astro091

Prawa Keplera

Trts is the force necessary to keep the mass in a circular orbit

Sothat    . GM

V =-

T

_ 2tz r    2.71 r

=> P =- or v =-

v    P

Thus

2    4TT² T*² GM    _2    4?T² Z-³

v = —i—=— => p =--

P² r    GM

Or P² oc M

Kepler’s Thlrd Lawl