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domingo, 26 de octubre de 2014

NASA : Close Encounters: Comet Siding Spring Seen Next to Mars .- Encuentros: Cometa Siding Spring VISTO Junto a Marte

Hola amigos: A VUELO DE UN QUINDE EL BLOG., la Agencia Espacial NASA, nos informa que le Cometa Siding Spring fue visto junto al planeta Marte; la vista fue captada por NASA’s Hubble Space Telescope; ......
Siding Spring, designado oficialmente cometa C / 2013 A1, hizo su máxima aproximación a Marte a las 2:28 pm EDT el 19 de octubre, a una distancia de aproximadamente 87.000 millas. Eso es alrededor de un tercio de la distancia entre la Tierra y la Luna. En ese momento, el cometa y Marte fueron de 149 millones de kilómetros de la Tierra.......La imagen de un cometa es un compuesto de exposiciones del Hubble tomadas entre el 18 de octubre de 8:06 am a 19 de octubre, 23:17 Hubble tomó una imagen separada de Marte a las 10:37 pm del 18 de octubre........
El Marte y las imágenes del cometa se han añadido para crear una sola imagen para ilustrar la separación angular, o distancia, entre el cometa y Marte en su máximo acercamiento. La separación es de aproximadamente 1,5 minutos de arco, o una vigésima parte del diámetro angular de la Luna Llena. El campo de estrellas de fondo en esta imagen compuesta se sintetiza a partir de datos del telescopio con base en tierra que proporciona el Palomar Digital Sky Survey, que ha sido reprocesado para aproximarse a la resolución del Telescopio Espacial Hubble.....................

This composite NASA Hubble Space Telescope Image captures the positions of comet Siding Spring and Mars in a never-before-seen close passage of a comet by the Red Planet
This composite NASA Hubble Space Telescope Image captures the positions of comet Siding Spring and Mars in a never-before-seen close passage of a comet by the Red Planet, which happened at 2:28 p.m. EDT October 19, 2014.
Image Credit: 
NASA, ESA, PSI, JHU/APL, STScI/AURA
NASA’s Hubble Space Telescope has produced a unique composite image of comet Siding Spring as it made its never-before-seen close passage of a comet by Mars.
Siding Spring, officially designated Comet C/2013 A1, made its closest approach to Mars at 2:28 p.m. EDT on Oct. 19, at a distance of approximately 87,000 miles. That is about one-third of the distance between Earth and the moon. At that time, the comet and Mars were about 149 million miles from Earth.
The comet image is a composite of Hubble exposures taken between Oct. 18, 8:06 a.m. to Oct. 19, 11:17 p.m. Hubble took a separate image of Mars at 10:37 p.m. on Oct. 18.
The Mars and comet images have been added together to create a single picture to illustrate the angular separation, or distance, between the comet and Mars at closest approach. The separation is approximately 1.5 arc minutes, or one-twentieth of the angular diameter of the full moon. The background star field in this composite image is synthesized from ground-based telescope data provided by the Palomar Digital Sky Survey, which has been reprocessed to approximate Hubble’s resolution.
The solid icy comet nucleus is too small to be resolved in the Hubble picture. The comet’s bright coma, a diffuse cloud of dust enshrouding the nucleus, and a dusty tail, are clearly visible.
This is a composite image because a single exposure of the stellar background, comet Siding Spring, and Mars would be problematic. Mars actually is 10,000 times brighter than the comet, so it could not be properly exposed to show detail in the Red Planet. The comet and Mars also were moving with respect to each other and could not be imaged simultaneously in one exposure without one of the objects being motion blurred. Hubble had to be programmed to track on the comet and Mars separately in two different observations.
NASA used its extensive fleet of science assets, particularly those orbiting and roving Mars, to image and study this once-in-a-lifetime comet flyby. In preparation for the comet flyby, NASA maneuvered its Mars Odyssey orbiter, Mars Reconnaissance Orbiter (MRO), and the newest member of the Mars fleet, Mars Atmosphere and Volatile EvolutioN (MAVEN), in order to reduce the risk of impact with high-velocity dust particles coming off the comet.  Other NASA space observatories also joined Hubble in observing the encounter, along with ground-based telescopes on Earth.
Siding Spring is the first comet from our solar system’s Oort Cloud to be studied up close. The Oort Cloud, well beyond the outer-most planets that surround our sun, is a spherical region of icy objects believed to be material left over from the formation of the solar system.
The new composite image was taken with Hubble’s Wide Field Camera 3. To view the image, visit:
 
NASA
Guillermo Gonzalo Sánchez Achutegui
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