Double check these in the almanac

[Joshuaalbert]

GM_BODIES = {
    'sun': const.GM_sun,
    'moon': 0.0123 * const.GM_earth,
    'mercury': 0.0553 * const.GM_earth,
    'venus': 0.815 * const.GM_earth,
    'mars': 0.107 * const.GM_earth,
    'jupiter': const.GM_jup,
    'saturn': 95.16 * const.GM_earth,
    'uranus': 14.54 * const.GM_earth,
    'neptune': 17.15 * const.GM_earth
}

RADII_BODIES = {
    'sun': const.R_sun,
    'moon': 0.2727 * const.R_earth,
    'mercury': 0.3829 * const.R_earth,
    'venus': 0.9499 * const.R_earth,
    'earth': const.R_earth,
    'mars': 0.5320 * const.R_earth,
    'jupiter': const.R_jup,
    'saturn': 9.45 * const.R_earth,
    'uranus': 4.01 * const.R_earth,
    'neptune': 3.88 * const.R_earth
}

J2_COEFFS = {
    'sun': 2.2e-7,
    'moon': 2.034e-4,
    'mercury': 6.0e-6,
    'venus': 4.458e-6,
    'earth': 1.08263e-3,
    'mars': 1.960e-3,
    'jupiter': 1.4736e-2,
    'saturn': 1.6298e-2,
    'uranus': 3.34343e-3,
    'neptune': 3.411e-3
}