Non-Gravitational Effects in Long-Period Comets and the Size of the Oort Cloud

• Autorzy: Królikowska, M.
• Języki publikacji: EN

Abstrakty

EN

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/aori value of 2-4×10^-5 a.u.^-1 to a value greater than 5.9×10^-5 a.u.^-1 is discussed.

Słowa kluczowe

EN

Oort Cloud; Comets: general

• Czasopismo: Acta Astronomica
• Rocznik: 2006
• Tom: Vol. 56, No. 4
• Strony: 385--412
• Opis fizyczny: Bibliogr. 34 poz., tab., wykr.

Twórcy

autor

Królikowska, M.

• Space Research Centre of the Polish Academy of Sciences, ul. Bartycka 18A, 00-716, Warsaw, Poland ,

Bibliografia

• Bailey, M.E. 1984, MNRAS, 211, 347.
• van Biesbroeck, G. 1957, Astron. J., 62, 191.
• Dones, L., Weissman, P.R., Levison, H.F., and Duncan, M.J. 2004, “Oort Cloud Formation and Dynamics", in: Comets II, Eds. M.C. Festou, H.U. Keller, and H.A. Weaver (University of Arizona, Tucson) p. 153.
• Duncan, M., Quinn, T., and Tremaine S. 1987, Astron. J., 94, 1330.
• Dybczyński, P.A. 2001, Astron. Astrophys., 375, 643.
• Emel’yanenko, V.V., and Bailey, M.E. 1998, MNRAS, 298, 212.
• Eggers, S. 1999, Ph.D. thesis, Max Planck Institut für Aeronomie, Katlenburg-Lindau, Germany.
• Fernandez, J.A. 2002, Proceedings of Asteroids, Comets, Meteors ACM, ESA SP-500, 303.
• Fernandez, J.A., and Brunini, A. 2000, Icarus, 145, 580.
• Heisler, J. 1990, Icarus, 88, 104.
• Hughes, D.W. 1991, J. Br. Astron. Assoc., 101, 119.
• Hughes, D.W. 2001, MNRAS, 326, 515.
• Królikowska, M. 2001, Astron. Astrophys., 376, 316 (Paper I).
• Królikowska, M. 2004, Astron. Astrophys., 427, 1117 (Paper II).
• Levison, H.F., Dones, L., and Duncan, M.J. 2001, Astron. J., 121, 2253.
• Marsden, B.G. 1970, IAU Circ., 2884.
• Marsden, B.G. and Sekanina Z. 1973, Astron. J., 78, 1118.
• Marsden, B.G., Sekanina Z., and Yeomans, D.K. 1973, Astron. J., 78, 211.
• Marsden, B.G., Sekanina Z., and Everhart, E. 1978, Astron. J., 83, 64.
• Marsden, B.G., and Williams, G.V. 2005, Catalog of Cometary Orbits, Sixteenth ed. (MW catalog).
• Nurmi, P., Valtonen, M.J., Zheng, J.Q., and Rickman, H. 2002, MNRAS, 333, 835.
• Oort, J.H. 1950, Bull. Astron. Inst. Neth., 11, 91.
• Rickman, H. 2004, “Current Questions in Cometary Dynamics”, in Comets II, Eds. M.C. Festou, H.U. Keller, and H.A. Weaver (University of Arizona, Tucson) p. 205.
• Rickman, H. 2005, “Transport of comets to the Inner Solar System”, Proceedings of Dynamics of Populations of Planetary Systems, Ed. Z. Knezevic, and A. Milani p. 277.
• Roemer, E. 1955, PASP, 67, 424.
• Sekanina, Z. 1979, Icarus, 38, 300.
• Sen, A.K., and Rana, N.C. 1993, Astron. Astrophys., 275, 298.
• Sitarski, G. 1989, Acta Astron., 39, 345.
• Sitarski, G. 2002, Acta Astron., 52, 471.
• Weissman, P.R. 1980, Astron. Astrophys., 85, 181.
• Weissman, P.R. 1985, in: Dynamics of Comets: Their Origin and Evolution, Eds: Carusi, A., and Valsecchi, IAU Colloquium 83, Reidel, Dordrecht, 87.
• Wiegert, P., and Tremaine, S. 1999, Icarus, 137, 84.
• Yabushita, S. 1979, MNRAS, 187, 445.
• Yabushita, S. 1996, MNRAS, 283, 347.