Pollux (Beta Geminorum)
Discovery of a planet around PolluxOn Jun. 16, 2006, a team of astronomers (including A. P. Hatzes, W. D. Cochran, E. Endl, E. W. Guenther, S. H. Saar, G. A. H. Walker, S. Yang, M. Hartmann, M. Esposito, and D. B. Paulson) confirmed the presence of a Jupiter-class planet around Pollux. Pollux b had been first detected in 1993. Assuming a mass for Pollux of 1.7 solar masses, Pollux b has a minimum mass of 2.3 +/- 0.45 Jupiter-masses. It moves around Pollux at an average distance of 1.64 +/- 0.27 AU in a nearly circular orbit (eccentricity = 0.02 +/- 0.03) with a period of 1.6 years (589.64 +/- 0.81 days).
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