Table \PageIndex1: Astronomical constants. Astronomical unit 1.49597870×1011m Obliquity of ecliptic (J2000) Solar mass M⊙ \(1.9891 \times 10^{30} \;\mathrm{k...Table \PageIndex1: Astronomical constants. Astronomical unit 1.49597870×1011m Obliquity of ecliptic (J2000) Solar mass M⊙1.9891×1030kg Solar radius R⊙ Earth grav. GM⊕3.986004415×1014m3s−2 Sun grav. GM⊙1.32712440041×1020m3s−2 Table \PageIndex1: Planetary Data. Orbit semi-major axis (Gm)