| Risultati della ricerca nelle immagini - "Janus" |
Atlas and others-PIA06522_modest.jpgSaturn's Rings + Atlas, Prometheus and Janus75 visiteCaption NASA originale: "Saturn hosts its own miniature solar system with an entourage of more than 30 moons. This image shows Saturn's "A" and "F" Rings, along with 3 of the moons that orbit close to them. From innermost to outermost, tiny Atlas (32 Km across) orbits just outside of the bright "A-Ring" and is seen above center in this view. Prometheus (102 Km across) is visible near lower right. Prometheus and its smaller cohort, Pandora, shepherd the thin, knotted F-Ring. Janus (181 Km across) can be seen near lower left. Janus shares its orbit with the moon Epimetheus. Density waves due to Janus cause some of the bright bands seen in the A-Ring in this image. Prometheus and Atlas also produce waves in the rings, but their wave regions are too narrow to be seen here. The planet's shadow stretches all the way across the main rings in this view. The shadow has an oval shape now but over the next few years it will become more rectangular as the planet orbits the Sun and the angle Sunlight-Rings decreases".
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Atlas, Pandora and Janus-PIA06522_modest.jpgSaturn's Rings + Atlas, Pandora, Prometheus and Janus77 visiteCaption NASA originale: "Saturn hosts its own miniature solar system with an entourage of more than 30 moons. This image shows Saturn's "A" and "F" Rings, along with three of the moons that orbit close to them. From innermost to outermost, tiny Atlas (32 Km across) orbits just outside of the bright "A-Ring" and is seen above center in this view. Prometheus (102 Km across) is visible near lower right. Prometheus and its smaller cohort, Pandora, shepherd the thin, knotted F-Ring. Janus (181 Km across) can be seen near lower left. Janus shares its orbit with the moon Epimetheus. Density waves due to Janus cause some of the bright bands seen in the A-Ring in this image. Prometheus and Atlas also produce waves in the rings, but their wave regions are too narrow to be seen here. The planet's shadow stretches all the way across the main rings in this view. The shadow has an oval shape now but over the next few years it will become more rectangular as the planet orbits the Sun and the angle Sunlight-Rings decreases.
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Enceladus&C.-PIA08182.jpgMoons...53 visiteCaption NASA proginale:"Four of Saturn's many and varied moons crowd this single frame from Cassini.
All of the moons are illuminated by the Sun, which is out of the frame to the right. "Saturnshine", or reflected light from the planet (out of frame to the lower left), partly illuminates three of the moons, such as Tethys (1.071 Km, or 665 miles across, at upper right), Janus (181 Km, or 113 miles across, at lower left) and Epimetheus (116 Km, or 72 miles across, below and left of center).
Enceladus (505 Km, or 314 miles across) is much farther in the distance in this view, and shows merely a slim crescent below center.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 17, 2006, at a distance of approx. 3,7 MKM (such as about 2,3 MMs) from Saturn. The image scale is approx. 27 Km (about 17 miles) per pixel on Tethys, 21 Km (13 miles) per pixel on Enceladus, and 22 Km (14 miles) per pixel on Janus and Epimetheus".
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Epimetheus&Janus-N00043522.jpgJanus and Epimetheus (1)54 visiteN00043522.jpg was taken on November 29, 2005 and received on Earth November 29, 2005. The camera was pointing toward Epimetheus that, at the time, was approximately 1.095.193 Km away, and the image was taken using the CL1 and CL2 filters.
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Epimetheus&Janus-N00043535.jpgJanus and Epimetheus (2)54 visiteN00043535.jpg was taken on November 29, 2005 and received on Earth November 29, 2005. The camera was pointing toward Epimetheus that, at the time, was approximately 1.103.937 Km away, and the image was taken using the CL1 and CL2 filters.
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Epimetheus-N00055513.jpgThe Runners...Again!53 visiteCaption NASA originale:"N00055513.jpg was taken on March 20, 2006 and received on Earth March 20, 2006. The camera was pointing toward Epimetheus that, at the time, was approximately 452.867 Km away.
This image was taken using the CL1 and CL2 filters and it has not been validated or calibrated".
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Epimetheus-PIA08178.jpgThe "Runners"...again!53 visiteJanus and Epimetheus continue to separate, following their orbital swap in January 2006. Until 2010, Janus will remain the innermost of the pair, whose orbits around Saturn are separated by only about 50 Km (such as approx. 31 miles) on average.
