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Published on January 11, 2008

Author: Marco1

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Slide2:  Jupiter (Galileo) Saturn (Cassini) Uranus (Hubble) Neptune (Voyager) Everything You Need to Know about Ring Dynamics:  Everything You Need to Know about Ring Dynamics Newton: Force = Mass x Acceleration Law of Gravity Collisions Light-scattering Physics Slide5:  Main ring Dark side = High “phase angle”: emphasizes tiny dust grains Slide6:  “Halo” “Gossamer ring” discovery Slide7:  Two “Gossamer” rings Dusty rings must be sustained by source bodies (seen or unseen) Slide9:  A B C Encke Gap Cassini Division D F Lit side = Low “phase angle”: emphasizes large bodies Slide10:  E G Enceladus Earth! Unique high-phase view! F Slide11:  “Geysers” on Enceladus = the source of the E ring Cassini On-line Resources:  Cassini On-line Resources Cassini Main Site http://saturn.jpl.nasa.gov/ The latest raw images (cool!) http://saturn.jpl.nasa.gov/multimedia/images/raw/index.cfm Imaging Team Web Site http://ciclops.org/ Slide13:  The “Opposition Surge” on Saturn’s rings. This appears exactly opposite to the direction to the Sun, at phase angle 0°. The size of the surge is a measure of how rough the particles are. Slide15:  gamma eta lambda epsilon beta alpha 6, 5, 4 delta The main rings of Uranus Imaged by Voyager 2 Low phase = big particles Slide16:  The rings of Uranus at high phase > dust belts! Uranus in HST:  Uranus in HST Long exposures reveal rings:  Long exposures reveal rings Overlaying frames shows moons:  Overlaying frames shows moons Processing shows new rings!:  Processing shows new rings! Mab & the mu ring nu ring Slide23:  Liberté Fraternité Egalité Courage Leverrier ring Adams ring Neptune’s Changing Arcs:  Neptune’s Changing Arcs The arcs can now be detected by Hubble and ground-based telescopes. Since 1989, the leading arcs have advanced forward and faded. Gravity effects of the nearby moon Galatea help to confine the arcs …but the model is in trouble! Fun with Rings (1):  Fun with Rings (1) Vertical Ripples Slide27:  Enhanced Galileo image of Jupiter’s main ring A “wireframe” diagram showing vertical ripples in a ring Slide28:  D ring ripples that have been winding up since 1984! Fun with Rings (2):  Fun with Rings (2) Satellite “Wakes” Slide30:  Wavy edge of Encke Gap suggests an embedded moon. Color enhancement reveals “spiral” structure. Perturbed central ringlet Slide31:  The discovery of Pan in a sequence of five Voyager images Slide32:  A spectacular view of the Pan wake from Cassini direction to Pan Slide33:  Pan Imaged at Fine Resolution by Cassini Slide34:  The Discovery of Daphnis in the Keeler Gap: The wake is highly distorted Fun with Rings (3):  Fun with Rings (3) Saturn’s Pathological F Ring Slide36:  Ophelia Cordelia Two moons “shepherd” the epsilon ring of Uranus Slide37:  Pandora Prometheus Distant Voyager approach image: Is the F ring shepherded too? Slide38:  Saturn’s Famous “Braided” Ring! Slide39:  A Selection of Cassini Images Slide40:  Prometheus produces a “wake” pattern just like Pan Slide41:  The aftermath of a ring impact? Slide42:  A recent, new feature 200 km inward from the central ring 2007: A Good Year ahead for Ring Science…:  2007: A Good Year ahead for Ring Science… Cassini Extended Mission July 2008–June 2010:  Cassini Extended Mission July 2008–June 2010 Sample Tour Science planning is proceeding. Note that this period includes the equinox on August 11, 2009! New Horizons at Jupiter February 28, 2007:  New Horizons at Jupiter February 28, 2007 Slide46:  The first images of Jupiter from New Horizons Range is 1 AU Slide47:  Sample planned images during the New Horizons flyby Slide48:  2003 2005 2007: Equinox! Edge-on viewing: the main rings go dark search for “shepherds” see the dust rings better Slide50:  Remember what Amalthea and Thebe do at Jupiter! Slide51:  December, 2007: the best ring viewing geometry till 2022!

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