El cometa Halley, oficialmente denominado 1P/Halley, es un cometa grande y brillante que orbita alrededor del Sol cada 76 años en promedio, aunque su período orbital puede oscilar entre 74 y 79 años. Es uno de los mejor conocidos y más brillantes de los cometas de "periodo corto" del cinturón de Kuiper. Se le observó por última vez en el año 1986 en las cercanías de la órbita de la tierra, se calcula que la siguiente visita sea en el año 2061; la anterior ocurrió en el año 1910. Aunque existen otros cometas más brillantes, el Halley es el único cometa de ciclo corto que es visible a simple vista, por lo que del mismo existen muchas referencias de sus apariciones, siendo el mejor documentado.
La Misión Giotto proporcionó a los astrónomos la primera visión de la estructura y superficie del Cometa Halley. El coma del mismo se extiende a través de millones de kilómetros en el espacio, aunque su núcleo es relativamente pequeño, estando en unos 15 kilómetros de largo, 8 de ancho y 8 de alto, con una forma de cacahuete. La masa del cometa es bastante baja, de unos 2.2×1014 kg, con una densidad de unos 0.6 g/cm³. Su albedo es de aproximadamente un 4 por ciento, lo que indica que sólo un 4% de la luz recibida es reflejada, más o menos, es el mismo comportamiento que el carbón. Aunque parece muy brillante, y blanco, al ser observado desde la Tierra, el Cometa halley es, sin embargo, un cuerpo negro.Orbita:
VIDEO SOBRE LOS COMETAS Y EL COMETA HALLEY:
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