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JOVIAN DREAMS
Hubble Captures Rare Triple-Moon Conjunction
by Staff Writers
Baltimore MD (SPX) Feb 06, 2015


Image courtesy NASA, ESA, and the Hubble Heritage Team (STScI/AURA). For a larger version of this image please go here.

Firing off a string of action snapshots like a sports photographer at a NASCAR race, NASA's Hubble Space Telescope captured the rare occurrence of three of Jupiter's largest moons racing across the banded face of the gas-giant planet: Europa, Callisto, and Io.

These so-called Galilean moons, named after the 17th century scientist Galileo Galilei, who discovered them with a telescope, complete orbits around Jupiter with durations ranging from 2 days to 17 days. They can commonly be seen transiting the face of Jupiter and casting shadows onto its cloud tops. However, seeing three moons transiting the face of Jupiter at the same time is rare, occurring only once or twice a decade.

The Hubble image on the left shows the beginning of the event, which took place on January 24, 2015. From left to right, the moons Callisto and Io are above Jupiter's cloud tops. The shadows from Europa, Callisto, and Io are strung out from left to right. Europa is not visible in this image.

Near the end of the event, approximately 42 minutes later (right-side image) Europa has entered the frame at lower left. Slower-moving Callisto is above and to the right of Europa. Fastest-moving Io is approaching the eastern limb of the planet; its shadow is no longer visible on Jupiter. Europa's shadow is toward the left side of the image, and Callisto's shadow to the right. The moons' orbital velocities are proportionally slower with increasing distance from the planet.

Missing from the sequence is Ganymede, one of the four Galilean moons that was outside Hubble's field of view and too far from Jupiter to be part of this conjunction.

The moons in these photos have distinctive colors. The ancient cratered surface of Callisto is brownish; the smooth icy surface of Europa is yellow-white; and the volcanic, sulfur-dioxide surface of Io is orange. The apparent "fuzziness" of some of the shadows depends on the moons' distances from Jupiter. The farther away a moon is from the planet, the softer the shadow, because the shadow is more spread out across the disk.

The images were taken with Hubble's Wide Field Camera 3 in visible light.


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Related Links
Hubble Space Telescope
Jupiter and its Moons
Explore The Ring World of Saturn and her moons
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News Flash at Mercury






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JOVIAN DREAMS
NASA planning Europa mission, Jupiter's potentially life-hosting moon
Pasadena, Calif. (UPI) Feb 3, 2015
The big ticket items - the Space Launch System, the Orion capsule, the Commercial Crew program - grabbed the big bucks and the headlines, as NASA unveiled the White House's 2015 budget proposal. But some astronomers and science fans are most excited about the inclusion of a new mission: a trip to Europa, Jupiter's fourth largest moon. While the capturing of an asteroid, a return to th ... read more


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