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PHOE-SOL058-1.jpgThe "Colors" of Mars... - Sol 58 (natural colors; credits: Dr M. Faccin)55 visitenessun commentoMareKromium
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SOL758-1_copia2.jpgLayered Landscape and distant Hills... - Sol 758 (natural colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL819-2.jpgThe "El Dorado Dunefield" - Sol 819 (natural colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL853-2.jpg"...Nel Blu, dipinto di Blu..." - Sol 853 (natural colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL872-1~0.jpgBoulders and Skyline - Sol 872 (natural colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL859-2P202622513EFFAS00P2298R1M1-1.jpg"Lookout Rock", boulders and razor-blades - Sol 859 (natural colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL509-1-MF.jpgColourful Loner - Sol 509 (natural but enhanced colors; credits: Dr M. Faccin)55 visitenessun commentoMareKromium
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SOL962-GB-LXTT.jpgSolar Panels and Circuits - Sol 962 (true colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SOL993-2.jpgRover Tracks and Sulphates - Sol 993 (true colors; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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SPIRIT-FOGGYLANDSCAPE-4-2P140650025EFF6900P2375R1M1_crop-A170R1.jpgHigh TAU (possible True Colors; credits: Lunexit)55 visiteLa "monocromaticità" di Marte, sebbene solo tendenziale, potrebbe effettivamente verificarsi in ipotesi di elevatissima Opacità Atmosferica (AO o "Tau"), e cioè allorchè TUTTA la luce solare in arrivo su una specifica Regione del Pianeta (o sull'intero Pianeta, nell'ipotesi - non rarissima - di Global Dust Storm), si trovasse a dover attraversare uno strato piuttosto denso di micropolveri in sospensione (che sappiamo essere di color arancio/giallo ocra, nelle Regioni Equatoriali e peri-Equatoriali; rosso scuro o addirittura nero, nelle Regioni Vulcaniche e di color bianco/giallastro opaco, alle Alte Latitudini).
Nella nostra ricostruzione, ipotizziamo che la tempesta di sabbia si sia placata, ma l'O.A. risulti ancora sufficientemente elevata da conferire al paesaggio ed al cielo, una tinta gialla opaca, blanda ed uniforme, in accordo al tipo ed al colore delle micropolveri presenti nella Regione di Gusev Crater.
ATTENZIONE: il risultato visivo che potete apprezzare in questo frame è una semplice simulazione basata sulle conseguenze, in tema di luminosità media del paesaggio e di colorazione del medesimo, di una tempesta di sabbia la quale potrebbe occorrere in un'area desertica sabbiosa e rocciosa terrestre.MareKromium
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19981223.jpgViews of 433-Eros55 visiteThis montage of images of the asteroid Eros was assembled from images acquired by the Near Earth Asteroid Rendezvous (NEAR) Spacecraft on December 23, 1998, as the Spacecraft flew by the asteroid at a distance of 2300 miles (3800 Km) at 1:43 PM EST. Shown are nine early views out of 29 that were obtained during the flyby. These images were taken between 10:44 AM and 12:44 PM EST, as the Spacecraft range closed from 7300 miles (such as abou 11.100) Km, to 3300 miles (such as approx. 5300 Km).
During that time, the Asteroid completed nearly half of a rotation. The smallest resolved detail is approximately 1650 feet (500 meters) across.
A firing of the main engine at 17:00, EST, on December 20, 1998, designed to slow the Spacecraft for insertion into orbit around the Asteroid, was aborted by the Spacecraft. Contact with ground controllers was temporarily lost, but was regained at 20:00 EST on December 21, when autonomous Spacecraft safety protocols took over and transmitted a signal to the ground. All spacecraft systems were determined to be healthy and operational.
Within hours, a flyby observation sequence was developed and uploaded to the Spacecraft.
1026 images were acquired by the Multispectral Imager, to determine the size, shape, morphology, rotational state, and color properties of Eros, and to search for small moons.
The Infrared Spectrometer measured spectral properties of the Asteroid to determine what minerals were present, and the Magnetometer searched for a natural Magnetic Field.
Analysis of the Spacecraft radio signal were also used to determine the asteroid's mass and density.
The main engine was fired successfully on January 3, 1999, placing NEAR on-course for a February 2000 rendezvous.
Eros is NEAR's second asteroid encountered. On June 27, 1997, NEAR flew by the Main-Belt Asteroid Mathilde at a range of approx. 1212 Km (750 miles).MareKromium
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19981105.jpgThe "First Image" of Eros55 visiteThis first image of the Asteroid 433 Eros was acquired by the Multispectral Imager on the Near Earth Asteroid Rendezvous (NEAR) Spacecraft on November 5, 1998, at a distance of 2,5 MMS (about 4 MKM) from the Asteroid.
Eros, located at the center of the image and circled, appears against the star background in a single illuminated pixel.
At the time of the image, NEAR was located 200 MMs (about 321 MKM) from Earth, and the radio signal which transmitted the image from the Spacecraft, took nearly 18 minutes to reach Earth.
The image is a part of a 5,3-hour sequence of images that show Eros over one full rotation.
Repeated imaging of Eros through January, 1999, were used to refine knowledge of NEAR's trajectory relative to the Asteroid and to plan firings of the Spacecraft's engines to slow the craft and place it into orbit.
At the time, NEAR was approaching Eros at a rate of 2100 mph (945 meters per second). Three firings of NEAR's engines, which begun on December 20, 1998, slew the Spacecraft velocity relative to the Asteroid to approx. 10 miles per hour (such as 5 meters per second), until the orbit insertion, which occurred on January 10, 1999.MareKromium
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