Five Planets Orbiting 55 Cancri

@article{Fischer2008FivePO,
  title={Five Planets Orbiting 55 Cancri},
  author={Debra A. Fischer and Geoffrey W. Marcy and R. Paul Butler and Steven S. Vogt and Gregory P. Laughlin and Gregory W. Henry and David Abouav and Kathryn M. G. Peek and Jason T. Wright and John Asher Johnson and Chris McCarthy and Howard T. Isaacson},
  journal={The Astrophysical Journal},
  year={2008},
  volume={675},
  pages={790 - 801}
}
We report 18 years of Doppler shift measurements of a nearby star, 55 Cancri, that exhibits strong evidence for five orbiting planets. The four previously reported planets are strongly confirmed here. A fifth planet is presented, with an apparent orbital period of 260 days, placing it 0.78 AU from the star in the large empty zone between two other planets. The velocity wobble amplitude of 4.9 m s−1 implies a minimum planet mass Msin i = 45.7 M⊕. The orbital eccentricity is consistent with a… 

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