Convert Astronomical Units to Parsecs
Convert Astronomical Units (AU) to Parsecs (pc) instantly and accurately.
Conversion Formula
pc = AU × 4.848136811e-6
About Astronomical Units
An astronomical unit (AU) is the average distance between Earth and the Sun, precisely defined as 149,597,870.7 kilometers. This unit provides a convenient scale for measuring distances within our solar system. Mars orbits at 1.5 AU, Jupiter at 5.2 AU, and Neptune at about 30 AU from the Sun. The dwarf planet Pluto reaches up to 49 AU away. Light takes about 8.3 minutes to travel 1 AU, explaining why we see the Sun as it was 8 minutes ago. The AU is fundamental in astronomy and space exploration.
About Parsecs
A parsec (pc) is approximately 3.26 light years or 30.86 trillion kilometers, defined as the distance at which one astronomical unit subtends an angle of one arcsecond. Despite being less familiar than light years, parsecs are preferred by professional astronomers because they relate directly to stellar parallax measurements - the apparent shift in a star's position as Earth orbits the Sun. Most nearby stars are within a few dozen parsecs, our galaxy is about 30,000 parsecs across, and distant galaxies are measured in millions of parsecs (megaparsecs).
Quick Reference Table
| Astronomical Units (AU) | Parsecs (pc) |
|---|---|
| 1 AU | 4.848 × 10-6 pc |
| 2 AU | 9.696 × 10-6 pc |
| 5 AU | 2.424 × 10-5 pc |
| 10 AU | 4.848 × 10-5 pc |
| 25 AU | 0.000121203 pc |
| 50 AU | 0.000242407 pc |
| 100 AU | 0.000484814 pc |