| Piú viste - Phobos: the "Doomed" Moon |
PHOBOS-Image031-420-20081008-6042-6-src-02-PhobosSeries_H1.jpgApproaching Phobos (natural colors; credits: Lunexit)58 visiteThis image of Phobos was obtained by the Super Resolution Channel (or SRC, a part of the High Resolution Stereo Camera experiment) on board ESA’s Mars Express on 15 September 2008 (orbit 6042).
The distance from the moon’s centre was 3718 km, and the image resolution is 34 m/pixel.
The original image has been corrected for mirror distortion.
MareKromium
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PSP_007769_9010-Stickney-0.jpgStickney Crater (Natural Colors; credits: NASA)57 visiteThe most prominent feature here is the large impact crater Stickney. With a diameter of 9 Km, it is the largest feature on Phobos. A series of grooves and crater chains is obvious on the other parts of the moon.
Although many appear radial to Stickney, previous studies show that the grooves radiate from a different point on Phobos. Hypotheses for their formation vary.
Some scientists believe the grooves and crater chains are related to the formation of Stickney, whereas others think they may have formed from ejecta from impacts on Mars that later collided with Phobos.
The lineated textures on the walls of Stickney and other large craters are landslides formed from materials falling into the crater interiors in the weak Phobos gravity (less than 1/1000th the gravity on Earth).MareKromium
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000-Phobos-Global_Map-ESA.jpgPhobos: Global Map (False Colors)57 visiteCaption ESA:"This mosaic image is composed by 53 pictures obtained by the Super Resolution Channel (or SRC, a part of the High Resolution Stereo Camera experiment) on board ESA’s Mars Express.
The SRC images covered 70% of the moon's surface. The remaining area is filled with 16 images previously obtained by NASA’s Viking mission.
The mean resolution is 12 mt/pixel". MareKromium
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PHOBOS-Image014-412-20081008-5861-6-all_row-PhobosSeries_H1.jpgPhobos' Sequence57 visitenessun commentoMareKromium
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PSP_007769_9010_IRB.jpgPhobos (Natural Colors; credits: NASA)56 visiteHiRISE acquired 2 dramatic views of the Martian moon, Phobos, on 23 March 2008. Observation PSP_007769_9010, acquired at a distance of 6800 Km from Phobos, provides surface detail at 6,8 mt/pixel scale and a object diameter of about 3200 pixels.
The second observation, PSP_007769_9015, providing a closer look at 5800 Km, views the surface at slightly more detail (5,8 mt/pixel with an object diameter of about 4000 pixels).
The 2 images were taken within 10' of each other and show roughly the same features, but from a different angle so that they can be combined to yield a stereo view.
The illuminated part of Phobos visible in the images is about 21 Km across. Images from previous spacecraft have been of smaller pixel scale (for example, Mars Global Surveyor got data at 4 mt/pixel, because this spacecraft came closer to Phobos), but the HiRISE images have greater signal-to-noise, making the new data some of the best ever for Phobos.MareKromium
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Phobos-MEXP-2-h3868_0000_H.jpgPhobos, the "Doomed Moon", from Mars Express (MULTISPECTRUM; credits: Lunexit)56 visiteCaption ESA:"An image of Phobos by the High-Resolution Stereo Camera on board Mars Express taken on January 10, 2007.
The larger and inner of the two Martian Moons is seen here floating just above the Martian Limb. The image has been enhanced slightly to bring out the detail on the moon".
MareKromium
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PHOBOS-Image001-409-20081008-5870-6-nd3-02-PhobosSeries_H1.jpgPhobos, from Mars Express56 visiteThis image was obtained by the High Resolution Stereo Camera (HRSC) on board ESA’s Mars Express on 28 July 2008 (orbit 5870), at a distance of 351 Km from the moon’s centre. The image was taken using the camera’s nadir channel, at a resolution of 14 mt/pixel.
The origin of Phobos is debated. While its density, lower than the density of the Martian Surface rocks, make it appear to belong to "D-Class" Asteroids, the moon appears to share many surface characteristics with the class of carbonaceous "C-Type" asteroids, which suggests it might have been captured from this population.
However, it is difficult to explain either the capture mechanism or the following evolution of its orbit into the Equatorial Plane of Mars.
An alternative hypothesis is that it formed in its present position, and is therefore a remnant from the planetary formation period.MareKromium
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PHOBOS-Image025-417-20081008-5889-6-src-04-PhobosSeries_H1.jpgPhobos' Terminator56 visiteThis image of Phobos’s surface was obtained by the Super Resolution Channel (or SRC, a part of the High Resolution Stereo Camera experiment) on board ESA’s Mars Express on 3 August 2008 (orbit 5889).
The distance from the moon’s centre was approx. 656 Km, and the image resolution is 6 mt/pixel. The original image has been corrected for mirror distortion.MareKromium
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PHOBOS-Image023-417-20081008-5889-6-src-02-PhobosSeries_H1.jpgPhobos' North Polar Regions56 visiteThis image of Phobos’s surface was obtained by the Super Resolution Channel (or SRC, a part of the High Resolution Stereo Camera experiment) on board ESA’s Mars Express on 8 August 2008 (orbit 5908).
The distance from the moon’s centre was approx. 1024 Km, and the image resolution is 9 mt/pixel. The original image has been corrected for mirror distortion.MareKromium
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PHOBOS-Image022-417-20081008-5889-6-src-01-PhobosSeries_H1.jpgStaring at Phobos' Limb56 visiteThis image of Phobos’s was obtained by the Super Resolution Channel (or SRC, a part of the High Resolution Stereo Camera experiment) on board ESA’s Mars Express on 3 August 2008 (orbit 5889).
The distance from the moon’s centre was approx. 656 Km, and the image resolution is 6 mt/pixel. The original image has been corrected for mirror distortion.MareKromium
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Phobos-MEXP-1-h3909_0000_H.jpgPhobos, the "Doomed Moon", from Mars Express (False Colors; credits: Lunexit)55 visiteCaption ESA:"An image of Phobos by the High-Resolution Stereo Camera on board Mars Express taken on January 22, 2007.
The larger and inner of the two Martian Moons is seen here floating just above the Martian Limb. The image has been enhanced slightly to bring out the detail on the moon".MareKromium
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