Upsilon Andromedae d
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In 1999, two groups of astronomers independently concluded that a three-planet model best fit the data. The two new planets were designated Upsilon Andromedae C and Upsilon Andromedae D.
References[change | change source]
- Butler R.P. et al. (1999). "Evidence for multiple companions to υ Andromedae". Astrophysical Journal 526 (2): 916–927. doi:10.1086/308035. http://www.iop.org/EJ/article/0004-637X/526/2/916/40403.html.