67P/Churyumov-Gerasimenko - Potential Target for the Rosetta Mission

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

Abstrakty

EN

Influence of the non-gravitational effects on the motion of short-period comet 67P/Churyumov-Gerasimenko is investigated. It was found that the normal component of the non-gravitational force exceeds the transverse one and a model of the motion including A₁, A₂, A₃ better fits the observations than model neglecting A₃. Assuming asymmetry in g(r) with respect to the perihelion the large value of displacement τ was derived (about 34 days), and very small negative value of transverse component A₂ was obtained. The models of rotating non-spherical nucleus also suggest the large shift of light curve with respect to perihelion (τ≥30). The forced precession model of 67P with τ=34 days gives a prolate spheroidal shape of the rotating nucleus with axial ratio R_b/R_a=1.16, rotational period to equatorial radius P_rott/R_a=4.6±1.4 hrs/km, and torque factor f_tor=3×10⁵ day/a.u. The orientation of spin axis of the nucleus and its evolution are presented. The past and the future dynamical evolution of comet 67P is also widely discussed.

Słowa kluczowe

EN

Comets: general; Comets: individual: 67P/Churyumov-Gerasimenko

• Czasopismo: Acta Astronomica
• Rocznik: 2003
• Tom: Vol. 56, No. 2
• Strony: 195--208
• Opis fizyczny: Bibliogr. 17 poz., tab., wykr.

Twórcy

autor

Królikowska, M.

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

Bibliografia

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