| Ultimi arrivi - Titan: The "Foggy" Moon |
Titan-Clouds-White_Clouds-Mosaic.jpgTitan from about 340.000 Km58 visiteCaption originale da "NASA - Picture of the Day" del 26 Ottobre 2004:"What are these surface features on Titan? This planet-sized moon of Saturn had much of its south polar surface imaged during an initial flyby by the Saturn-orbiting Cassini spacecraft back in early July. The above image mosaic was digitally stitched together from pictures taken at a very specific color of polarized infrared light, a color not absorbed and little scattered by Titan's methane haze. Visible are light and dark regions that are not yet understood. Surface features as small as 10 Km are resolved from about 340.000 Km away. The white region near Titan's South Pole, left of center, is unusually thick clouds also thought to be composed of methane. Today Cassini will swoop to within 1,500 kilometers above Titan and may return data and images that help humanity better understand this strange world".Ott 26, 2004
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Titan-N00023130.jpgTitan54 visiteDue immagini di Titano, riprese da una distanza di circa 1,5 milioni di Km. Alcune caratteristiche superficiali di Titano incominciano a distinguersi con una certa chiarezza ed il giorno del "contatto" si avvicina. Certo è che, ancora oggi, fra le tante lune di Saturno, Titano, perennemente avvolto in una spessa coltre di nuvole di colore giallastro, sembra essere davvero la più enigmatica. Se la Sonda Huygens sarà fortunata, forse riusciremo a vedere ed a scoprire qualcosa. Titano ci sta aspettando...Ott 25, 2004
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Titan-Atmosphere_and_Haze-00.jpgTitan from approx. 789.000 Km (The "Double Purple Haze")60 visitenessun commentoAgo 10, 2004
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Titan-Crescent-01.jpgTitan from approx. 790.000 Km56 visitenessun commentoLug 29, 2004
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Titan-Crescent-00.jpgTitan from approx. 347.000 Km55 visitenessun commentoLug 28, 2004
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Titan from Voyager.jpgTitan from Voyager 2 (in HR)58 visiteTitan Data and Statistics
Discovered by = Christiaan Huygens
Date of discovery = 1655
Mass (kg) = 1.35e+23
Mass (Earth = 1) = 2.2590e-02
Equatorial radius = 2.575 Km
Equatorial radius (Earth = 1) = 4.0373e-01
Mean density (gm/cm^3) = 1,88
Mean distance from Saturn = 1.221.850 Km
Rotational period (days) = 15,94542
Orbital period (days) = 15,94542
Mean orbital velocity (km/sec) = 5,58
Orbital inclination = 0,33°
Escape velocity (km/sec) = 2,65
Visual geometric albedo = 0,21
Magnitude (Vo) = 8,28
Mean surface temperature = -178°C
Atmospheric pressure (bars) = 1,5Lug 11, 2004
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