Near-infrared Spectroscopy of Centaurs and Irregular Satellites
نویسنده
چکیده
We have obtained near-infrared spectra of the four brightest known Centaurs and of Ðve irregular satellites of giant planets. Many of these objects show 1.5 and 2.0 km absorption bands indicative of water ice, including 1997 Pholus, Phoebe (S9), and Nereid (N2). The satellites of JupiterÈElara, 26 Himalia, and Pasaphae (J6, J7, J8)Èappear spectrally featureless, consistent with asteroidal origins for these bodies. PhoebeÏs surface water ice indicates that it formed as an icy planetesimal rather than as an asteroid.
منابع مشابه
Near-Infrared Photometry of Irregular Satellites of Jupiter and Saturn
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