Observed positions of Uranus and Neptune along with residuals in right ascension and declination are used to constrain the location of a postulated tenth planet. The residuals are converted into residuals in ecliptic longitude and latitude. The results are then combined into seasonal normal points, producing average geocentric residuals spaced slightly more than a year apart that are assumed to represent the equivalent heliocentric average residuals for the observed oppositions. Such a planet is found to most likely reside in the region of Scorpius, with considerably less likelihood that it is in Taurus.
link: http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1988AJ.....96.1476H&fbclid=IwAR2ieT3joNQ_sWXVocDNloHWdHy3WNcVWHZh3amwiXMfmUk6OY573ZM9r0M
Title: The location of Planet X
Authors: Harrington, R. S.
Journal: Astronomical Journal (ISSN 0004-6256), vol. 96, Oct. 1988, p. 1476-1478.
The article "The location of Planet X" was written by Dr. R.S. Harrington, of the US Naval Observatory in Washington. In this article he calculated several parameters of Planet X and its orbit. Harrington started from the perturbatians in the orbits of Neptune and Uranus, knowing that Pluto could not be responsible for them. The observations he used were supplied by the Nautical Almanac Office of the US Naval Observatory and go back as far as 1833 for Uranus and 1846 for Neptune. A weight was assigned to the data because later observations were more accurate than earlier ones, but he still thought it important to give enough weight to the early data, in order to be able to give them some significance in a solution for long period effects.
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