NASA : Coy Dione

https://www.nasa.gov/image-feature/jpl/pia20514/coy-dione

Dione's lit hemisphere faces away from Cassini's camera, yet the moon's darkened surface features are dimly illuminated in this image, due to Saturnshine.

Although direct sunlight provides the best illumination for imaging, light reflected off of Saturn can do the job as well. In this image, Dione (698 miles or 1,123 kilometers across) is above Saturn's day side, and the moon's night side is faintly illuminated by sunlight reflected off the planet's disk.

This view looks toward the Saturn-facing side of Dione. North on Dione is up and rotated 8 degrees to the right. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Oct. 23, 2016.

The view was obtained at a distance of approximately 313,000 miles (504,000 kilometers) from Dione. Image scale is 1.8 miles (3 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit

 http://saturn.jpl.nasa.gov

 and 

http://www.nasa.gov/cassini.

The Cassini imaging team homepage is at 

http://ciclops.org.

Credit: NASA/JPL-Caltech/Space Science Institute

Last Updated: Jan. 30, 2017

Editor: Tony Greicius

Tags:  Cassini, Dione, Image of the Day, Jet Propulsion Laboratory, Moons, Saturn, Solar System,

NASA

Guillermo Gonzalo Sánchez Achutegui

ayabaca@gmail.com

ayabaca@hotmail.com

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ESA :Global colour mosaic of Dione .- Un mosaico global de Dione en color.............

 http://www.esa.int/spaceinimages/Images/2017/01/Global_colour_mosaic_of_Dione

 http://www.esa.int/esl/ESA_in_your_country/Spain/Un_mosaico_global_de_Dione_en_color                              

 

Global colour mosaic of Dione

Un mosaico global de Dione en color

9 enero 2017

Dione es una luna helada de 1.122 kilómetros de diámetro que gira alrededor de Saturno y que ocupa la 15.ª posición en la lista de los mayores satélites naturales del Sistema Solar. 

Este mosaico global en color, que muestra la sugerente superficie del satélite, se ha generado a partir de imágenes tomadas por la nave internacional Cassini durante sus primeros diez años de exploración del sistema saturniano. 

Quizá lo más sorprendente sea la diferencia en color y brillo entre las mitades izquierda y derecha de la imagen. Corresponden, respectivamente, a los hemisferios anterior y posterior del satélite respecto a la dirección en que este se desplaza por su órbita de 2,7 días alrededor de Saturno. 

Se cree que la capa oscura que se aprecia en el hemisferio posterior se debe a la radiación de magnetosfera saturniana, que hace que los elementos orgánicos de la superficie de esta luna adquieran un aspecto más oscuro y rojizo. 

Las líneas blanquecinas que atraviesan la superficie en color son barrancos de hielo, algunos con varios cientos de metros de altura, fruto de fracturas tectónicas. 

En cambio, el hemisferio anterior se ha visto teñido por el polvo helado del anillo E, que se alimenta de las minúsculas partículas que escapan de la cercana luna Encélado. 

Mientras que Encélado expulsa continuamente al espacio gas y partículas de hielo a través de las fracturas que rodean su polo sur, Dione no parece mostrar actividad en la actualidad, aunque su superficie fracturada apunta a un pasado geológico más activo. 

De hecho, el reciente estudio de un modelo teórico publicado por investigadores independientes sugiere que un océano subterráneo podría rodear el núcleo rocoso del satélite, oculto a unos 100 kilómetros de su maltrecha corteza. 

Este mosaico global fue publicado por primera vez en 2014. La resolución de la imagen es de unos 250 m/píxel. 

Cassini-Huygens es una misión conjunta de la NASA, la ESA y la ASI, la agencia espacial italiana. La misión fue lanzada en 1997, alcanzando el sistema saturniano en 2004, y la sonda Huygens aterrizó en Titán en enero de 2005. En septiembre de este año, la nave Cassini se sumergirá en la atmósfera de Saturno para dar fin a su increíble misión.

