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| Risultati della ricerca nelle immagini - "433" |
0-433-EROS-01.gif433 Eros (GIF-Movie; credits: Dr G. Barca)98 visiteIn questi giorni, dopo anni di silenzio, abbiamo parlato del bizzarro (se non altro nelle sue forme...) asteroide noto come 433-Eros.
Sono bastate poche, ma ragionate, parole ed immagini per capire quanta ignoranza e quanta disinformazione caratterizzi il nostro Mondo: il Mondo dei Ricercatori nel Campo delle Scienze Planetarie e delle Analisi su Fenomeni (cosiddetti) "di Confine".
La Missione NEAR-Shoemaker, quando si svolse (sostanzialmente nel silenzio dei media - come sempre...), ci lasciò affascinati e sorpresi.
Affascinati, perchè l'Universo "affascina", per definizione.
Sopresi, perchè per noi, Anomaly Hunters, l'asteroide 433-Eros sembrò rivelarsi - ictu oculi - come una "fucina di Anomalìe".
Ma il tempo passa: si cresce, ci si sviluppa, si migliora (di solito ed auspicabilmente, almeno). E con il passare del tempo, il nostro entusiasmo - relativo alle Anomalìe di 433-Eros - si è spento.
Si è spento perchè, di "Anomalìe VERE", su quell'Asteroide, siamo arrivati a verificare - e quindi a convincerci razionalmente - che non ce ne sono.
Ma non tutti la pensano come noi. E questo è giusto.
Che fare, allora? Semplice: essendo la nostra Associazione una Associazione che ha per fine, in fondo, la Divulgazione del Sapere, abbiamo deciso di creare un Album il quale fosse integralmente dedicato a questo Asteroide e che contenesse - come da titolo - "le immagini, i fatti e le leggende".
In quello che vedrete e leggerete non c'è pretesa di Verità Assoluta, questo è evidente, ma non c'è neppure l'arroganza di dire "le cose stanno così, e chi non crede a quello che diciamo noi, o è un incompetente o un idiota". Tertium non datur.
Questo Album è dedicato, oltre che all'asteroide 433-Eros, a TUTTI coloro che coltivano la Pianta del Sapere, agendo nella quieta consapevolezza che il Giardino in cui essa "cresce" è di tutti, e nella certezza che la capacità di trarre nutrimento e giovamento dai suoi "frutti" (qualora ne nascano) è tuttavia un fatto assolutamente personale e dagli effetti imprevedibili...MareKromium
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19981105.jpgThe "First Image" of Eros54 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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19981223.jpgViews of 433-Eros54 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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19990108.jpg433-Eros55 visiteThis pair of images of the Asteroid 433-Eros was acquired by the Near Earth Asteroid Rendezvous (NEAR) Spacecraft on December 23, 1998, as the Spacecraft flew by the night side of the Asteroid at a distance of about 2300 miles (approx. 3800 Km) at 13:43 EST. These views, taken at 13:44 and 14:05 EST, as the Spacecraft range increased from 2300 miles to 2500 miles (about 4100 Km), show only a tiny portion of the day side of Eros (Phase Angle ~119°).
The smallest resolved detail in this frame is approximately 1300 feet (400 meters) across. MareKromium
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20000214g.jpgNEAR's historic first image from Eros orbit (natural colors; credits: Lunexit)54 visiteOn February 14, 2000, at 10:33 AM EST the NEAR Spacecraft was successfully inserted into orbit around 433 Eros, becoming the first artificial satellite of an asteroid. Just over an hour later, NEAR pointed its camera at the asteroid and took this picture from a range of 210 miles (330 km) above the surface.
Mission navigators and operators will use this image and others to be taken later to traingulate on landmarks on the asteroid's surface, precisely measuring position of the spacecraft to plot NEAR's course.
Features as small as a 100 feet (30 meters) across can be seen. This view shows the 3-mile (5-Km) impact crater which the Spacecraft has spied for over a week during its approach. The two smaller craters superimposed on its rim are each about 1,2 miles (approx. 2 Km) across. An enormous boulder a full 170 feet (50 meters) in size sits on the large crater's floor. Other key features of the surface are shallow subsurface layering exposed near the tops of crater walls, and shallow grooves crossing the surface and cutting the crater's rim.
(Mosaic of images 0125957025 and 0125957087)MareKromium
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20000217a-PCF-LXTT-IPF.jpgOrbiting 433-Eros (Absolute Natural Colors; credits for the additional process. and color: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)147 visiteCaption NASA:"This picture of 433-Eros, the first of an Asteroid taken from an orbiting spacecraft, is a mosaic of 4 images obtained by NEAR on February 14, 2000, immediately after the Spacecraft's insertion into orbit. We are looking down over the North Pole of Eros at one of the largest craters on the surface, which measures 4 miles (about 6 Km) across. Inside the crater walls are subtle variations in brightness that hint at some layering of the rock in which the crater formed. Narrow grooves that run parallel to the long axis of Eros cut through the South-Eastern part of the crater rim. A house-sized boulder is present near the floor of the crater; it appears to have rolled down the bowl-shaped crater wall. A large number of boulders is also present on other parts of the Asteroid's surface. The surface of the Asteroid is heavily cratered, indicating that 433-Eros is relatively old.
