Astronomers have discovered a Jupiter-like planet orbiting a nearby star, which is one of a binary pair, by precisely tracing a small, almost imperceptible, wobble in that star’s motion through space. Their work produced the first-ever determination of the complete, 3-dimensional structure of the or
have been discovered so far, only three have been discovered using a technique called astrometry, which was used to produce this discovery. However, the feat of determining the 3-D architecture of a binary-star system that includes a planet “cannot be achieved with otherdiscovery methods,” said Salvador Curiel, of the National Autonomous University of Mexico .
The two stars, which together are called GJ 896AB, are about 20 light-years from Earth. That makes them close neighbors of ours by astronomical standards. They are red dwarf stars, the most common type of star in ourgalaxy. The larger one, around which the planet orbits, has about 44 percent of the mass of our Sun, while the smaller one is about 17 percent as massive as the Sun.
According to calculations by the astronomers, the planet has about twice the mass of Jupiter and orbits the star every 284 days. Its distance from the star is slightly less than’ distance from the Sun. The planet’s orbit is inclined approximately 148 degrees from the orbits of the two stars.
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