Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aca....56..385k&link_type=abstract
Acta Astronomica, Vol. 56, pp.385-412
Astronomy and Astrophysics
Astronomy
7
Oort Cloud, Comets: General
Scientific paper
The influence of the non-gravitational effects on the original and future orbital elements of long-period comets and in particular on reciprocals of semi-major axes is analyzed. The new orbit determinations were performed in a homogeneous way using the basic collection of 50 nearly-parabolic comets of first class orbits. The data consist of 20 hypothetically hyperbolic comets (sample I), 11 Oort spike comets (sample II), and 19 ``old'' comets (sample III). The original and future reciprocals of semi-major axes for each comet were calculated for strictly gravitational case and the non-gravitational case in a fully consistent way. Clear shift of the original reciprocals of semi-major axes toward the more elliptical orbits is confirmed. The average values of the original and future energy changes due to the non-gravitational acceleration are derived for each of three samples independently. Omission of the NG effects significantly affects the position and width of the Oort spike. The shift of the Oort spike position from the standard 1/a_ori value of 2-4 dot 10^-5 a.u.^-1 to a value greater than 5.9 dot 10^-5 a.u.^-1 is discussed.
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