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Cassini spies the ice-giant planet Uranus beyond Saturn's rings

Date:
May 2, 2014
Source:
NASA/Jet Propulsion Laboratory
Summary:
NASA's Cassini spacecraft has captured its first-ever image of the pale blue ice-giant planet Uranus in the distance beyond Saturn's rings.

This view from NASA's Cassini spacecraft features a blue planet, but unlike the view from July 19, 2013 (PIA17172) that featured our home planet, this blue orb is Uranus, imaged by Cassini for the first time.
Credit: NASA/JPL-Caltech/Space Science Institute

NASA's Cassini spacecraft has captured its first-ever image of the pale blue ice-giant planet Uranus in the distance beyond Saturn's rings.

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The robotic spacecraft briefly turned its gaze away from the ringed beauty of Saturn on April 11, 2014, to observe the distant planet, which is the seventh planet from the sun.

The image is available at: http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA17178

The planets Uranus and Neptune are sometimes referred to as "ice giants" to distinguish them from their larger siblings, Jupiter and Saturn, the classic "gas giants." The moniker derives from the fact that a comparatively large part of the planets' composition consists of water, ammonia and methane, which are typically frozen as ices in the cold depths of the outer solar system. Jupiter and Saturn are made almost entirely of hydrogen and helium, with smaller percentages of these ices.

When this view was obtained, Uranus was nearly on the opposite side of the sun as seen from Saturn, at a distance of approximately 28.6 astronomical units from Cassini and Saturn. An astronomical unit is the average distance from Earth to the sun, equal to 93 million miles (150 million kilometers). At their closest -- once during each Saturn orbit of nearly 30 years -- the two planets approach to within about 10 astronomical units of each other.

In addition to its aesthetic appeal, Cassini's view of Uranus also serves a practical purpose. Scientists working on several of Cassini's science investigations expect that they will be able to use images and spectra from these observations to help calibrate their own instruments.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology, Pasadena, manages the mission for NASA's Science Mission Directorate in Washington.

More information about Cassini is available at the following sites:


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Jet Propulsion Laboratory. "Cassini spies the ice-giant planet Uranus beyond Saturn's rings." ScienceDaily. ScienceDaily, 2 May 2014. <www.sciencedaily.com/releases/2014/05/140502115703.htm>.
NASA/Jet Propulsion Laboratory. (2014, May 2). Cassini spies the ice-giant planet Uranus beyond Saturn's rings. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2014/05/140502115703.htm
NASA/Jet Propulsion Laboratory. "Cassini spies the ice-giant planet Uranus beyond Saturn's rings." ScienceDaily. www.sciencedaily.com/releases/2014/05/140502115703.htm (accessed October 31, 2014).

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