![]() Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles.Ĭonversion calculator for all types of measurement units. The parsec (symbol pc) is a unit of length used in astronomy. ![]() One parsec 3.0857 10 13 km One Macron one Astron one Sternweite one parsec One light-year 0. The parsec is defined as being equal to the length of the adjacent leg (opposite leg being 1 AU) of an extremely elongated imaginary right triangle in space. The parsec (symbol pc) is a unit of length used in astronomy. A parsec is a unit of distance used by astronomers, which is equivalent to around 3.26163344 light-years. In summary, the parsec has first been used as unit by Kobold, its name coined by Turner, while Kapteyn is probably the first to have defined the absolute magnitude as it is used today. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU". The unit was likely named by a British astronomer, Herbert Hall Turner, who suggested the unit of astronomical measurement in 1913. The nearest star, Proxima Centauri, is about 1.3 parsecs away, while the Milky Way is more than 31,000 parsecs across. 1 metre is equal to 3.2407792700054E-17 parsec, or 6.6845871226706E-12 AU. To be exact, a parsec is a unit of distance that’s equal to 19 trillion miles: 1 parsec 3.26 light-years 19 trillion miles The term parsec is a portmanteau a combination of two words: Parallax and Arcsecond. The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (au), i.e. One parsec is defined as the distance at which one astronomical unit (the average distance between the Earth and Sun) subtends an angle of one arc-second. We assume you are converting between parsec and astronomical unit.You can view more details on each measurement unit: parsec or AU The SI base unit for length is the metre. The distances to stars are so large that astronomers have defined a special unit of distance, the parsec (pc), for use in distance calculations (Reasoning. 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. More information from the unit converter. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles). It is approximately equal to the mean distance between the Earth and Sun. The parsec distance of an object is the reciprocal of its. Parsec to astronomical unit, or enter any two units below: Enter two units to convert From: Definition of parsec : a unit of measure for interstellar space that is equal to 3.26 light-years and is the distance to an object having a parallax of one second as seen from points separated by one astronomical unit. It is defined as the distance at which one astronomical unit subtends an angle of one arcsecond. The distance from the Sun of a body with a parallax angle of 1 arcsecond was thus defined as a unit and, thanks to Turner, named the parsec.You can do the reverse unit conversion from Once the parallax angle is established you can calculate the distance to a star using trigonometry, because we know Earth’s distance from the Sun. The parallax angle is obtained by halving the angular difference in measurements. The parallax angle is found by measuring the parallax motion (or apparent movement of a star relative to stable, more distant stars) when the star is observed from opposite sides of the Sun (an interval of six months on Earth). ![]() Astronomers used trigonometry to calculate the distance to stars long before the term parsec was coined, but the new unit made it easier to conceptualise unfathomable distances.Ī parsec is the distance from the sun to an astronomical object which has a parallax angle of one arcsecond (1/3600 of a degree). Download Parsec Parsec Download Parsec Hosting is available for Windows 10+.
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