Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1605g&link_type=abstract
American Astronomical Society Meeting 203, #16.05; Bulletin of the American Astronomical Society, Vol. 35, p.1233
Astronomy and Astrophysics
Astronomy
Scientific paper
We present JHKs photometry of 10 Jovian and 4 Saturnian irregular satellites, taken with the Near-InfraRed Imager (NIRI) at the 8-m Gemini North Observatory on Mauna Kea, Hawaii. The observed objects have near-infrared colors consistent with C,F,D and P-type asteroids, although J XII Ananke and S IX Phoebe show weak indications of possible water features in the H filter. The four members of the Himalia-family have homogeneous near-infrared colors, as do the two members of the Gallic family, S XX Paaliaq and S XXIX Siarnaq, thus strengthening the arguments supporting the dynamical clusters as remainders of larger progenitors that were captured and subsequently broken up (Grav et al. 2003). Creating low resolution normalized reflectance spectra from 0.4 to 2.2 microns the irregular satellites are identified as C-type (J VII Pasiphae), F-type (J VI Himalia and S IX Phoebe), P-type (J XII Ananke and J XVIII Themisto) and D-type (J IX Carme and J X Sinope), showing significant diversity, and hinting to several different regions as the origin of the satellite progenitors.
The work was supported by NASA grant NAG5-13276 and by the Smithsonian Predoctoral Fellowship Program.
Grav Tommy
Holman Matthew J.
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