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Saturns Moon Phoebe Was From The Solar Nebula

Posted on May 6, 2005 By jim No Comments on Saturns Moon Phoebe Was From The Solar Nebula

Scientists Discover Pluto Kin Is a Member of Saturn Family

Saturn’s battered little moon Phoebe is an interloper to the Saturn system from the deep outer solar system, scientists have concluded. The new findings appear in the May 5 issue of the journal Nature.

Image right: Saturn’s moon Phoebe. Image credit: NASA/JPL/Space Science Institute.

“Phoebe was left behind from the solar nebula, the cloud of interstellar gas and dust from which the planets formed,” said Dr. Torrence Johnson, Cassini imaging team member at NASA’s Jet Propulsion Laboratory, Pasadena, Calif. “It did not form at Saturn. It was captured by Saturn’s gravitational field and has been waiting eons for Cassini to come along.”

Cassini flew by Phoebe on its way to Saturn on June 11, 2004. Little was known about Phoebe at that time. During the encounter, scientists got the first detailed look at Phoebe, which allowed them to determine its makeup and mass. With the new information they have concluded that it has an outer solar system origin, akin to Pluto and other members of the Kuiper Belt.

“Cassini is showing us that Phoebe is quite different from Saturn’s other icy satellites, not just in its orbit but in the relative proportions of rock and ice. It resembles Pluto in this regard much more than it does the other Saturnian satellites,” said Dr. Jonathan Lunine, Cassini interdisciplinary scientist from the University of Arizona, Tucson.

Phoebe has a density consistent with that of the only Kuiper Belt objects for which densities are known. Phoebe’s mass, combined with an accurate volume estimate from images, yields a density of about 1.6 grams per cubic centimeter (100 pounds per cubic foot), much lighter than most rocks but heavier than pure ice, which is about 0.93 grams per cubic centimeter (58 pounds per cubic foot). This suggests a composition of ice and rock similar to that of Pluto and Neptune’s moon Triton. Whether the dark material on other moons of Saturn is the same primordial material as on Phoebe remains to be seen.

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