Constraints on the location of a possible 9th planet derived from the Cassini data

A. Fienga, J. Laskar, H. Manche, M. Gastineau
(Submitted on 19 Feb 2016)

To explain the unusual distribution of Kuiper Belt objects, several authors have advocated the existence of a super-Earth planet in the outer solar system. It has recently been proposed that a 10 M⊕ object with an orbit of 700 AU semi major axis and 0.6 eccentricity can explain the observed distribution of Kuiper Belt objects around Sedna. Here we use the INPOP planetary ephemerides model as a sensor for testing for an additional body in the solar system. We test the possibility of adding the proposed planet without increasing the residuals of the planetary ephemerides, fitted over the whole INPOP planetary data sample. We demonstrate that the presence of such an object is not compatible with the most sensitive data set, the Cassini radio ranging data, if its true anomaly is in the intervals [−130?:−100?] or [−65?:85?]. Moreover, we find that the addition of this object can reduce the Cassini residuals, with a most probable position given by a true anomaly v=117.8?+11?−10?.

Comments: Accepted for publication in A&A; 4 pages, 6 figures
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1602.06116 [astro-ph.EP] (or arXiv:1602.06116v1 [astro-ph.EP] for this version)
Submission history
From: Jacques Laskar
[v1] Fri, 19 Feb 2016 11:51:43 GMT (787kb,D)
http://arxiv.org/abs/1602.06116