Astronomy & space · University
Parallax distance in parsecs · formula reference
Use a positive parallax in arcseconds. Reciprocal inversion of noisy parallaxes needs additional statistical care.
Formula
Use a positive parallax in arcseconds. Reciprocal inversion of noisy parallaxes needs additional statistical care.
d(pc) = 1/p(arcsec)
Worked example
A model star has exact parallax 0.103 arcseconds. Calculate its distance using d=1/p. Round the final result to 4 decimal places if needed. Answer in pc.
Invert the stated parallax: 1/0.103 parsecs. This exercise treats parallax as exact, not as a noisy measurement.
9.7087 pc
Prerequisites and checking
Algebra and the topic definitions. Keep units and rounding consistent. State the model conditions before applying the formula.
Further reading and review references
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