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This is a picture made by an artist to show what the Jupiter-like planet orbiting the star, 55 Cancri, might look like. We do not have photographs of what it actually looks like because the planet is about 41 light years from Earth. A small moon is shown in front of the planet because moons are thought to be common around this type of planet, but no moon has been found.
Click on image for full size

An Exoplanet that Looks Like Jupiter!
News story originally written on June 18, 2002

Astronomers Dr. Geoffrey Marcy and Dr. Paul Butler announced that, after 15 years of observation, their team has found 13 extrasolar planets (or exoplanets), and that one of these exoplanets may be somewhat like Jupiter. The planet that reminds the scientists of Jupiter is orbiting a star called 55 Cancri, within the Cancer constellation.

The research team is very excited about the discovery of this planet because it is very different from any of the other 90 or so exoplanets that have been identified so far. As Dr Marcy states, ďall other extrasolar planets discovered up to now orbit closer to the parent star, and most of them have had elongated, eccentric orbits. This new planet orbits as far from its star as Jupiter orbits from the Sun

Jupiter is about four and a half times further from the Sun than Earth and it takes the planet about 12 years to complete one orbit around the Sun. The new planet, a similar distance from 55 Cancri, takes 13 years to orbit around the star.

The new planet is not the only one orbiting 55 Cancri. There is another exoplanet, discovered in 1996, that orbits very close to the star. Scientists suspect that there may be a third exoplanet orbiting the star as well.

The new planet is not exactly like Jupiter, however. It is much more massive than Jupiter, with a mass about 3.5-5 times greater. Its orbit is also different than Jupiterís, taking an elliptical route around the star. Even though differences exist, the scientific team is encouraged that we may someday find more exoplanets that are like those in our own solar system.


Last modified June 24, 2002 by Lisa Gardiner.

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