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• Title Global colour mosaic of Dione
• Released 09/01/2017 9:00 am
• Copyright NASA/JPL-Caltech/Space Science Institute/Lunar and Planetary Institute
• Description
  Meet Dione, a 1122 km-diameter icy satellite of Saturn and the 15th largest moon in the Solar System.
  This global colour mosaic of the moon’s intriguing surface was produced from images taken by the international Cassini spacecraft during its first 10 years of exploring the Saturn system.
  Perhaps the most striking observation is the difference in colour and brightness between the left and right halves of the image. They correspond to the ‘trailing’ and ‘leading’ hemispheres respectively, in terms of the direction that the moon is travelling along its orbit around Saturn every 2.7 days.
  The dark coating on the trailing hemisphere is thought to be due to radiation from Saturn’s magnetosphere, which causes organic elements in the moon’s surface to become darker and redder in appearance.
  The wispy white streaks that wind through the coloured surface are bright ice cliffs – some several hundred metres high – resulting from tectonic fractures.
  Meanwhile the leading hemisphere has been painted with icy dust from Saturn’s E-ring, which itself is fed by tiny particles ejected from nearby moon Enceladus.
  While Enceladus continuously spews gas and icy particles into space from fractures near its south pole. Dione appears to be quiet at present, but its fractured surface certainly points to a more geologically active past.
  Indeed, a recent theoretical modelling study by independent researchers suggest that there could be an underground ocean surrounding the moon’s rocky core, buried some 100 km beneath its battered shell.
  This global mosaic was first released in 2014. The image resolution is 250 m per pixel.
  The Cassini–Huygens mission is a cooperative project of NASA, ESA and ASI, the Italian space agency. The mission launched in 1997, and arrived in the Saturn system in 2004, with the Huygens probe landing on Titan in January 2005. In September of this year, the Cassini spacecraft will plunge into Saturn’s atmosphere to conclude its incredible mission.
• Id 371526

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RELATED IMAGES   17 December 2004 Dione and Saturn436 Votes: 7 a vuelo              25 November 2004 Dione's criss-crossing streaks423 Votes: 3       Space Science image of the week archive      Space science image gallery Follow us ESA Space Science Image of
http://www.esa.int/spaceinimages/Images/2017/01/Global_colour_mosaic_of_Dione

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Guillermo Gonzalo Sánchez Achutegui
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NASA : A Moon's Contrasts .- Contrastes de la Luna(Satélite) Dione de Saturno...........

http://www.nasa.gov/image-feature/jpl/pia20492/a-moons-contrasts
http://nasasearch.nasa.gov/search?query=dione&affiliate=nasa&utf8=%E2%9C%93

Dione reveals its past via contrasts in this view from NASA's Cassini spacecraft. The features visible here are a mixture of tectonics -- the bright, linear features -- and impact cratering -- the round features, which are spread across the entire surface.

Tectonic features tell the story of how Dione (698 miles or 1,123 kilometers across) has been heated and cooled since its formation, and scientists use those clues to piece together the moon's past. Impact craters are evidence of external debris striking the surface, and thus they tell about the environment in which the moon has existed over its history.

This view looks toward the trailing hemisphere of Dione. North on Dione is up. The image was taken in visible light with the Cassini narrow-angle camera on April 11, 2015.

The view was obtained at a distance of approximately 68,000 miles (110,000 kilometers) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 28 degrees. Image scale is 2,165 feet (660 meters) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit 

http://saturn.jpl.nasa.gov 

and 

http://www.nasa.gov/cassini.

The Cassini imaging team homepage is at 

http://ciclops.org.

Credit: NASA/JPL-Caltech/Space Science Institute

Last Updated: Aug. 22, 2016

Editor: Tony Greicius

Tags:  Cassini, Dione, Image of the Day, Jet Propulsion Laboratory, Moons, Saturn, Solar System,

NASA

Guillermo Gonzalo Sánchez Achutegui

ayabaca@gmail.com

ayabaca@hotmail.com

ayabaca@yahoo.com

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NASA : Not Really Starless at Saturn .- En realidad, no sin estrellas en Saturno

http://www.nasa.gov/image-feature/jpl/not-really-starless-at-saturn

Saturn's main rings, along with its and moons, are much brighter than most stars. As a result, much shorter exposure times (10 milliseconds, in this case) are required to produce an image and not saturate the detectors of the imaging cameras on NASA's Cassini spacecraft. A longer exposure would be required to capture the stars as well. Cassini has captured stars on many occasions, especially when a target moon is in eclipse, and thus darker than normal. For example, see PIA10526 .