Epimetheus appears just right of the bright A-Ring ansa, or edge, while Janus is seen near the upper right. The faint F-Ring extends across the image and Janus appears directly between its near and far edges.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 16, 2006, at a distance of approx. 3,7 MKM (such as about 2,3 MMs) from Saturn. The image scale is approx. 22 Km (about 14 miles) per pixel on both Janus and Epimetheus.
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Janus and Enceladus-PIA08207.jpgJanus and Enceladus53 visiteCaption originale:"Wrinkled and cracked Enceladus hangs in the distance as the pitted ring moon Janus, at right, rounds the outer edge of the F-Ring. Enceladus is remarkable for its actively venting South Polar Region, while Janus is known for its orbital swap with the moon Epimetheus. The bright core of the F-Ring is perhaps 50 Km wide and contains numerous clumps and kinks.
Dimmer, flanking ringlets on either side of the core wind into a tight spiral structure, discovered in Cassini images.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 21, 2006, at a distance of approx. 565.000 Km (such as about 351.000 miles) from Janus; 702.000 Km (about 436.000 miles) from Enceladus and 530.000 Km (approx. 329.000 miles) from Saturn.
Image scale is roughly 3 Km (about 2 miles) per pixel on Janus and approx. 4 Km (a little more than 2 miles) per pixel on Enceladus".
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Janus and Epimetheus-PIA08170.jpgJanus, Epimetheus and the "Orbital Switch"53 visiteCaption NASA originale:"In their orbital ballet, Janus and Epimetheus swap positions every four years - one moon moving closer to Saturn, the other moving farther away. The two recently changed positions (the swap occurring on January 21, 2006), and Janus will remain the innermost of the pair until 2010, when they will switch positions again.
Although the moons appear to be close in the image, they are not. Janus is about 40.000 Km (appx. 25.000 miles) farther away from Cassini than Epimetheus (at left) in this view. In fact, even when they are at their closest, tugging at each other and swapping orbital positions, they are never closer than about 15.000 Km (about 9.000 miles).
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 20, 2006 at a distance of approx. 452.000 Km(about 281.000 miles) from Epimetheus and 492.000 Km (about 306,000 miles) from Janus. The image scale is about 3 Km (appx. 2 miles) per pixel on both moons".
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Janus from Voyager 2.jpgJanus from Voyager 254 visiteGiano, un'altra (fra le tante...) Lune Minori di Saturno.
Ma Voi sapevate chi era Giano, nella Mitologia Romana? Era - ovviamente - una Divinità il cui compito (decisamente delicato) era quello di vegliare sulle "Porte del Paradiso".
Il "Guardiano della Dimora degli Dei", insomma.
Da non dimenticare, infine, il fatto che Gennaio è proprio il mese dell'anno che deve a Giano (Janus) il suo nome.
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Janus&Epimetheus-PIA07699.jpgHigh-Phase in the Darkness: Janus and Epimetheus53 visiteThis close pairing of Janus and Epimetheus shows the 2 moons at "high phase," meaning that only a thin sliver of sunlit terrain is visible on each moon. Portions of each are also lit feebly by reflected light from Saturn.
Janus (181 Km, or about 113 miles across) is at top and Epimetheus (116 Km, or about 72 miles across) is below.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 25, 2005, at a distance of approx. 479.000 Km(roughly 298.000 miles) from Janus and about 455,000 Km (roughly 283.000 miles) from Epimetheus. The image scale is about 3 Km (approx 2 miles) per pixel on both moons.
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Janus&Prometheus-PIA08192.jpgJanus and Prometheus71 visiteSaturn's moons Janus and Prometheus look close enough to touch in this stunningly detailed view.
From just beneath the Ring-Plane, Cassini stares at Janus on the near side of the Rings, and Prometheus on the far side. The image shows that Prometheus is more elongated than Janus.
The view takes in the Cassini Division (about 4800 Km, or approx. 2980 miles wide), from its outer edge to about halfway across its width.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 29, 2006 at a distance of approx. 218.000 Km (such as about 135.000 miles) from Janus and approx. 379.000 Km (such as about 236.000 miles) from Prometheus. Image scale is about 1 Km (roughly 0,6 mile) per pixel on Janus and about 2 Km (a little more than 1 mile) per pixel on Prometheus.
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