Determination of the Geodetic Rotation of the Solar System Bodies by means of Spectral Analysis Method G.I. Eroshkin and V.V. Pashkevich Central (Pulkovo) Astronomical Observatory of Russian Academy of Science St.Petersburg Space Research Centre of Polish Academy of Sciences Warszawa 2006

Here the index A means any point of Solar system or any Major body of Solar system; j – index for the summing all Major bodies of Solar system of the mathematical model of DE404/LE404 ephemeris; – gravitational constant; – mass of the j -th body; c – velocity of light in vacuum; – distance between points A and j ;,, and – barycentric vectors of the coordinate and velocity of these points; sign × is a vector product. If the point A is not a centre of the mass of the Sun the vector is practically orthogonal to the plane of the heliocentric orbit, so the mass of the Sun is the dominant mass of Solar system. The angular velocity vector of the geodetic rotation for any point of Solar system:

The problem of the geodetic (relativistic) rotation of the Sun, major planets, and the Moon is studied by using DE404/LE404 ephemeris and by means of Spectral Analysis Method. For every of these bodies the files of the ecliptic components of the vector of the geodetic rotation were formed over time span from AD1000 to AD3000 at intervals of one day. Using the least-squares method and spectral analysis methods the secular and periodic components of the geodetic rotation vector were determined. The mean longitudes of the planets and the Moon adjusted to DE404/LE404 ephemeris were taken from Brumberg and Bretagnon (2000).

The Earth For the Earth the component, orthogonal to the plane of the fixed ecliptic J was determined: This result is a very good agreement with that found analytically (Brumberg and Bretagnon, 2000). The method was applied to the other bodies of the solar system.

The Earth For the Earth the component, orthogonal to the plane of the fixed ecliptic J was determined: This result is a very good agreement with that found analytically (Brumberg and Bretagnon, 2000). The method was applied to the other bodies of the solar system.

The Earth (in detail)

The Moon

The Moon (in detail)

Mercury

Mercury (in detail)

Venus

Venus (in detail)

Mars

Mars (in detail)

Jupiter Saturn

Jupiter Saturn

Jupiter (in detail)

Jupiter Saturn

Saturn (in detail)

Uranus Neptune Pluto

Mercury (in detail)

DISCUSSION DE404/LE404 ephemeris is used for the definition of the geodetic rotation of the reference frame of DE404/LE404 ephemeris – the angular velocity vector of the reference frame of DE404/LE404 ephemeris.

Here the index A means any point of Solar system or any Major body of Solar system; j – index for the summing all Major bodies of Solar system of the mathematical model of DE404/LE404 ephemeris; – gravitational constant; – mass of the j -th body; c – velocity of light in vacuum; – distance between points A and j ;,, and – barycentric vectors of the coordinate and velocity of these points; sign × is a vector product. If the point A is not a centre of the mass of the Sun the vector is practically orthogonal to the plane of the heliocentric orbit, so the mass of the Sun is the dominant mass of Solar system. The angular velocity vector of the geodetic rotation for any point of Solar system:

Ecliptic components of the angular velocity vector of the Barycentre of Solar system

Ecliptic components of the angular velocity vector of the Barycentre of Solar system (in detail)

R E F E R E N C E S 1.V.A..Brumberg, P.Bretagnon Kinematical Relativistic Corrections for Earth’s Rotation Parameters // in Proc. of IAU Colloquium 180, eds. K.Johnston, D. McCarthy, B. Luzum and G. Kaplan, U.S. Naval Observatory, 2000, pp. 293– Landau L.D. and Lifshitz E.M., The Classical Theory of Fields: 1967, Moscow: "Nauka", pp (in Russian)

A C K N O W L E D G M E N T S The investigation was carried out at the Central (Pulkovo) Astronomical Observatory of Russian Academy of Science and the Space Research Centre of Polish Academy of Science, under a financial support of the Cooperation between Polish and Russian Academies of Sciences, Theme No 31.