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Near-Infrared Photometry of Irregular Satellites of Jupiter and Saturn

By SpaceRef Editor
March 8, 2004
Filed under , ,

Astrophysics, abstract

From: Tommy Grav [view email]
Date (v1): Mon, 22 Dec 2003 01:12:13 GMT (443kb)
Date (revised v2): Thu, 4 Mar 2004 20:29:03 GMT (54kb)

Near-Infrared Photometry of Irregular Satellites of Jupiter and Saturn

Tommy Grav (ITA, University in Oslo & Harvard-Smitsonain CfA),
Matthew J. Holman (Harvard-Smithsonian CfA)

Comments: Accepted by ApJ Letters (emulateapj, 8pages, including 4 figures);
Typos corrected, references added

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, P and D-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 similar near-infrared colors, as do the two members of the
Gallic family, S XX Paaliaq and S XXIX Siarnaq. From low resolution normalized
reflectance spectra based on the broadband colors and covering 0.4 to 2.2
microns, the irregular satellites are identified as C-type (J VII Pasiphae, 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 a diversity of origins of these

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