Dione (698 miles, 1123 kilometers across) and Epimetheus (70 miles, 113 kilometers across) are seen in this view, above the rings at left and right respectively.

This image looks toward the sunlit side of the rings from about 3 degrees above the ring plane. The image was taken in visible light with the Cassini spacecraft wide-angle camera on April 2, 2016.

The view was obtained at a distance of approximately 257,000 miles (413,000 kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 34  degrees. Image scale is 15 miles (25 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit 

http://saturn.jpl.nasa.gov
 and
http://www.nasa.gov/cassini.
The Cassini imaging team homepage is at
http://ciclops.org.

Last Updated: July 18, 2016

Editor: Martin Perez

Tags:  Cassini, Dione, Image of the Day, Jet Propulsion Laboratory, Moons, Saturn,

NASA
Guillermo Gonzalo Sánchez Achutegui
ayabaca@gmail.com
ayabaca@hotmail.com
ayabaca@yahoo.com
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NASA : Methane Painting .- Pintura de metano en Saturno

Hola amigos: A VUELO DE UN QUINDE EL BLOG., hemos recibido información de la Agencia Espacial NASA, sobre una fotografía captada por el satélite Cassini, sobre la atmósfera del planeta Saturno que parece una pincelada oscura, pero su satélite Dione, sigue intacto.

NASA, nos dice: ¿Por qué se ve Saturno como si hubiera sido pintada con un pincel oscura en esta imagen infrarroja, pero Dione parece intacta? Tal vez un artista con gustos muy específicos en paletas?

La respuesta es el metano. Esta imagen fue tomada en una longitud de onda que es absorbida por el metano. Las áreas oscuras se ven aquí en Saturno son regiones con nubes gruesas, donde la luz tiene que viajar a través de más metano en su camino hacia y de regreso de la atmósfera. Desde Dione (698 millas o 1.123 kilómetros de diámetro) no tiene una atmósfera rica en metano el camino de Saturno hace, no experimentar absorción similares - la luz del sol, simplemente rebota en su superficie helada.

More information.............
http://saturn.jpl.nasa.gov/

Why does Saturn look like it's been painted with a dark brush in this infrared image, but Dione looks untouched? Perhaps an artist with very specific tastes in palettes?

The answer is methane. This image was taken in a wavelength that is absorbed by methane. Dark areas seen here on Saturn are regions with thicker clouds, where light has to travel through more methane on its way into and back out of the atmosphere. Since Dione (698 miles or 1,123 kilometers across) doesn't have an atmosphere rich in methane the way Saturn does, it does not experience similar absorption -- the sunlight simply bounces off its icy surface.

Shadows of the rings are seen cast onto the planet at lower right.

This view looks toward Saturn from the unilluminated side of the rings, about 0.3 degrees below the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on May 27, 2015 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 728 nanometers.

The view was acquired at a distance of approximately 618,000 miles (994,000 kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 84 degrees. Image scale is 37 miles (59 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit

http://saturn.jpl.nasa.gov

or

 http://www.nasa.gov/cassini . The Cassini imaging team homepage is at

http://ciclops.org .

Credit: NASA/JPL-Caltech/Space Science Institute

Last Updated: Sep. 10, 2015

Editor: Tony Greicius

Tags:  Cassini, Dione, Image of the Day, Jet Propulsion Laboratory, Saturn, Solar System,

NASA

Guillermo Gonzalo Sánchez Achutegui

ayabaca@gmail.com

ayabaca@hotmail.com

ayabaca@yahoo.com

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ASTRONOMÍA: Closest Dione Flyby

Hi My Friends: A VUELO DE UN QUINDE EL BLOG., The image was taken in visible light with Cassini's narrow-angle camera during the spacecraft's flyby of Dione on Dec. 12, 2011. This encounter was the spacecraft's closest pass of the moon's surface, but, because this flyby was intended primarily for other Cassini instruments, it did not yield Cassini's best images of the moon. Higher resolution images were obtained during earlier flybys (see PIA07638). Download Image

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Closest Dione Flyby
Flying past Saturn's moon Dione, Cassini captured this view which includes two smaller moons, Epimetheus and Prometheus, near the planet's rings.

