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Features of distribution of long-period comet orbits

Kalinicheva O. V., Chernetenko Yu. A.

Известия ГАО в Пулкове, № 225: Труды Всероссийской астрометрической конференции «Пулково-2018», Санкт-Петербург, 167–172 (2018)

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The paper discusses some statistical patterns in the distribution of the orbits of long–period comets belonging to the inner region of the Oort cloud (aphelion distances Q are in the range of 50–2000 AU). A significant deviation of the aphelion distribution from the uniform can be noted for Q in the range of 600–1000 AU. It is assumed that in this region of space there is a perturbing body (P) and relative to it there is a family of comets. By varying the inclination and longitude of the ascending node, we determined zone in the 20° relative to the plane with the largest number of aphelions (43% of the total). The orbital parameters of the body (P) in the galactic coordinate system are: Ω P = 170°, ω P = 150° ± 10°, i P = 40°, e P = 0.5± 0.1, Q P = 850 ± 25 AU