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Compositional maps of Saturn's moon Phoebe from imaging spectroscopy

Nature

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DOI: 10.1038/nature03558

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Abstract

The origin of Phoebe, which is the outermost large satellite of Saturn, is of particular interest because its inclined, retrograde orbit suggests that it was gravitationally captured by Saturn, having accreted outside the region of the solar nebula in which Saturn formed. By contrast, Saturn's regular satellites (with prograde, low-inclination, circular orbits) probably accreted within the sub-nebula in which Saturn itself formed. Here we report imaging spectroscopy of Phoebe resulting from the Cassini-Huygens spacecraft encounter on 11 June 2004. We mapped ferrous-iron-bearing minerals, bound water, trapped CO2, probable phyllosilicates, organics, nitriles and cyanide compounds. Detection of these compounds on Phoebe makes it one of the most compositionally diverse objects yet observed in our Solar System. It is likely that Phoebe's surface contains primitive materials from the outer Solar System, indicating a surface of cometary origin.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Compositional maps of Saturn's moon Phoebe from imaging spectroscopy
Series title:
Nature
DOI:
10.1038/nature03558
Volume
435
Issue:
7038
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
66
Last page:
69
Number of Pages:
4