of ammonia hydrate at 2.21 microns also seen in the spectrum of Tethys' trailing hemisphere (Verbiscer et al. 2008, LPI Contribution No. 1406, p. 156). While this feature was also suggested in a spectrum of Enceladus obtained in 2004 at a latitude of 24 S (Verbiscer et al. 2006, Icarus 182, 211), it does not appear in the spectrum centered at latitude 11 S obtained in 2008 at the same longitude. In 2004, more of Enceladus' south polar terrain was visible than in 2008, and Cassini images have since shown that this region on Enceladus is particularly blue in addition to being geologically active.

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