On a transformation of the differential equations of the lunar theory |
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| Authors: | Peter Musen |
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| Institution: | (1) Goddard Space Flight Center, NASA, Greenbelt, Md., USA |
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| Abstract: | This work contains a transformation of Hill-Brown differential equations for the coordinates of the satellite to a type which can be integrated in a literal form using an analytical programming language. The differential equation for the parallax of the satellite is also established. Its use facilitates the computation of Hill's periodic intermediary orbit of the satellite and provides a good check for the expansion of the coordinates and frequencies. The knowledge of the expansion of the parallax facilitates the formation of differential equations for terms with a given characteristic. These differential equations are put into a form which favors the solution by means of iteration on the computer. As in the classical theory we obtain the expansions of the coordinates and of the parallax in the form of trigonometric series in four arguments and in powers of the constants of integration. We expand the differential operators into series in squares of the constants of integration. Only the terms of order zero in these expansions are employed in the integration of the differential equations. The remaining terms are responsible for producing the cross-effects between the perturbations of different order. By applying the averaging operator to the right sides of the differential equations we deduce the expansion of the frequencies in powers of squares of the constants of integration.Basic Notations
f
the gravitational constant
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E
the mass of the planet
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M
the mass of the satellite
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t
dynamical time
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x, y, z
planetocentric coordinates of the satellite
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u
x+y –1
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s
x–y–1
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the planetocentric distance of the satellite
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w
1/
- 0
the variational part of
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w
0
the variational part ofw,
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n
the mean daily sidereal motion of the satellite
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a
the mean semi-major axis of the satellite defined by means of the Kepler relation:a
3
n
2=f(E+M)
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a
the mean semi-major axis defined as the constant factor attached to the variational solution
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e
the constant of the eccentricity of the satellite
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the sine of one half the orbital inclination of the satellite relative to the orbit of the sun
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c(n–n )
the anomalistic frequency of the satellite
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c
0
the part ofc independent frome,e,  and 
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g(n–n)
the draconitic frequency of the satellite,
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g
0
the part ofg independent frome,e, and
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exp (n–n)t–1
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D
d/d
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e
the eccentricity of the solar planetocentric orbit
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a
the semi-major axis of the solar orbit
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n
the mean daily motion of the sun in its orbit around the planet
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m
n/(n–n)
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a/a-the parallactic factor
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the disturbing function |
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