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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 r/P = r a c = V 2 /r v F = Gm 1 m 2 /r 2 r PE = Gm 1 m 2 /r V 2 circ = GM/r a 3 AU = P 2 yr a 3 = GMP 2 / 4 2 f = c E = hf = hc/ dif = 1 . 22 /D max T = 2 . 9 10 3 m K F = dE/dt A F = T 4 L = 4 R 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/ 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( M / m ) 1 / 3 R M n = n e t t 1 / 2 = ln 2 / NOTE: the above symbols may have dierent meanings in dierent equations!...
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This note was uploaded on 10/06/2011 for the course ASTRO 210 taught by Professor Fields during the Spring '08 term at University of Illinois, Urbana Champaign.
 Spring '08
 Fields
 Astronomy

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