| Piú votate - A Tribute To Mars Global Surveyor |
Martian_Eclipse-moc2_msss_3shadow100-00.jpgMOC Views of Martian Solar Eclipses (Original NASA/MGS/MSSS b/w Frame)100 visiteThe shadow of the martian moon, Phobos, has been captured in many recent wide angle camera views of the red planet obtained by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC). Designed to monitor changes in weather and surface conditions, the wide angle cameras are also proving to be a good way to spot the frequent solar eclipses caused by the passage of Phobos between Mars and the Sun.This picture shows three samples of MOC's global image swaths, each in this case with a shadow of Phobos visible (arrow). The first scene (left) was taken on September 1, 1999 and shows the shadow of Phobos cast upon southern Elysium Planitia. The large crater with dark markings on its floor at the lower right corner is Herschel Basin. The second scene shows the shadow of Phobos cast upon northern Lunae Planum on September 8, 1999. Kasei Valles dominates the upper right and the deep chasms of Valles Marineris dominate the lower third of the September 8 image. The picture on the right shows the shadow of Phobos near the giant volcano, Olympus Mons (upper left), on September 25, 1999. Three other major volcanoes are visible from lower-center (Arsia Mons) and right-center (Pavonis Mons) to upper-middle-right (Ascraeus Mons).
(6 voti)
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Phobos-Phobos_Monolith-00.jpgThe "Phobos' Monolith" (CTX Frame)292 visitenessun commento
(36 voti)
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Phobos_from_MGS-002.jpgPhobos from Mars Global Surveyor (3)254 visiteIn tutta onestà noi pensiamo che queste stime siano da prendersi con pesantissimo beneficio d'inventario: la verità è che alcuni tipi di misurazioni possono essere effettuati solo (ed ovviamente) mediante evidenze indirette.
Che il suolo di Phobos sia polveroso è fortemente probabile.
Che esso sia "così tanto" polveroso è solamente un'ipotesi che si fonda sulla velocità di raffreddamento della sua superficie dopo il tramonto del Sole.
(8 voti)
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Martian_Mountains-MGS-01.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)128 visiteCaption originale: "This is a perspective view of the Charitum Montes, the Mountain Range that bounds Southern Argyre Planitia, created by combining red and blue Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle images with topography from the MGS Mars Orbiter Laser Altimeter (MOLA). Carbon dioxide frost coats some of the hills, craters, and mountainsides in this southern springtime image. The picture is located near 57° South Lat. and 43°West Long. North is toward the top, South toward the bottom. Sunlight illuminates the scene from the upper left. The area shown is about 355 Km. A smaller portion of this image was previously released in July 2003 as "Frosty Mountains."
(21 voti)
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Martian_Limb-MGS-E23-00100_limb-00.jpgMartian Limb and Outer Space (Original NASA/MGS/MSSS b/w Frame)160 visitecaption originale: "The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) red and blue wide angle cameras provide daily coverage of the Red Planet "from Limb to Limb." The "Limbs" are the edges of the Planet as seen to the West and East of the spacecraft. Depending on weather conditions, Clouds or Haze can sometimes be seen above the Limb. This picture was taken by the blue camera in December 2002. It is an oblique view looking Westward across heavily Cratered Terrain at High Southern Latitudes. A thin line of Haze, high in the Martian Atmosphere, can be seen above the Planet's Surface. The view of Craters in the foreground is enhanced by the presence of bright, winter-time CO2 Frost. The darkness above the Limb is outer space".
(28 voti)
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Martian_Mountains-MGS-02.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)150 visitenessun commento
(28 voti)
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Martian_Limb-MGS-E23-00100_limb-01.jpgMartian Limb, Clouds, Haze and Outer Space (Original NASA/MGS/MSSS b/w Frame)123 visiteCaption originale:"Mars Global Surveyor orbits the Red Planet 12 times each day. Half of each orbit is spent on the day side of Mars, which is where most Mars Orbiter Camera images are obtained because sunlight is required to illuminate the Surfaces being observed. However, on the night side of Mars, the wide angle cameras can see clouds and hazes above the sunward Martian Limb. This blue wide angle camera image, obtained on the night side of Mars on May 15, 2003, shows Clouds picking up the first sunlight before dawn near 55° North Latitude. The scene is illuminated by sunlight from the right. The Sun is actually on the other side of the Planet and has not yet risen over this Region. The dark area on the left side of the picture is the Martian Surface at night. The dark band on the right side is Outer Space. The bright features just right of center are the Clouds hanging above the Martian Limb over Mars' Northern Plains. North is up and the Spacecraft was moving Southward when the image was acquired".
(32 voti)
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