Abstract
SEARCH FOE A PLANET OUTSIDE NEPTUNE.—Ever since the discovery of Neptune by the perturbations that it produced on Uranus, attempts have been made to extend the method to still more remote regions. Prof. W. H. Pickering is one of those who have attacked this problem; in his research he examined the observations of Saturn, Uranus, and Neptune, and noted discordances between prediction and observation. His latest paper on the subject is in Popular Astronomy for March. He notes that if Adams and Le Verrier had used Saturn as well as Uranus in their calculations, they would have had material for making a better estimate of the distance and period of the perturbing planet; the reason being that conjunctions of the unknown planet with Saturn occurred every 36 years, so that the observations covered several conjunctions.
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Our Astronomical Column. Nature 121, 598 (1928). https://doi.org/10.1038/121598a0
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DOI: https://doi.org/10.1038/121598a0