MMT Reflectance Spectral Observations of Irregular Outer Jovian Satellites: Testing the Presence of Aqueous Alteration

Details MMT Reflectance Spectral Observations of Irregular Outer Jovian Satellites: Testing the Presence of Aqueous Alteration MMT Reflectance Spectral Observations of Irregular Outer Jovian Satellites: Testing the Presence of Aqueous Alteration

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6408v&link_type=abstract

American Astronomical Society, DPS meeting #38, #64.08; Bulletin of the American Astronomical Society, Vol. 38, p.613

Astronomy and Astrophysics

Astronomy

Scientific paper

The strong correlation between the 3.0-µm water of hydration absorption feature and the 0.7-µm Fe2+ - Fe3+ feature suggesting oxidized iron in phyllosilicates is used to probe the existence of aqueous alteration in the surface materials of the irregular outer jovian satellites. Using broadband VRI photometry converted to ECAS v, w, and x photometry coupled with an algorithm previously defined by E. Howell (Ph.D. Thesis, U. Arizona, 1995) to detect the presence of the 0.7-µm feature in ECAS photometry, aqueous alteration was found on the surface of irregular outer jovian satellites (Vilas et al., Icarus 180, 453, 2006). The dynamical clusters of outer irregular jovian satellites are mixed between objects that do and do not show this absorption feature. Multiple observations of some objects test both positively and negatively, similar to the surface variegation that has been observed among many C-class asteroids in the main asteroid belt. In order to test this result, VNIR narrowband spectroscopy was obtained of irregular satellites JVI Himalia, JVII Elara, JVIII Pasiphae, JIX Sinope, JXI Carme, JXII Ananke on UT 31 Mar, 31 May, and 1,2 Jun 2006 using the MMT Observatory facility Red Channel spectrograph with a resolution of 20 Å (6.38 Å/pixel dispersion), centered near 6400 Å to cover the 0.7-µm feature entirely. These spectra sample the prograde (i = 28o), two retrograde (i = 149o, 165o) and independent satellites. This satellite sample also includes both grey and slightly reddened satellites identified by Grav et al. (Icarus 166, 33, 2003). These new spectra will be presented.

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