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Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft

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Abstract

Dynamicalmass estimates for the main asteroid belt and the trans-Neptunian Kuiper belt have been found from their gravitational influence on the motion of planets. Discrete rotating models consisting ofmovingmaterial points have been used tomodel the total attraction fromsmall or as yet undetected bodies of the belts. The masses of the model belts have been included in the set of parameters being refined and determined and have been obtained by processing more than 800 thousand modern positional observations of planets and spacecraft. We have processed the observations and determined the parameters based on the new EPM2017 version of the IAA RAS planetary ephemerides. The large observed radial extent of the belts (more than 1.2 AU for the main belt and more than 8 AU for the Kuiper belt) and the concentration of bodies in the Kuiper belt at a distance of about 44 AU found from observations have been taken into account in the discrete models. We have also used individual mass estimates for large bodies of the belts as well as for objects that spacecraft have approached and for bodies with satellites. Our mass estimate for the main asteroid belt is (4.008 ± 0.029) × 10−4/m⊕ (3σ). The bulk of the Kuiper belt objects are in the ring zone from 39.4 to 47.8 AU. The estimate of its total mass together with the mass of the 31 largest trans-Neptunian Kuiper belt objects is (1.97 ± 0.30) × 10−2m⊕ (3σ), which exceeds the mass of the main asteroid belt almost by a factor of 50. The mass of the 31 largest trans-Neptunian objects (TNOs) is only about 40% of the total one.

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Article11 September 2018

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Author information

Authors and Affiliations

  1. Institute of Applied Astronomy, Russian Academy of Sciences (IAA RAS), nab. Kutuzova 10, St. Petersburg, 191187, Russia

    E. V. Pitjeva & N. P. Pitjev

  2. St. Petersburg State University, Universitetski pr. 28, St. Petersburg, 198504, Russia

    N. P. Pitjev

Authors
  1. E. V. Pitjeva
  2. N. P. Pitjev

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Correspondence toE. V. Pitjeva.

Additional information

Original Russian Text © E.V. Pitjeva, N.P. Pitjev, 2018, published in Pis’ma v Astronomicheskii Zhurnal, 2018, Vol. 44, Nos. 8–9, pp. 604–617.

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Pitjeva, E.V., Pitjev, N.P. Masses of the Main Asteroid Belt and the Kuiper Belt from the Motions of Planets and Spacecraft.Astron. Lett.44, 554–566 (2018). https://doi.org/10.1134/S1063773718090050

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