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What a Shadow!
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Un'ombra davvero imponente (che evidenzia - molto bene! - anche le "penumbral areas") è disegnata sul disco illuminato di Saturno.
Le Original Captions NASA non ci sono di aiuto, anzi: confondono le idee (come leggerete)!
Dunque rivolgiamo il quesito a Voi: di quale Luna Saturniana è l'ombra che vediamo in questo frame?
Buon Lavoro!
W00061084.jpg was taken on November 07, 2009 and received on Earth November 08, 2009. The camera was pointing toward SATURN that, at the time, was approx. 2.059.699 Km away; the image was taken using the CB2 and CL2 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2010.
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W00061082.jpg was taken on November 08, 2009 and received on Earth November 08, 2009. The camera was pointing toward SATURN at approximately 2,239,003 kilometers away, and the image was taken using the CL1 and RED filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2010.
W00061083.jpg was taken on November 08, 2009 and received on Earth November 08, 2009. The camera was pointing toward SATURN at approximately 2,239,102 kilometers away, and the image was taken using the MT2 and IRP0 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2010.
W00061085.jpg was taken on November 08, 2009 and received on Earth November 08, 2009. The camera was pointing toward SATURN at approximately 2,239,203 kilometers away, and the image was taken using the MT2 and IRP90 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2010.
W00061086.jpg was taken on November 08, 2009 and received on Earth November 08, 2009. The camera was pointing toward SATURN at approximately 2,239,204 kilometers away, and the image was taken using the CB2 and IRP90 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2010.
...Perchè la NASA, se non fa un pò di "casino" e non "intorbida un pò le acque"...Non è la NASA! - PCF
Simpatica la NASA: con tutti i numeri che da ci possiamo sempre giocare al lotto!
Nonostante la confusione, io credo che l'ombra sia di Titano (immagine scattata alle 15:55 UTC circa)
Vince 2di7: è l'ombra di Titano.
Buona l'idea di Walt, ma la zona di cui parli è solo una "penumbral region", esaltata dalla deformazione prospettica alla quale l'ombra è soggetta.
Le "Fontane di Encelado" - ed intendo dire le particelle che le formano, ovviamente - proiettano di sicuro un'ombra, ma essa risulterebbe completamente impercettibile da questa distanza (oltre 2 MKM dallo strato più alto delle nuvole di Saturno - ergo la Regione sulla quale l'ombra finisce con l'evidenziarsi).
Per non dire dell'ombra stessa di Encelado, poi, che apparirebbe sensibilmente più minuta di quella di Titano.
Bravi ed un abbraccio! - PCF