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The present paper reviews selected aspects of the Guliyev's hypothesis aboutthe massive celestial body at a distance of 250-400 AU from the Sun as well asthe factor of comets transfer. It is shown, that the conjecture of the pointaround which cometary perihelia might be concentrated, is not consistent. Onthe issue of perihelia distribution, priority should be given to the assumptionthat there is a plane or planes around which the concentration takes place. Atotal of 24 comet groups were investigated. In almost all cases there aredetected two types of planes or zones: the first one is very close to theecliptic, another one is about perpendicular to it and has the parameters: ip =86{\deg}, {\Omega}p = 271.7{\deg}. The existence of the first area appears tobe related to the influence of giant planets. The Guliyev's hypothesis saysthat there is a massive perturber in the second zone, at a distance of 250-400AU. It shows that number of aphelia and distant nodes of cometary orbits inthis interval significantly exceeds the expected background. Analysis of theangular parameters of the comets, calculated relative to the second plane(reference point is the ascending node of a large circle) displays clearpatterns: shortage of comets near i' = 180{\deg}, excess of them near B'=0{\deg} (ecliptic latitude of perihelion) and shortage near B'=-90{\deg}. Theanalysis also shows irregularity of distant nodes, overpopulation of perihelionlongitudes in the range 350{\deg}-20{\deg}. Plotted distributions of apheliaN(Q) and distant cometary nodes clearly indicate a perturbation of the naturalcourse near 300 AU. On the basis of collected cometary data, we have estimatedorbital elements of the hypothetical planetary body: a = 337 AU; e = 0.14;{\omega} = 57{\deg}; {\Omega} = 272.7{\deg}; i = 86{\deg}.

Distribution specificities of long-period comets' perihelia. Hypothesis of the large planetary body on the periphery of the Solar System