| Piú viste - Asteroids and Comets |
LLQ-Itokawa-ST_2482160259_v-2.jpgRectangular Surface Feature on Itokawa? (context frame)60 visiteIl bravissimo Dr Gianluigi Barca ha provato a calarsi nei panni di coloro che cercano Anomalìe di Superficie su tutti i Corpi Celesti sino ad ora esplorati (almeno fotograficamente...) e, come lui stesso immaginava, non gli è stato difficile traovare un dettaglio più che meritevole di interesse: nella cerchiatura color fucsia, infatti, "impressa" (diremmo addirittura "scolpita") sulla parte illuminata e rivolta verso lo Spazio di un picco di discrete dimensioni - il quale, per altro, proietta una splendida e ben definita ombra su una delle poche aree "lisce" di Itokawa - è ben visibile un rilievo a forma rettangolare (decisamente di colore più chiaro rispetto alla struttura alla quale esso accede) con possibile apertura alla base (una sorta di piccolo "hangar", si potrebbe dire).
E' un "segno" di attività NON naturale? E' una svista? E' una Singolarità o un'Anomalìa?
Andiamo a vedere il detail-mgnf preparatoci dal Dr Barca stesso...MareKromium
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Comets-Comet_Hartley_2-EB-LXTT5.jpgComet "Hartley 2" (credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)60 visitenessun commentoMareKromium
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Comets-Comet_ISON-4-10-2013-HST.jpgComet ISON (Hubble Space Telescope's View)60 visiteCaption originale:"Comet C/ISON was imaged with the Hubble Space telescope on April 10, 2013, using the Wide Field Camera 3, when the Comet was 394 million miles from Earth. View larger. Image via NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team".
MareKromium
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DACTYL-PIA00297.jpgAsteroid Dactyl59 visiteThis image is the most detailed picture of the recently discovered natural satellite of asteroid 243 Ida taken by the Galileo Solid-State Imaging camera during its encounter with the asteroid on August 28, 1993. Shuttered through the camera's broadband clear filter as part of a 30-frame mosaic designed to image the asteroid itself, this frame fortuitously captured the previously unknown moon at a range of about 3,900 kilometers (2,400 miles), just over 4 minutes before the spacecraft's closest approach to Ida. Each picture element spans about 39 meters (125 feet) on the surface of the moon. More than a dozen craters larger than 80 meters (250 feet) in diameter are clearly evident, indicating that the moon has suffered numerous collisions from smaller Solar System debris during its history. The larger crater on the terminator is about 300 meters (1,000 feet) across.
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Comets-Wild_2-02.jpgWild 2 - stereo image pair59 visitenessun commento
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Comets-Wild_2-00.jpgApproaching Wild 2 (1)59 visiteCaption NASA originale:"This image was taken during the close approach phase of Stardust's Jan 2, 2004 flyby of comet Wild 2. It is a distant side view of the roughly spherical comet nucleus. One hemisphere is in sunlight and the other is in shadow analogous to a view of the quarter moon. Several large depressed regions can be seen. Comet Wild 2 is about 5 Km (3,1 miles) in diameter".
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EROS-G-TouchDown.jpg433 Eros: 4 years after the "touch-down"!59 visiteCaption da "NASA - Picture of the Day" del 12.02.2005:"On 12 February, 2001, the NEAR-Shoemaker spacecraft gently touched-down on the the surface of Eros - the first ever landing on an asteroid. During the descent, the spacecraft's camera recorded successive images of the diminutive world's surface, revealing fractured boulders, dust filled craters, and a mysterious collapsed channel. The last frame, seen in the above montage at the far left, was taken at a range of 128 meters. Expanded in the inset, it shows surface features a few centimeters across. Stereo experimenter Patrick Vantuyne, constructed this montage from the final images in the landing sequence, carefully identifying the overlapping areas in successive frames. Frames which overlap were taken by the spacecraft from slightly different viewpoints, allowing Vantuyne to construct close-up stereo images of the surface of asteroid 433 Eros".
