Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types. Defined as the distance at which an object would have a parallax angle of one arcsecond when observed from two points separated by an astronomical unit (AU), the parsec integrates the principles of parallax and baseline observations to unlock the secrets of the cosmos. So for cosmic distances, we switch to whole other types of units: astronomical units, light years and parsecs. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".Ĭonversion calculator for all types of measurement units. The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles). The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry it is the distance at which one astronomical unit (au) subtends an angle of one second of arc. It is approximately equal to the mean distance between the Earth and Sun. We assume you are converting between parsec and astronomical unit. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles. How many parsec in 1 AU The answer is 4.8481367817234E-6. The parsec (symbol pc) is a unit of length used in astronomy. You can do the reverse unit conversion fromĪU to parsec, or enter any two units below: Enter two units to convert From:
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