by bystander » Mon Oct 14, 2013 8:53 pm
NASA |
JPL-Caltech |
Cassini Solstice Mission |
CICLOPS | 2013 Oct 14
Lonely, Lumpy Janus
The irregularly shaped moon Janus keeps up its lonely orbit. Even though Janus shares its orbit with the moon Epimetheus, they never get very close to one another thanks to the gravitational resonance that swaps their orbits roughly every four years and ensures that they don't collide.
This view looks toward the anti-Saturn side of Janus. North on Janus is up and rotated 32 degrees to the right. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 15, 2013.
The view was obtained at a distance of approximately 750,000 miles (1.2 million kilometers) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 8 degrees. Image scale is 4 miles (7 kilometers) per pixel. The F ring has been brightened by a factor of 1.4 relative to the rest of the image to enhance visibility.
Credit: NASA/JPL-Caltech/Space Science Institute
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[quote]
[float=left][img3=""]http://s3.amazonaws.com/ciclops_ir_2013/7668_18301_2.png[/img3][/float]
[size=150][b][i]Lonely, Lumpy Janus[/i][/b][/size]
The irregularly shaped moon Janus keeps up its lonely orbit. Even though Janus shares its orbit with the moon Epimetheus, they never get very close to one another thanks to the gravitational resonance that swaps their orbits roughly every four years and ensures that they don't collide.
This view looks toward the anti-Saturn side of Janus. North on Janus is up and rotated 32 degrees to the right. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 15, 2013.
The view was obtained at a distance of approximately 750,000 miles (1.2 million kilometers) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 8 degrees. Image scale is 4 miles (7 kilometers) per pixel. The F ring has been brightened by a factor of 1.4 relative to the rest of the image to enhance visibility.
[b][i]Credit: NASA/JPL-Caltech/Space Science Institute[/i][/b] [/quote]
[url=http://asterisk.apod.com/viewtopic.php?t=32276][size=85][b][i]<< Previous Cassini[/i][/b][/size][/url]