(Mosaic of images 0125956839, 0125957025, 0125957087, 0125957273)MareKromium
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20000217b.jpgOver Eros' horizon (natural colors; credits: Lunexit)54 visiteThis incredible picture of Eros, taken on February 14, 2000, shows the view looking from one end of the asteroid across the gouge on its underside and toward the opposite end. In this mosaic, constructed from two images taken after the NEAR Spacecraft was inserted into orbit, features as small as 120 feet (35 meters) across can be seen.
House-sized boulders are present in several places; one lies on the edge of the giant crater separating the two ends of the asteroid. A bright patch is visible on the asteroid in the top left-hand part of this image, and shallow troughs can be see just below this patch.
The troughs run parallel to the asteroid's long dimension.
(Mosaic of images 0125971425, 0125971487)MareKromium
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20000217c.jpg433-Eros From orbit: the Giant Gouge (natural colors; credits: Lunexit)53 visiteThis picture was taken from NEAR on February 15, 2000, while the Spacecraft was passing directly over the large gouge that creates Eros's characteristic peanut shape.
It is a mosaic of individual images showing features as small as 120 feet (35 meters) across. Although most of the asteroid is in shadow, we are able to see inside the gouge. Many narrow parallel troughs closely follow the shape of the gouge. Although they appear curvilinear from this view, they are most likely oriented parallel to the length of the asteroid.
The strong lighting contrast along the terminator (the line separating day from night on Eros) makes it easy to see that most of the surface is saturated with impact craters. Inside the gouge, however, only smaller craters are present, indicating that the area within the gouge is younger than the surface along the terminator.
This implies that the event that caused the gouge must have happened more recently than the formation of the rest of the surface of Eros.
(Mosaic of images 0126023473, 0126023535, 0126023721, 0126023783, 0126023845, 0126023907, 0126024093, 0126024155)MareKromium
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20000222.jpg53 visiteThis image mosaic of Eros was taken by the NEAR Spacecraft on Feb. 18, 2000 from a range of 224 miles (about 361 Km). The smallest detail visible on the surface is about 115 feet (35 meters) across.
At the time the Spacecraft was over the shadowed Southern Hemisphere, looking North at a crescent Eros.
Although this view of Eros is similar to others that have been returned, the coverage at different illumination and viewing geometries provides important information on the shapes of landforms.
(Mosaic of images 0126286145, 0126286419, 0126286483)MareKromium
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20000225.jpgThe "Two Faces" of Eros... (natural colors; credits: Lunexit)53 visiteOn February 23, 2000, the NEAR spacecraft obtained a sequence of image mosaics showing Eros' surface as the asteroid rotated under the Spacecraft. At that time the range to the surface was approx. 355 Km (about 220 miles). These two mosaics, part of that sequence, show the stark beauty of the two opposite hemispheres.
The smallest detail visible is 35 meters (120 feet) across. The top mosaic shows wavy brightness banding exposed in the interior walls of the Saddle. In the bottom mosaic, similar banding is visible in one of the craters near the limb at left. To the right, the angle of the illumination accentuates the quasi-linear troughs near the Terminator.
Successful firing of NEAR's thrusters yesterday, February 24, placed the Spacecraft on course for insertion into the next lower orbit, at a 200 Km (about 120 miles) altitude. Images from that orbit, commencing in early March, will have nearly twice the spatial resolution of data returned so far.
(Product compiled from images 0126712790, 0126713054, 0126713230, 0126723526, 0126723790, 0126723878)
MareKromium
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20000301.jpgThe "Profile" of 433-Eros (natural colors; credits: Lunexit)53 visiteNEAR takes several images mosaics of 433-Eros daily for purposes of navigating the Spacecraft. The one shown here was taken February 29, 2000, from a range of 289 Km (about 180 miles).
It shows features as small as 30 meters (100 feet) across. All of the mosaics show the same territory over and over, but changes in lighting plus the gradual decrease in the spacecraft's range to the surface are both constantly bringing out new details.
The very oblique illumination in this mosaic is ideal for bringing out small landforms. Many parts of the asteroid have "grooves", such as linear troughs about 100 meters (330 feet) wide and several kilometers long. Similar features have also been observed on other asteroids such as Gaspra, and they are especially numerous on Mars' moon Phobos.
Their origin isn't completely understood, but formation of the grooves probably involves fracturing of the asteroid's subsurface in some way.
(Mosaic of images 0127210446, 0127210510, 0127210574, 0127210656)MareKromium
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20000306.jpgLarge Crater (natural colors; credits: Lunexit)54 visiteThis image mosaic of the "Large Crater" at Eros' center was taken on March 3, 2000, during an optical navigation imaging sequence from a range of 127 miles (about 204 Km). This same area was imaged following orbit insertion at a range of approx. 210 miles (about 330 Km) on February 14th (Feb 14 G).
This picture resolves features as small as 65 feet (20 meters) across compared to the resolution of 100 feet (30 meters) in the earlier image. The shadow cast by the boulder near the floor of the crater is now visible. The walls of the crater display some distinctive variations in their albedo or reflectivity. The upper part of the walls tend to be bright, while the lower portions of the walls and the crater floor show patches of darker or less reflective materials. These albedo patterns are also visible on other crater walls. To the right of the large crater, two sets of closely spaced orthogonal grooves are visible.
(Mosaic of images 0127531846, 0127531908, 0127532094, 0127532156)MareKromium
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