by bystander » Mon Nov 04, 2013 6:52 pm
NASA |
JPL-Caltech |
Cassini Solstice Mission |
CICLOPS | 2013 Oct 21
Two Shepherds Meet
Although their gravitational effects on nearby ring material look quite different, Prometheus and Pan -- pictured here -- are both shepherd moons, holding back nearby ring edges.
Pan (17 miles,or 28 kilometers across), near the right edge of the image, holds open the Encke gap that it orbits in. Prometheus (53 miles, or 86 kilometers across), near the upper left, helps shape the F ring and maintain its narrow form.
This view looks toward the unilluminated side of the rings from about 47 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 27, 2013.
The view was acquired at a distance of approximately 870,000 miles (1.4 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 81 degrees. Image scale is 5 miles (8 kilometers) per pixel.
Credit: NASA/JPL-Caltech/Space Science Institute
<< Previous CassiniNASA | [url=http://photojournal.jpl.nasa.gov/catalog/PIA17133]JPL-Caltech[/url] | [url=http://saturn.jpl.nasa.gov/photos/imagedetails/index.cfm?imageId=4895][b]Cassini Solstice Mission[/b][/url] | [url=http://www.ciclops.org/view/7650/][b]CICLOPS[/b][/url] | 2013 Oct 21
[quote]
[float=left][img3=""]http://s3.amazonaws.com/ciclops_ir_2013/7650_18305_2.png[/img3][/float]
[size=150][b][i]Two Shepherds Meet[/i][/b][/size]
Although their gravitational effects on nearby ring material look quite different, Prometheus and Pan -- pictured here -- are both shepherd moons, holding back nearby ring edges.
Pan (17 miles,or 28 kilometers across), near the right edge of the image, holds open the Encke gap that it orbits in. Prometheus (53 miles, or 86 kilometers across), near the upper left, helps shape the F ring and maintain its narrow form.
This view looks toward the unilluminated side of the rings from about 47 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 27, 2013.
The view was acquired at a distance of approximately 870,000 miles (1.4 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 81 degrees. Image scale is 5 miles (8 kilometers) per pixel.
[b][i]Credit: NASA/JPL-Caltech/Space Science Institute[/i][/b] [/quote]
[url=http://asterisk.apod.com/viewtopic.php?t=32299][size=85][b][i]<< Previous Cassini[/i][/b][/size][/url]