| Distance Scales |
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| • | Parallax
and Trigonometric Methods |
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| – | tan λ
= Vt/Vr = μd/Vr |
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| – | So
then d = Vr tanλ/4.74μ [pc] |
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| – | Where
velocities are in km/s and proper motion |
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| μ
is in arcseconds per year. |
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| – | Should
be something you can derive (it would |
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| be a
good problem to work in your free time) |
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