Siriómetro

El siriómetro o distancia a Sirio era una unidad de distancias astronómicas creada por el astrónomo William Herschel durante sus estudios de la Vía Láctea.

Herschel la definió como la distancia media a las estrellas de primera magnitud.[1]​ Posteriormente sería definida con más precisión por Hugo von Seeliger como la distancia correspondiente a una paralaje de 0.2" (valor estimado de la paralaje de Sirio en aquella época, aunque más tarde se demostraría erróneo)[2]​ aunque otros astronómos como Carl Charlier prefirieron definirla simplemente como 106 unidades astronómicas.

El siriómetro pasó a ser una unidad en desuso frente a la popularidad del pársec como unidad de distancias astronómicas. Según Gunnar Malmquist,[1]​ uno de los motivos de la popularización del pársec fue precisamente el nombre, según él, más atractivo para otros astrónomos.

Referencias

  1. ↑ a b Malmquist, K. G. (1925). «On the units of distance in stellar astronomy». The Observatory 48: 144-142. 
  2. ↑ Curtis, Heber D. (1926). «A new name for the Unit of distance in stellar astronomy». Popular Astronomy 34: 542. 

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