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Mathilde-PIA02494.jpgMathilde and Eros: C-Type and S-Type59 visiteCaption NASA originale:"In this montage, Mathilde (at left) and Eros (at right) are shown at the same scale, as they were imaged by NEAR Shoemaker from about 1.800 Km on June 27, 1997, and February 12, 2000, respectively. Mathilde is 56 Km across and Eros is 33 Km long and 13 Km wide. However, Mathilde's brightness is greatly exaggerated for viewing purposes - it's actually 6 times darker than Eros, with about the same reflectivity as soot! In a scheme that reflects how asteroids have historically been a topic for astronomy, not geology, they are classified into groups based on their colors as observed through telescopes. The 2 major classes of asteroids are called S-Types and C-Types. S-Types, whose colors are consistent with "stony" or rocky compositions, prevail among asteroids that orbit closer to the Sun than the mid-point of the asteroid belt. Eros and the 2 asteroids encountered briefly by the Galileo spacecraft on its way to Jupiter - Gaspra and Ida - are all S-Types. C-Types like Mathilde have a dark gray color consistent with a "carbonaceous" composition, rich in carbon compounds and other dark materials. They prevail in the outer part of the asteroid belt".
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Tempel1-PIA07881.jpgTempel-1, from Kitt Peak (pseudo-colors)59 visiteCaption NASA originale:"The Kitt Peak National Observatory's 2,1-meter telescope observed comet Tempel 1 on April 11, 2005, when the comet was near its closest approach to the Earth. A pinkish dust jet is visible to the SouthWest, with the broader neutral gas coma surrounding it. North is up, East is to the left and the field of view is about 80.000 Km wide. The Sun was almost directly behind the observer at this time. The red, green and blue bars in the background are stars that moved between the individual images.
This pseudo-color picture was created by combining three black and white images obtained with different filters. The images were obtained with the HB Narrowband Comet Filters, using CN (3870 A - shown in blue), C2 (5140 A - shown in green) and RC (7128 A - shown in red).
The CN and C2 filters capture different gas species (along with the underlying dust) while the RC filter captures just the dust".
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Tempel1-XXX-streakoflight.jpgSpace Fireworks...59 visiteCaption NASA originale:"...In the almost 2 hours of time that elapsed during the imaging of the comet, its position changed against the background stars. When all of the images of the motion are added together, the resulting streak of light is shown in the image above. Starting from the left, the comet was its natural brightness. The streak brightens significantly in the middle, immediately after impact of the probe".
Nota: i primi resoconti sui risultati scientifici dell'esperimento ci dicono che la NASA ha "scoperto" che sulla superficie della cometa Tempel-1 c'era (c'è) uno strato di polvere simile al borotalco, ergo più sottile di quanto ci si aspettasse. Inutile dire che, se messo in questi termini, il significato dell'esperimento va ad esaurirsi in un qualcosa che fa solo sorridere (di imbarazzo).
La realtà è molto più complessa e coinvolge la natura, la struttura e la composizione dei cd. "corpi cometari" in rapporto agli altri "corpi rocciosi" presenti nel Sistema Solare...
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Tempel1-XXXX-ITS_PressRelease2.jpgThe nucleus of comet Tempel-159 visite...e su questi aspetti (critici) dell'esperimento, non abbiamo ancora dati da presentare e commentare.
Dati che, a quanto dice il Prof. R. Hoagland, non verranno MAI (?) resi noti.
Vi suggeriamo, a tal proposito, di leggere il suo nuovo (discutibile, ma comunque interessante) editoriale, pubblicato sul Sito "The Enterprise Mission" e dal titolo "Captain's Blog - Space News & General Commentary by Richard C. Hoagland".
Nota: questa bella immagine del nucleo della cometa è stata ottenuta dai sensori di puntamento dell'Impactor, circa 5 minuti prima dell'urto.
L'impatto, a titolo di curiosità, è avvenuto fra i due piccoli crateri dal bordo scuro che possiamo vedere in basso, quasi a ridosso del margine inferiore del nucleo stesso (o del Polo Sud, se preferite).
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Tempel1-Y.jpgThe South-Pole of Tempel-1 and the impact area59 visiteDa "NASA - Picture of the Day" del 6 Luglio 2005:"This diverse landscape is the surface of comet Temple-1's nucleus as seen by the Deep Impact probe's Impactor Targeting Sensor. Within minutes of recording the rugged view, the landscape had changed dramatically though, as the impactor smashed into the surface near the two large, half kilometer-sized craters at picture center. Indications are that the probe penetrated well below the surface before vaporizing, sending a relatively narrow plume of debris blasting back into space. Researchers are still speculating on the final size of the crater produced by the July 4th comet crash, but material continues to spew from the impact site and has caused the faint comet to brighten significantly. Determining the crater dimensions and analyzing the debris ejected from the comet's interior will provide premier insights into the formation of comet Tempel 1, a primordial chunk of our own Solar System".
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