Unformatted text preview: kg R ⊙ = 7 . × 10 8 m R Earth = 6 . 4 × 10 6 m R Jupiter = 7 . × 10 7 m L ⊙ = 3 . 8 × 10 26 Watt T ⊙ = 5800 K age of Sun ≃ 4 . 6 × 10 9 yr v F = mva v L = mv r × v p V circ = 2 πr/P = ωr a c = V 2 /r v F = Gm 1 m 2 /r 2 ˆ r PE = − Gm 1 m 2 /r V 2 circ = GM/r a 3 AU = P 2 yr a 3 = GMP 2 / 4 π 2 λf = c E γ = hf = hc/λ θ dif = 1 . 22 λ/D λ max T = 2 . 9 × 10 − 3 m K F = dE/dt A F = σT 4 L = 4 πR 2 F T = [(1 − A ) / (2 or 4)] 1 / 4 ( R ⊙ /d ) 1 / 2 T ⊙ = (332 or 279 K)[(1 − A ) /d 2 ] 1 / 4 V 2 esc = 2 GM/R V 2 rms = 3 kT/μ V esc ≥ 6 V rms to retain gas F tide = 2 GMmR/d 3 R Roche = 2 . 4( M/m ) 1 / 3 r m = 2 . 4( ρ M /ρ m ) 1 / 3 R M n = n e − λt t 1 / 2 = ln 2 /λ NOTE: the above symbols may have di²erent meanings in di²erent equations!...
View
Full Document
 Spring '08
 Fields
 Astronomy, Mass, Astronomical unit, Physical constant, Test Booklet

Click to edit the document details