## Parsec |

Parsec | |
---|---|

A parsec is the distance from the Sun to an | |

General information | |

astronomical units | |

Unit of | |

Symbol | pc |

Conversions | |

1 pc in ... | ... is equal to ... |

| ×10^{16} ~31 |

| ×10^{13} |

| 65×10^{5} 56 |

The **parsec** (symbol: **pc**) is a ^{[1]} which corresponds to 000 648/π ^{12} ^{12} ^{[a]} The nearest star, ^{[2]} Most of the ^{[citation needed]}

The parsec unit was probably first suggested in 1913 by the British ^{[3]} Named as a *par*allax*sec*ond, it was defined to make calculations of astronomical distances from only their raw observational data quick and easy for astronomers. Partly for this reason, it is the unit preferred in

In August 2015, the ^{16} metres (based on the IAU 2012 exact SI definition of the astronomical unit). This corresponds to the small-angle definition of the parsec found in many contemporary astronomical references. 3.085^{[4]}

- history and derivation
- usage and measurement
- distances in parsecs
- volume units
- in popular culture
- see also
- notes
- references
- external links

The parsec is defined as being equal to the length of the longer leg of an extremely elongated imaginary

One of the oldest methods used by astronomers to calculate the distance to a ^{[5]} The first successful published direct measurements of an object at interstellar distances were undertaken by German astronomer ^{[6]}

The parallax of a star is defined as half of the

The use of the parsec as a unit of distance follows naturally from Bessel's method, because the distance in parsecs can be computed simply as the

Though it may have been used before, the term *parsec* was first mentioned in an astronomical publication in 1913. *astron*, but mentioned that * siriometer* and

In the diagram above (not to scale), **S** represents the **E** the **ES** is one astronomical unit (au). The angle **SDE** is one arcsecond (1/3600 of a degree) so by definition **D** is a point in space at a distance of one parsec from the Sun. Through **SD** is calculated as follows:

Because the astronomical unit is defined to be 597870700 ^{[7]} the following can be calculated:

Therefore, 1 parsec | ≈ 264.806247096 astronomical units 206 |

≈ 677581×10^{16} 3.085 | |

≈ 511577 trillion 19.173 | |

≈ 563777 3.261 |

A corollary states that a parsec is also the distance from which a disc one astronomical unit in diameter must be viewed for it to have an **D** and a diameter of the disc on **ES**).

Mathematically, to calculate distance, given obtained angular measurements from instruments in arcseconds, the formula would be:

where θ is the measured angle in arcseconds, Distance_{earth-sun} is a constant (1 AU or 1.5813×10^{−5} ly). The calculated stellar distance will be in the same measurement unit as used in Distance_{earth-sun} (e.g. if Distance_{earth-sun} = 1 AU, unit for Distance_{star} is in astronomical units; if Distance_{earth-sun} = 1.5813×10^{−5} ly, unit for Distance_{star} is in light years).

The length of the parsec used in ^{[8]} (exactly 000 648/π astronomical units) corresponds exactly to that derived using the small-angle calculation. This differs from the classic inverse-

Other Languages

Afrikaans: Parsek

العربية: فرسخ فلكي

aragonés: Pársec

asturianu: Pársec

azərbaycanca: Parsek

বাংলা: পারসেক

беларуская: Парсек

беларуская (тарашкевіца): Парсэк

български: Парсек

bosanski: Parsek

català: Parsec

Чӑвашла: Парçек

čeština: Parsek

dansk: Parsec

Deutsch: Parsec

eesti: Parsek

Ελληνικά: Παρσέκ

español: Pársec

Esperanto: Parseko

euskara: Parsec

فارسی: پارسک

français: Parsec

Gaeilge: Parsoic

galego: Parsec

한국어: 파섹

հայերեն: Պարսեկ

हिन्दी: पारसैक

hrvatski: Parsek

Ido: Parseko

Bahasa Indonesia: Parsec

íslenska: Parsek

italiano: Parsec

עברית: פארסק

ქართული: პარსეკი

қазақша: Парсек

Kiswahili: Parsek

kurdî: Parsek

Кыргызча: Парсек

latviešu: Parseks

Lëtzebuergesch: Parsec

lietuvių: Parsekas

Limburgs: Parsec

magyar: Parszek

македонски: Парсек

മലയാളം: പാർസെക്

मराठी: पार्सेक

Bahasa Melayu: Parsek

မြန်မာဘာသာ: Parsec

Nederlands: Parsec

日本語: パーセク

norsk: Parsec

norsk nynorsk: Parsec

occitan: Parsec

پنجابی: پارسک

Piemontèis: Parsec

polski: Parsek

português: Parsec

română: Parsec

русский: Парсек

саха тыла: Парсек

Scots: Parsec

sicilianu: Parsec

Simple English: Parsec

slovenčina: Parsek

slovenščina: Parsek

српски / srpski: Парсек

srpskohrvatski / српскохрватски: Parsek

suomi: Parsek

svenska: Parsec

Tagalog: Parsec

தமிழ்: புடைநொடி

татарча/tatarça: Парсек

ไทย: พาร์เซก

тоҷикӣ: Парсек

Türkçe: Parsek

українська: Парсек

اردو: پارسک

Tiếng Việt: Parsec

West-Vlams: Parsec

Winaray: Parsec

粵語: 秒差距

中文: 秒差距