Star Characteristics How far (R in parsecs)?

Distance to nearby star determined from stellar parallax, (see Power Point) which is ½ the maximum angular difference in position:

R (in parsecs) = 1/ (in arc seconds)

1 parsec is the distance at which the parallax of a star is 1 arc second. Parallax method works for stars closer than about 100 parsecs. (1 parsec = 3.26 LY.)

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