| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
Rhea&Enceladus-PIA08229.jpgCrescent Moons...58 visiteCaption NASA originale:"Rhea and Enceladus shared the sky just before the smaller moon passed behind its larger, cratered sibling.
This image is part of a "mutual event" series in which one moon passes close to or in front of another. These sequences help scientists refine the orbits of Saturn's moons.
Cratered Rhea is 1.528 Km (about 949 miles) across and presumed to be geologically dead. While much smaller, Enceladus (505 Km, or about 314 miles across) is geologically active today.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on July 4, 2006 at a distance of approx. 1,4 MKM (such as about 800.000 miles) from Rhea and 1,9 MKM (such as about 1,2 MMs) from Enceladus. The view was obtained at a Sun-moon-spacecraft, or phase, angle of about 142°, relative to both moons.
Image scale is 8 roughly Km (about 5 miles) per pixel on Rhea and roughly 11 Km (about 7 miles) on Enceladus".Lug 26, 2006
|
|
Saturn-PIA08227.jpgA shadow's over Saturn!58 visiteCaption NASA originale:"The shadow of Epimetheus, one of Saturn's co-orbital moons, races across the Planet's restless cloud tops. Epimetheus cruises along beyond the orbits of the narrow F-Ring and its shepherd moons.
Farther south on Saturn, the swirls and eddies are obscured by the shadow of the outer A-Ring and its two prominent, moon-containing gaps, Encke (bottom) and Keeler (dim, at the A-Ring edge).
The image was taken with the Cassini spacecraft wide-angle camera using a spectral filter sensitive to wavelengths of infrared light centered at 728 nnmts. The view was obtained on June 30, 2006, from a distance of approximately 335.000 Km (about 208.000 miles) from Saturn.
Image scale is approx. 16 Km (a little less than 10 miles) per pixel".Lug 25, 2006
|
|
Rhea-N00064136.jpgA rough slice of Rhea (2)58 visitenessun commentoLug 25, 2006
|
|
Rhea-N00064131.jpgA rough slice of Rhea (1)59 visitenessun commentoLug 25, 2006
|
|
Tethys-N00064170.jpgThe "White Face" of Tethys57 visitenessun commentoLug 25, 2006
|
|
Tethys-N00064157.jpgCracks and Craters of Tethys (2)59 visitenessun commentoLug 25, 2006
|
|
Tethys-N00064146.jpgCracks and Craters of Tethys (1)56 visitenessun commentoLug 25, 2006
|
|
Dione-N00064207.jpgCrescent Dione77 visiteCaption originale:"N00064207.jpg was taken on July 24, 2006 and was received on Earth on July 24, 2006. The camera was pointing toward Dione that, at the time, was approximately 262.021 Km away.
The image was taken using the P120 and GRN filters".Lug 25, 2006
|
|
Enceladus-PIA08226.jpgThe "Fountains" of Enceladus58 visiteCaption NASA originale:"The ice-jets of Enceladus send particles streaming into space hundreds of kilometers above the South Pole of this spectacularly active moon. Some of the particles escape to form the diffuse E-Ring around Saturn.
This color-coded image was processed to enhance faint signals, making the contours and extent of the fainter, larger-scale component of the plume easier to see.
The bright strip behind and above Enceladus is the E-Ring, in which this intriguing body resides. The small round object at far left is a background star.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 24, 2006 at a distance of approx. 1,9 MKM (sucg as about 1,2 MMs) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 162°. Image scale is about 11 Km (approx. 7 miles) per pixel".Lug 21, 2006
|
|
Mimas-PIA08223.jpgLand of Darkness...58 visiteCaption NASA originale:"The narrow and twisted F-Ring lights up this scene, which features Mimas against the unlit side of Saturn's Ring-Plane.
The F-Ring contains a great deal of fine, icy particles that are quite effective at scattering Sunlight at "high phase" angles.
Mimas (about 397 Km - approx. 247 miles - across) is seen as a mere crescent in the center of this haunting view.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 13, 2006 at a distance of approx. 3,9 MKM (such as about 2,4 MMs) from Mimas and at a Sun-Mimas-spacecraft, or phase, angle of 156°. Image scale is roughly 23 Km (about 15 miles) per pixel".Lug 18, 2006
|
|
Saturn&Friends-PIA08220.jpgOne in the Shadows, one in the Lights58 visiteCaption NASA originale:"The unlit side of the Rings glows with scattered Sunlight as two moons circle giant Saturn. The light reaching Cassini in this view has traveled many paths before being captured.
At left, Mimas (397 Km, or 247 miles across) presents its "Dark Side". Enceladus (505 Km, or 314 miles across), on the Far Side of the Rings, is lit by "Saturnshine," or reflected sunlight coming from the planet. Saturn, in turn, is faintly lit in the south by light reflecting off the Rings.
Saturn's shadow darkens the Rings, tapering off toward the left side of this view.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 11, 2006 at a distance of approx. 3,9 MKM (about 2,5 MMs) from Mimas, 4,3 MKM (approx. 2,7 MMs) from Enceladus and 4,1 MKM (about 2,6 MMs) from Saturn.
Image scale is roughly 25 Km (approx. 16 miles) per pixel on Saturn".Lug 14, 2006
|
|
Enceladus-PIA08217.jpgThe "Sprayer" under the Rings57 visiteCaption originale:"Enceladus blasts its icy spray into space in this unlit-side Ring view that also features a tiny sliver of Rhea.
The South Polar Region of Rhea (dim.: 1.528 Km, or about 949 miles across) peeks out from beneath the Rings to the right of Enceladus (dim.: 505 Km, or about 314 miles across).
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 9, 2006 at a distance of approx. 3,9 MKM (about 2,4 MMs) from Enceladus and 4,6 MKM (such as about 2,9 MMs) from Rhea. The Sun-Enceladus-spacecraft, or phase, angle is 161°. Image scale is about 23 Km (approx. 14 miles) per pixel on Enceladus".Lug 10, 2006
|
|
| 2245 immagini su 188 pagina(e) |
 |
|
|
|
|
102 | |
|
|
|
|
