# Stars - Parallax 1 A form of triangulation 2 Parallax is a...

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Parallax 1. A form of triangulation 2. Parallax is a change in an object's apparent position caused by a change in the observer's position. 3. The radius of the earth's orbit is the baseline 4. Parallax is defined as one half the angle by which the star's position shifts PARSEC 5. The distance to a star that has the parallax of one second of an arc (very small angle) 6. 1 parsec is equal to 3.36 LY 7. Astronomers always use the distance unit PARSEC over Light Years. o d pc = ___1__ Psec of arc o d pc = distance measured in parsecs o P arc seconds = parallax measured in arc seconds 8. 1 arc second is _1_ of a degree 3600 9. Wien's Law (stellar temp.) o T(K) = _2.9 x 10^6 wavelength Max. 10. Luminosity o Luminosity is the amount of energy radiated by the entire star each second o Light decreases as the inverse square law 11. Inverse square law o Relates an object's luminosity to it's distance and it's apparent brightness (how bright it looks to us) 12. Stefan -Boltzman Law o An object of temperature

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Stars - Parallax 1 A form of triangulation 2 Parallax is a...

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