EqnSummary-mt1 - Angle, distance, parallax a = 360o s/2d...

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Angle, distance, parallax • a = 360 o s/2 π d • a arcsec = s au /d pc a = angular size s = linear size d = distance a arcsec = angular size in arcsec s au = separation size in au d pc = distance in parsec (pc)
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Kepler’s 3rd law M+m = s 3 /P 2 M+m = combined mass (in M sun ) s = semi-major axis (in au) (for circ. orbits, s=separation) P = Period (in years)
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λ f = s • E = h f • F E = E/At = σ T 4 λ max =500 (T sun /T) Waves λ = wavelength f = frequency s= speed of wave (= c for light) Photon of light E = Energy h = Planck’s constant F E = surface ±ux of radiation (energy E per area A and time t) T = temperature (in K) λ max = wavelength of maximum intensity (in nm)
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Doppler shift λ obs = observed wavelength λ = Lab or “rest” wavelength • V = speed of emitter toward or away from the observer • c = speed of light = 300,000 km/s λ obs − λ = V c
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• Luminosity: L/L sun = (T/T sun ) 4 (R/R
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EqnSummary-mt1 - Angle, distance, parallax a = 360o s/2d...

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