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File:PIA 10544 Helene.jpg

PIA_10544_Helene.jpg ‎(300 × 300 pixels, file size: 29 KB, MIME type: image/jpeg)

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Summary

Description

The small moon Helene (33 kilometers, 21 miles across) leads Dione by 60 degrees in the moons' shared orbit. Helene is a "Trojan" moon of Dione, named for the Trojan group of asteroids that orbit 60 degrees ahead of and behind Jupiter as it circles the Sun.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 24, 2008 at a distance of approximately 68,000 kilometers (42,000 miles) from Helene and at a Sun-Helene-spacecraft, or phase, angle of 30 degrees. Image scale is 408 meters (1,338 feet) per pixel.

The Cassini Equinox Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini Equinox Mission visit http://ciclops.org, http://www.nasa.gov/cassini and http://saturn.jpl.nasa.gov.

The original NASA image has been modified by cropping, doubling the linear pixel density and sharpening.
Date
Source http://ciclops.org/view.php?id=5393
Author NASA / JPL / Space Science Institute
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA10544.

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Licensing

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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24 November 2008

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current12:43, 21 February 2010300 × 300 (29 KB)WolfmanSF{{Information |Description=The small moon Helene (33 kilometers, 21 miles across) leads Dione by 60 degrees in the moons' shared orbit. Helene is a "Trojan" moon of Dione, named for the Trojan group of asteroids that orbit 60 degrees ahead of and behind J

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