| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
Hyperion-N00078277.jpgTumbling Hyperion (1 - natural colors, elab. Lunexit)57 visiteCaption NASA:"N00078277.jpg was taken on February 16, 2007 and received on Earth February 17, 2007. The camera was pointing toward Hyperion that, at the time, was approximately 214.446 Km away.
The image was taken using the P60 and GRN filters". MareKromiumFeb 18, 2007
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Hyperion-N00078297.jpgTumbling Hyperion (2 - natural colors, elab. Lunexit)59 visiteCaption NASA:"N00078297.jpg was taken on February 15, 2007 and received on Earth February 17, 2007. The camera was pointing toward Hyperion that, at the time, was approximately 224.256 Km away.
The image was taken using the CL1 and UV3 filters".MareKromiumFeb 18, 2007
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Rhea-PIA08871.jpgRhea (natural & false colors)88 visiteSide-by-side natural color and false-color views highlight the wispy terrain on Rhea's Trailing Hemisphere. The extreme false color image makes it clear that the wisps - likely networks of fractures as on Dione - cut across older, cratered terrain.
In addition, a set of thin, North-South trending lineaments (also likely fractures) is visible on the left side of both views.
The natural color view was created by compositing images taken using red, green and blue spectral filters.
To create the false-color view, ultraviolet, green and infrared images were combined into a single picture that isolates and maps regional color differences. This "color map" was then superimposed over a clear-filter image that preserves the relative brightness across the body.
The combination of color map and brightness image shows how colors vary across the surface of Rhea. The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy surface material. North on Rhea (1,528 kilometers, or 949 miles across) is up.
The images were taken with the Cassini spacecraft narrow-angle camera on Jan. 17, 2007 at a distance of approximately 597,000 kilometers (371,000 miles) from Rhea. Image scale is 4 kilometers (2 miles) per pixel.
Feb 17, 2007
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Wispy_Star-PIA08875.jpgTwinkle, twinkle, Little Star...66 visiteCaption NASA:"The Cassini spacecraft gazes toward a distant star as Saturn's Rings slip past in the foreground. At upper left is the outer A-Ring, with its dark Keeler Gap. At lower right, a train of bright clumps shuttles past in the wispy F-Ring.
A temporal sequence of images like this allows Cassini scientists to correlate features in the rings with stellar occultation data acquired by other instruments. As the star passes behind the Rings, the changes in its brightness indicate how much empty space is between particles at different locations on the Rings.
This view looks toward the lit side of the Rings from about 56° below the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 30, 2006 at a distance of approx. 633.440 Km (such as about 393.686 miles) from Saturn. Image scale is roughly 4 Km (2 miles) per pixel".Feb 06, 2007
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Mimas-N00077787.jpgOccultation? (6)59 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.344.455 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077788.jpgOccultation? (7)57 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.344.230 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077789.jpgOccultation? (8)58 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.344.003 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077782.jpgOccultation? (1)58 visiteLa cosa più semplice da dire in sede di interpretazione di questo frame è che si dovrebbe trattare di una - davvero splendida - "occultazione", ossìa del transito di un Corpo Celeste sulla medesima linea visuale in cui si trova Mimas (dal punto di vista della Sonda Cassini) ed il susseguente verificarsi di una mini-eclisse.
Ma che cos'è il Corpo Celeste che viene "occultato" da Mimas? E' una stella? Secondo noi no, poichè le stelle, anche adoperando elevatissimi detail mgnf, non vengono risolte in maniera tale da mostrare dei dettagli superficiali.
Questo oggetto, invece, anche senza usare uno stretch eccessivo, si risolve in un disco e "sembra" evidenziare lievi/tenui dettagli superficiali.
Si tratta dunque di un Corpo Celeste molto più vicino all'Osservatore di quanto non lo sarebbe una stella. Che cosa sarà?
Con ogni probabilità, si tratta di un altra Luna Saturniana che, come già è accaduto tante volte in passato, viene colta in transito ravvicinato (un transito ravvicinato, come ovvio, solo apparente e determinato dal particolare movimento e relativo angolo visuale di Cassini) presso un'altra Luna del Gigante Anellato (pensate al bellissimo passaggio ravvicinato - con relativa occultazione - fra Rhea e Dione).
Oppure, se volete, si può anche pensare a qualcosa di più "esotico"...Vedete Voi!
Caption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.345.535 Km away. and the image was taken using the CL1 and CL2 filters (...)". Feb 05, 2007
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Mimas-N00077783.jpgOccultation? (2)58 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.345.325 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077784.jpgOccultation? (3)66 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.345.112 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077785.jpgOccultation? (4)57 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.344.896 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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Mimas-N00077786.jpgOccultation? (5)58 visiteCaption NASA:"(...) The camera was pointing toward Mimas that, at the time, was at approximately 1.344.677 Km away, and the image was taken using the CL1 and CL2 filters (...)".Feb 05, 2007
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