Astrometría e Historia de la Astronomía

José Gómez Castaño 

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    Dicotomía en Venus. Efecto Schroter

    Después de ver la imagen tomada por Paco Bellido de Venus el pasado día 7, recordé un trabajo en el que participé en 1991 para detectar el efecto Schroter de Venus.





    En aquel entonces las observaciones fueron todas visuales, pero con la aplicación de la CCD a cualquier telescopio, sería mucho más eficaz la determinación del efecto hoy.

    El efecto consiste en la existencia de una diferencia entre la fase observada del planeta y la calculada. Con cualquier pequeño telescopio es posible ver en esta época a Venus como si se tratara de la Luna. Debido a que la órbita del planeta es interior, se pueden observar fases sobre su superficie como ocurre con la luna.

    Debido a las reacciones químicas dentro de la atmósfera venusiana activadas por la radiación solar, se produce una elevación de la capa atmosférica iluminada que introduce una sombra extra sobre la superficie.

    Si se realizan fotografías del planeta y se compara su fase observada con la calculada, se podrá determinar esta diferecia, conocica como efecto Schroter.

    La fase real es el porcentaje de disco planetario iluminado respecto al total. Puede determinarse la fase calculada a partir de las efemérides proporcionadas por MICA del USNO. La Dicotomía llega en el momento en que se alcanza el 50%.

    Estos días es un buen momento para observar el planeta. Animo a cualquiera que tenga un telescopio a pasearse por la superficie nublada de Venus y hacer alguna fotografía de recuerdo.

    2005-11-12 18:31 | Categoría: | 37 Comentarios | Enlace



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