shepherd satellites

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• Shepherd Satellite —    A satellite which maintains the structure of rings around a planet through the effects of the satellites gravity. The F ring of Saturn has two shepherd moons, Prometheus and Pandors, which maintain its structure …   The writer's dictionary of science fiction, fantasy, horror and mythology

• List of natural satellites — This article is about the moons of planets and dwarf planets. For asteroid or minor planet moons, see Minor planet moon. Objects in the Solar System By orbit …   Wikipedia

• 23060 Shepherd — Infobox Planet minorplanet = yes width = 25em bgcolour = #FFFFC0 apsis = name = Shepherd symbol = caption = discovery = yes discovery ref = discoverer = Lincoln Laboratory Near Earth Asteroid Research Team discovery site = Socorro discovered =… …   Wikipedia

• Planetary ring — Shepherd moon redirects here. For the Enya album, see Shepherd Moons. The moons Prometheus and Pandora shepherd the F ring of Saturn. A planetary ring is a ring of cosmic dust and other small particles orbiting around a planet in a flat disc… …   Wikipedia

• Moons of Saturn — Artist s concepts of the Saturnian ring–moon system Saturn, its rings and major icy moons from Mimas to Rhea …   Wikipedia

• Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… …   Wikipedia

• Inner moon — In astronomy, an inner moon is a natural satellite following a prograde, low inclination orbit inwards of the large satellites of the parent planet. They are generally thought to have been formed in situ at the same time as the coalescence of the …   Wikipedia

• Rings of Uranus — The scheme of Uranus s ring moon system. Solid lines denote rings; dashed lines denote orbits of moons. The planet Uranus has a system of rings intermediate in complexity between the more extensive set around Saturn and the simpler systems around …   Wikipedia

• Saturn — /sat euhrn/, n. 1. an ancient Roman god of agriculture, the consort of Ops, believed to have ruled the earth during an age of happiness and virtue, identified with the Greek god Cronus. 2. Astron. the planet sixth in order from the sun, having an …   Universalium

• Antarctique — Pour les articles homonymes, voir Antarctique (homonymie). Antarctique L Antarctique vue du pôle Sud Superficie …   Wikipédia en Français

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium