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HD 1461
HD 1461 (32 G. Ceti) is a G0V class star slightly more massive than the Sun (G2V), and located about 76 light-years away in the constellation of Cetus.
== Planetary system ==
On 14 December 2009, scientists announced the discovery at least one planet orbiting around HD 1461.〔 The planet, a super-Earth with a 5.8-day orbit was designated HD 1461 b. The data also contained evidence for additional planets with orbital periods of around 400 and 5000 days but the star showed small variations with similar periods, casting doubt on the interpretation of these signals as being caused by orbiting planets.
In September 2011, a paper was published on the arXiv pre-print server giving an orbital solution incorporating data from the HARPS spectrograph. This solution recovered the previously-known planet HD 1461 b, and an additional planet in a 13.5-day orbit. No mention was made of the proposed 400 and 5000-day candidates. As of June 2014, this paper has not yet been published in a refereed scientific journal.
Other than HD 1461 b, the designations for the planets are inconsistent: in the original paper, Rivera et al. designated the 400 and 5000-day candidates as "c" and "d" respectively, whereas the Mayor et al. (2011) pre-print uses the "c" designation for the 13.5-day planet and does not mention the 400-day or 5000-day planets at all.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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