Here are some examples of converting parsecs to other units of length: Example conversions of parsec to other units The parsec can also be used in other fields that deal with large distances or angles, such as geodesy, navigation and surveying. The most distant quasar known, ULAS J1342+0928, is about 8.8 Gpc away.The nearest galaxy to ours, Andromeda, is about 780 kpc away.The center of our galaxy, the Milky Way, is about 8 kpc away.The nearest star to the Sun, Proxima Centauri, is about 1.3 pc away.The parsec is mainly used in astronomy and astrophysics, as it is a convenient unit for expressing distances between stars and other celestial objects. To convert other units of length to parsecs, we can use the inverse of these conversion factors: To convert parsecs to other units of length, we can use the following conversion factors: For more distant objects, such as galaxies and quasars, larger units such as kiloparsecs (kpc), megaparsecs (Mpc) and gigaparsecs (Gpc) are used. The parsec is now widely used in astronomy and astrophysics, especially for objects within and around the Milky Way galaxy. Since then, many more stars have been measured for their parallaxes, using various methods such as telescopes, satellites and interferometers. He found that the star had a parallax of 0.314 arcseconds, which corresponds to a distance of about 10.4 parsecs. The first measurement of a stellar parallax was made by Friedrich Bessel in 1838, for the star 61 Cygni. He also suggested using the symbol “pc” for parsec. He coined the term by blending “parallax” and “second”. The concept of the parsec was first proposed by the British astronomer Herbert Hall Turner in 1913, as a convenient unit for expressing stellar distances. This can be illustrated by an imaginary right triangle, where the adjacent side is one au, the opposite side is one parsec, and the angle opposite to the parsec side is one arcsecond. In other words, it is the distance from which the Earth-Sun distance would appear as one arcsecond on the sky. Arcsecond is a unit of angle that is equal to one sixtieth of an arcminute, or one three thousand six hundredth of a degree.Ī parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond. Parallax is the apparent shift in position of an object when viewed from different perspectives. The word parsec is a combination of “parallax” and “arcsecond”, which are terms related to the measurement of angles. One parsec is about 30.9 trillion kilometres or 19.2 trillion miles. It is approximately equal to 3.26 light-years or 206,265 astronomical units (au), which are the average distances from the Earth to the Sun. Parsec: A Unit of LengthĪ parsec is a unit of length that is often used in astronomy to measure the large distances to astronomical objects outside the Solar System. Lightyear (ly) is a unit of Length used in Metric system. Parsec (pc) is a unit of Length used in Metric system.
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