| Piú votate - Mars through the eyes of Soujourner-Pathfinder |
SOU-SOL007-81316_full.jpgYogi on Mars! (in true colors) - Sol 775 visiteOriginal caption:"Color image from the rover with a close-up view of Yogi".
(3 voti)
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SOU-SOL006-81225_full.jpgRocky Panorama (2) - Sol 678 visiteOriginal caption:"An area of very rocky terrain at the Ares Vallis Landing Site, along with the Lander's deflated airbags, were imaged by the IMP before its deployment on Sol 2. The high-contrast objects at lower right are portions of the Lander and its deflated airbags".
(3 voti)
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SOU-SOL006-81204_full.jpgRocky Panorama (1) - Sol 667 visiteUno splendido panorama, con le solite imperfezioni (ma, per fortuna, di rilievo trascurabile questa volta) ed i soliti errori nella fase - riteniamo che sia comunque la più semplice in assoluto - di 'incollaggio' dei diversi frames che poi formeranno la fotografia completa. Molto interessanti alcuni rilievi, alti e squadrati, che sembrano caratterizzare la sommità delle colline che si vedono in lontananza (ma l'ipotesi più probabile è che si tratti di photo-artifacts).
Caption originale:"Mars Pathfinder's forward rover ramp can be seen successfully unfurled in this color image, taken on Sol 3. This ramp was not used for the deploymentof the microrover Sojourner, which occurred at the end of Sol 2. When this image was taken, Sojourner was still latched to one of the lander's petals, waiting for the command sequence that would execute its descent off of the lander's petal. The image helped Pathfinder scientists determine whether to deploy the rover using the forward or backward ramps and the nature of the first rover traverse. The metallic object at the lower part of the image is the lander's low-gain antenna. The square at the end of the ramp is one of the spacecraft's magnetic targets. Dust that accumulates on the magnetic targets will later be examined by Sojourner's Alpha Proton X-Ray Spectrometer instrument for chemical analysis. At center, a lander petal is visible".
(3 voti)
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SOU-SOL005-81095_full.jpgYogi on Mars! - Sol 5112 visiteCaption originale:"In the foreground are the airbags, and to the left are more hypothesized evaportion deposits".
(3 voti)
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SOU-SOL002-80827_full.jpgBig Rock - Sol 1128 visiteOriginal caption:"This image of the Martian surface was taken by the Imager for Mars Pathfinder (IMP) before sunset on July 4 (Sol 1), the spacecraft's first day on Mars. The airbags have been partially retracted, and portions of the petal holding the undeployed rover Sojourner can be seen at lower left. The rock in the center of the image may be a future target for chemical analysis.
The soil in the foreground has been disturbed by the movement of the airbags as they retracted".
Nota: questa immagine, come le due che seguono, è relativa al Sol 1 ma è stata ricevuta sulla Terra durante il Sol 2.
(3 voti)
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SOU-SOL001-80813_full.jpgColor Panorama: Sol 1132 visiteView of martian surface taken by the Imager for Mars Pathfinder (IMP), the camera on board the Mars Pathfinder lander. This image was taken in mid-morning on Mars (2:30 PM Pacific Daylight Time, July 4, 1997). Part of the small rover, Sojourner, is visible on the left side of the picture. The tan cylinder to the right of the rover is one of two rolled-up ramps by which the rover will descend to the ground. The white, billowy material in the center of the picture is part of the airbag system. Many rocks of different shapes and sizes are visible between the lander and the horizon. Two hills are visible on the horizon. The notch on the left side of the leftmost conical hill is an artifact of the processing of this picture.
(3 voti)
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SOU-SOL001-80817_full.jpgColor Panorama: Sol 1133 visiteOriginal caption:"This picture from Mars Pathfinder was taken at 9:30 AM in the martian morning or MLT (such as 14:30 PDT --> Pacific Daylight Time), after the Spacecraft landed on July 4, 1997. The picture shows the Sojourner Rover perched on 1 of 3 solar panels. The (mini)Rover is 65 cm (about 26") long by 18 cm (7") tall; each of its wheels is about 13 cm (5") high. The white material to the left of the front of the Rover is part of the airbag system used to cushion the landing.
Many rocks of different of different sizes can be seen in a background of reddish soil. The landing site is in the mouth of an ancient channel carved by water. The rocks may be primarily flood debris. The horizon is seen towards the top of the picture. The light brown hue of the sky results from suspended dust".
(3 voti)
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SOU-SOL001-80815_full.jpgColor Panorama: Sol 1127 visitePathfinder enters the upper atmosphere of Mars at 10:02 PDT and at a velocity of approx. 26.500 Km/hour and begins the sequence of events that will land the Spacecraft on the surface. From this point on, the only likely signal from the Spacecraft will be the carrier wave, a single frequency radio wave. The shifting frequency of the carrier, know as the "Doppler shift", will provide an indication of the decelerations occurring during entry and parachute deployment. The Spacecraft is also designed to send back a frequency-keyed signal following certain key events (this signal is called a "semaphore"). The semaphore is very weak and is not expected to be received in real time. However, careful analysis after-the-fact of the broad frequency spectrum recording of the radio signal will give the Operations Team considerable information on how events unfolded during the rapid descent to the surface.
Entry, descent and landing (EDL) takes approximately 4,5' and follows the sequence below:
Spacecraft rapidly decelerates in the atmosphere using the heatshield
Parachute deploys
Heat shield separates
Lander releases from backshell, descends on bridle
Radar altimeter returns information on altitude
Airbags inflate
Rocket-assisted deceleration (RAD) engines fire
Bridle cable is cut
(3 voti)
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SOU-SOL001-80808_full.jpgColor Panorama: Sol 1232 visiteUn nuovo "album" per una "vecchia" Missione: il mini-rover Soujourner, la Sonda Patrhfinder (lett.: cerca-percorso) e le loro "visioni", ora a colori (spesso brutti) ed ora in b/n (decisamente molto meglio), di Marte.
Era il 4 Luglio (ma guarda che combinazione...) 1997 quando le prime immagini del Pianeta Rosso (Ares Vallis) incominciarono ad arrivare e si trattò di frames storici poichè, come la NASA stessa ci rammenta "...these images represent Humankind's return to the Red Planet. More than 20 years after the Viking I and II Missions, Pathfinder has landed on Mars!").
Nota: le immagini da guardare e commentare coprono solo 95 Soles: 30 relativi alla "Prime Mission" - e cioè sino al 3 Agosto 1997 - ed il resto per la "Extended mission" - vale a dire sino al 9 Ottobre 1997).
Una Missione breve? Forse si e forse no.
Una Missione interessante? Giudicatelo Voi!...
(3 voti)
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SOU-SOL065-NASA.jpgMoe and Half Dome - Sol 65 (natural colors; credits: Lunexit)56 visitenessun commentoMareKromium
(2 voti)
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SOU-SOL003-A.jpg"Twin Peaks" and Soujourner-Pathfinder (natural colors)71 visiteUn'immagine che poteva essere bellissima ma che invece si risolve in un (grande) campionario di abrasioni, difetti (più o meno voluti) di "cucitura" tra i diversi frames che formano il panorama, sfuocature inspiegabili e colorazioni, in alcune zone, del tutto improbabili.
Peccato...
(2 voti)
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SOU-SOL039-1.jpgSagan Memorial Station - Sol 3979 visiteCaption NASA originale:"This is one of the best images of the Sagan Memorial Station taken by the Soujourner Rover. Looking out from the Rock Garden, the Camera Mast and High Gain Antenna can clearly be seen above the American flag and the Jet Propulsion Laboratory logo".
(2 voti)
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