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Loading contentThe most direct distance measurement: a star's distance in parsecs is the reciprocal of its annual parallax in arcseconds. A parallax of one arcsecond defines one parsec — but no star is that close.
Formula: d = 1 / p
With the default inputs, parallax distance evaluates to 10 pc — 0.1″ → 10 pc. The validator recomputes this against the known value on every build, so the formula is checked, not asserted.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.