| Piú viste - Uranus and His Moons |
VH-Juliet-V2.jpgJuliet - Voyager 296 visitenessun commento
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AAA-vg2_2684726.gifFlying over Uranus...96 visiteOriginal caption:"Image of Uranus taken by Voyager 2 about 21 minutes before closest approach. This image, centered at 4° South, 58° West, was taken with the wide angle camera. The frame is approx. 5.300 km from top to bottom and north is at 1:00. (Voyager 2, 26847.26)".
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UMBRIEL-vg2_p29502-B.jpgUmbriel's extremely unusual surface feature: Wunda Crater (HR - detail mgnf)96 visitenessun commento
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AB-Ariel-V2-PIA01534_modest.jpgBright Ariel!94 visiteSe osservata da una certa distanza (come in questa fotografia, ripresa da circa 150.000 Km), Ariel si dimostra essere una Luna decisamente luminosa, in particolar modo in alcune sue aree: a ridosso del Polo Sud ed in prossimità di alcuni dei suoi "Mari". L'elevatissima albedo di queste aree (ben visibili in questo frame) ci fa supporre che si possa trattare di una conseguenza della presenza di ghiaccio il quale, come sapete, assieme alle nuvole (laddove esistono), è causa dell'elevatissima albedo di alcuni corpi celesti (p.e.: Venere, Giove, Saturno ed alcune delle loro Lune maggiori).
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VL-Rosalind-V2.jpgRosalind - Voyager 293 visitenessun commento
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AB-Ariel-vg2_2684535.jpgCrescent Ariel (HR)93 visitenessun commento
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Uranus-2003.jpgGoing, Going, Gone: Hubble captures Uranus's Rings on Edge (1)93 visiteCaption NASA:"This series of images from NASA's HST shows how the Ring System around the distant planet Uranus appears at ever more oblique (shallower) tilts as viewed from Earth - culminating in the Rings being seen edge-on in 3 observing opportunities in 2007. The best of these events appears in the frame n. 3, taken with Hubble's Wide Field Planetary Camera 2 on August 14, 2007.
The "Edge-On Rings" appear as two spikes above and below the Planet. The Rings cannot be seen running fully across the face of the Planet because the bright glare of the planet has been blocked out in the Hubble photo (a small amount of residual glare appears as a fan-shaped image artifact). A much shorter color exposure of the Planet has been photo-composited to show its size and position relative to the Ring-Plane.
Earthbound astronomers only see Uranus Rings' edge every 42 years as the Planet follows a leisurely 84-year orbit about the Sun. However (and hironically), the last time the Rings were tilted Edge-On to Earth, astronomers didn't even know they existed".MareKromium
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VI-Puck-vg2_2683716.jpgPuck (HR)92 visitenessun commento
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VA-UranusRings-1.jpgUranus' Rings: yesterday, today, tomorrow92 visiteThe position of the Rings of Uranus from AD 1965 up to 2028.MareKromium
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UranusfromHST-2.JPGUranus, from HST (Natural, but enhanced, Colors; credits: NASA)92 visitenessun commentoMareKromium
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Titania_s Limb-V2-PIA01978_modest.jpgTitania's limb (3)91 visiteIl bordo di Titania, semi-immerso nell'oscurità, costituisce un target molto suggestivo da ammirare ed inoltre, proprio grazie ai giochi di luce ed ombra che si formano, risulta leggermente più facile percepire - anche se, a volte, in maniera ingannevole - la "profondità" o il "rilievo" di alcuni dettagli superficiali. Guardate, infatti, il bordo superiore di Titania e noterete, ad ore 1 dell'immagine, una chiara protuberanza di forma "conica". Un dettaglio curioso e suggestivo, ancora una volta. Di che cosa si tratta? Forse di una "spire", simile a quelle che abbiamo visto sulla Luna . O forse qualcosa di completamente diverso...
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AB-Ariel-V2-PIA01351.jpgAriel, from 2,52 MKM91 visiteCaption NASA originale:"Distinct bright patches are visible on Ariel, the brightest of Uranus' 5 largest satellites. Voyager 2 obtained this image Jan. 22, 1986, from a distance of 2,52 MKM (1,56 MMs). The clear-filter image, obtained with the narrow-angle camera, shows a resolution of 47 Km (approx. 29 miles). This image shows several distinct bright areas that reflect nearly 45% of the incident sunlight; on average, the satellite displays a reflectivity of about 25-30%. The bright areas are probably fresh water ice, perhaps excavated by impacts. The South Pole of Ariel is slightly off center of the disk in this view. Voyager 2 obtained its best views of the satellite on Jan. 24, 1986 at a closest-approach distance of about 127.000 km (approx. 79.000 mi)".
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