A star with a trigonometric parallax of .02 arcseconds has a distance of
A)20 pc
B)50 pc
C)2.0 light years
D)4 kpc
E)Need more information (magnitudes)

Name: A star with a trigonometric parallax of .02 arcseconds has a distance of A)20 pc B)50 pc C)2.0 light years D)4 kpc E)Need more information (magnitudes)
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Question

Quizplus · Accepted Answer

The formula for calculating distance in parsecs (pc) from trigonometric parallax (p) in arcseconds is: 
distance (in pc) = 1/p (in arcseconds)
Therefore, distance = 1/0.02 = 50 pc.

A Star with a Trigonometric Parallax of