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lunar.c File Reference

A simple custom driver adding the mean lunar quadrupole. More...

`#include <math.h>`
`#include <hnbody/kernel.h>`
Include dependency graph for lunar.c:

## Functions
void | lunar_version (FILE *f, const char *prefix)
void | lunar_kick (double(*dv)[3], double t, double(*x)[3], const double m[], int nHL, int n, double dt, const hnb_data_t *sys)
double | lunar_energy (double t, double(*x)[3], double(*v)[3], const double m[], int nNL, const hnb_data_t *sys)
int | main (int argc, char *argv[])

## Detailed Description

Id
  lunar.c,v 1.7 2004/02/13 22:58:57 rauch Exp

SRC-Level: ISO C
MT-Level: TBD

Author
  Kevin P. Rauch

This custom driver includes the extra kick and energy due to the Sun's attraction on the mean Earth-Moon quadrupole, as derived by Quinn, Duncan, & Tremaine (1991). If `QTD_DRIVER` is defined, the expansion of the lunar orbit due to tidal dissipation is included and the standard correction factor f = 0.9473 is used. This fully duplicates the Quinn et al. calculation. Otherwise (and by default), the dissipation is neglected (it is useful mainly when Earth-Moon rigid body dynamics are being calculated, and it also breaks energy conservation at the rate of 1e-13 per Myr), and the correction f = 0.8525 is used. The latter was found by Varadi, Runnegar, & Ghil (2003) to minimize long-term errors in Earth's orbital elements (note that this turns out to be at the expense of short-term accuracy, however.)

Returns
  EXIT_SUCCESS on success, else EXIT_FAILURE.

See also
  hnb_argv_driver()