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How the Geysers, Tidal Stresses, and Thermal Emission across the South Polar Terrain of Enceladus are Related

  • Authors: Carolyn Porco, Daiana DiNino, and Francis Nimmo

Porco, DiNino, & Nimmo 2014 The Astronomical Journal 148 45.

  • Provider: AAS Journals

Caption: Figure 1.

(a) Mosaic of the highest resolution images used in this study. Image scale ∼80 m pixel−1 and a phase angle of ∼145°. (b) Top: an image taken from set BBB at a spatial scale of ∼400 m pixel−1 and a phase angle of ∼163° on 2010 November 30, 1.4 yr after the southern autumnal equinox. The shadow of the body of Enceladus on the lower portions of the jets is clearly seen. Bottom: an ISS image showing the intersection of the shadow of the body of Enceladus with three of the four planes in which the geysers reside. The lines represent the reprojection of Enceladus' shadow on a plane normal to the “top-left” branch of the Cairo fracture (bottom line), normal to the Baghdad fracture (middle line), and normal to the Damascus fracture (upper line). (c) Top: an image from set YY, looking roughly in the direction of Saturn, taken on 2010 August 13, with image scale ∼70 m pixel−1, showing the Saturn-facing ends of Baghdad and its jet-active spur, and Damascus and its split ends. In this set, jets are indistinct and tilts are indeterminate, though their source locations are clearly seen. This set was used for confirmation of source locations triangulated using other images. Bottom: same image with labels. (d) The sole image from set JJJ showing Jet #99, whose location was determined directly by use of the height of the shadow falling on it (Figure 3(b)). (e) The sole image from set XX showing Jet #100, whose location was determined directly by use of the height of the shadow falling on it (Figure 3(b)). (f) An image taken on 2007 September 30 showing Jet #101 seen only in set U. Its source location is indeterminate but the nearly parallel ground tracks derived from two images in this set are shown in Figure 3(b).
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