Un anno luminal, anque anno de lumine o anno-lumine, es un unitate de longitude, que equala circa 10 billion kilometros (1016 metros, 10 petametros, o circa 6 billion millias). Como definite per le Union Astronomic International (UAI), un anno luminal es le distantia que lumine propaga in un vacuo in 1 Anno Julian. [1]
| Anno luminal |
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| instantia de: unitate de longitude, non-standard unit[*], UCUM derived unit[*], physical constant[*], UCUM constant[*] |
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| Commons: Light-year |
Le anno luminal es frequentemente usate de mesurar distantias a stellas e altere distantias de un scala galaxic, presertim in publicationes nonspecialistic o scientific popular. Le unitate preferite in astrometria es le parsec, proque illo pote esser plus facilemente derivate ab, e comparate con, datos observational. Le parsec es definite como le distantia al qual un objecto appare de mover 1 arcsecunda de parallaxe quando le observator move se 1 unitate astronomic perpendicular al linea de vista al observator, e illo equala approximatemente 3,26 annos luminal.[1]
Valor numeric
Un anno luminal equala:
- exactemente 9.460.730.472.580,8 km (circa 9,5 Pm)
- circa 5.878.625.373.183,608 millias (circa 6 billion millias (Scala breve))
- circa 63.241,1 unitates astronomic
- circa 0,306601 parseces
- exactemente 31.557.600 secundas luminal
Le figuras supra es basate sur un Anno Julian (non anno Gregorian) de exactemente 365,25 dies (cata de exactemente 86.400 SI secundas, 31.557.600 secundas total in 1 anno)[2] e un definite velocitate de lumine de 299.792.458 m/s, ambe includite in le IAU (1976) Systema de Constantes Astronomic, usava postea 1984.[3]
Vide etiam
- Velocitate de lumine
- Secunda luminal
Referentias
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