The image was taken in visible light with Cassini's narrow-angle camera during the spacecraft's flyby of Dione on Dec. 12, 2011. This encounter was the spacecraft's closest pass of the moon's surface, but, because this flyby was intended primarily for other Cassini instruments, it did not yield Cassini's best images of the moon. Higher resolution images were obtained during earlier flybys (see PIA07638).

Dione (698 miles, or 1,123 kilometers across) is closest to Cassini here and is on the left of the image. Potato-shaped Prometheus (53 miles, or 86 kilometers across) appears above the rings near the center top of the image. Epimetheus (70 miles, or 113 kilometers across) is on the right.

This view looks toward the northern, sunlit side of the rings from less than one degree above the ring plane. The view was acquired at a distance of approximately 67,000 miles (108,000 kilometers) from Dione. Image scale is 2,122 feet (647 meters) per pixel on Dione. Image credit: NASA/JPL-Caltech/Space Science Institute
Guillermo Gonzalo Sánchez Achutegui
ayabaca@gmail.com
ayabaca@hotmail.com
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ASTRONOMÍA: LUCES Y SOMBRAS EN LAS LUNAS (SATÉLITES) DE SATURNO

Hola amigos: A VUELO DE UN QUINDE EL BLOG., la exploración del Planeta Saturno sigue aceleradamente, y justamente la Sonda Espacial Cassini, enviada por la NASA , ha enviado imágenes captadas por un sobrevuelo el 13 de agosto 2010, en donde se puede apreciar los marcados contrastes de la luz y la oscuridad en las diversos satélites o lunas de Saturno. Aquí en la imagen podemos observamos una fotografía de Dione, captada el 13 de agosto por la Sonda Espacial Cassini. Durante este sobrevuelo, la sonda espacial Cassini también captó algunas imágenes de la superficie abollada e irregular de Dione.Fuente: NASA.
Aquí en la imagen podemos observar una muestra sobre las fisuras sobre la superficie del satélite Enceladus, conocidas como Damascus Sulcus.

Aquí en la imagen observamos el Cráter Penélope que está ubicado el Satélite Tetis del Planeta Saturno. Fuente de imagen: NASA.

SONDA ESPACIAL CASSINI: LUCES Y SOMBRAS EN LAS LUNAS DE SATURNO.-

La nave espacial Cassini de la NASA ha enviado las primeras imágenes obtenidas durante el sobrevuelo que la sonda realizó el pasado 13 de Agosto a la luna de Saturno Enceladus, aunque también pasó cerca de Tetis y Dione, momento que también aprovechó para captar imágenes de estas otras lunas del planeta de los anillos. En las imágenes se pueden apreciar los marcados contrastes entre la luz y la oscuridad. Las imágenes todavía están "en bruto" y están comenzando a ser analizadas por los expertos en tierra, pero de momento, podemos destacar las mejores imágenes obtenidas hasta la fecha del cráter Penélope, en la luna helada Tetis. Este cráter, que tiene 150 kilómetros de anchura, es el segundo cráter más grande de Tetis.

Cassini también pasó cerca de Enceladus, y obtuvo varias imágenes de las famosas rayas de tigre en la región del polo sur de Encelado. Estas características, en realidad son fisuras gigantes que arrojan chorros de vapor de agua y cientos de partículas orgánicas de kilómetros de altura hacia el espacio, también conocidas como Damascus Sulcus. Durante el sobrevuelo, también se llevaron a cabo estudios de calor realizados por el espectrómetro infrarrojo de la nave.

NASA.

Guillermo Gonzalo Sánchez Achutegui

ayabaca@hotmail.com

ayabaca@gmail.com

ayabaca@yahoo.com