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Thermal response of Iapetus to an eclipse by Saturn's rings |
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| Authors: | G Neugebauer K Matthews PD Nicholson I Gatley SVW Beckwith |
| Institution: | a Hale Observatories, California Institute of Technology, Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA b California Institute of Technology, Pasadena, CA 91125, USA c 7519 S. Eliot Lane, Tuscon, AZ 85747, USA d Department of Astronomy, Cornell University, Ithaca, NY 14853, USA |
| Abstract: | Measurements of Iapetus as seen at 20 and 2.2 μm in the shadow of Saturn's ring are given, providing the thermal response to a rapidly varying heat input. The 20 μm thermal emission follows the 2.2 μm flux input closely. The observations, plus a simple diffusion calculation, imply that the surface of Iapetus is made of material having a very small thermal inertia, probably  . |
| Keywords: | Satellites of Saturn Infrared observations Planetary rings Saturn Eclipses |
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