| タイトル | A Cassini ISS Search for Regolith-Texture Variations on Tethys |
| 本文（外部サイト） | http://hdl.handle.net/2060/20050169998 |
| 著者（英） | Knowles, B.; Porco, C.; West, R. A.; Ververka, J.; Neukum, G.; Helfenstein, P.; Denk, T.; Thomas, P. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 2005-01-01 |
| 言語 | eng |
| 内容記述 | On October 28, 2004 the Cassini spacecraft flew within 255,500km of Saturn's heavily-cratered icy moon, Tethys. The ISS Narrow Angle Camera (NAC) obtained its first closeup multi-color images of Tethys at a Voyager-comparable spatial resolution of 1.5 km/pixel. The imaging sequence provided 23 NAC images covering 10 NAC color-filter bandpasses (ranging from 338nm to 930nm wavelengths), as well as a Wide Angle Camera (WAC), 3-color (BGR) image set. The images show whole-disk views of Tethys' trailing hemisphere viewed at a phase angle of 50 degrees and with a sub-spacecraft point of (22 deg. N, 270 deg. W). At the spatial resolution of our NAC images, Tethys' 1060 km diameter presents a disk-size of about 350 pixels. Among the images returned are nine frames obtained through NAC polarization-filters at three different spectral bandpasses (UV3: 341nm, GRN: 569nm, and MT2: 727 nm, respectively). In the present study, we use these polarization images to search for possible variations in the microscopic texture of regolith on Tethys. |
| NASA分類 | Lunar and Planetary Science and Exploration |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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