| Piú viste - Titan: The "Foggy" Moon |
Titan-W00013655.jpgThe "bright light" is gone54 visiteFrame immediatamente successivo a quello che evidenziava un luce bianca e brillante (8 pixels) negli strati superiori dell'atmosfera di Titano: ora tutto appare "normale". Si trattava dunque di un photoartifact o di un oggetto reale?
Caption originale:"W00013655.jpg was taken on February 27, 2006 and received on Earth February 27, 2006. The camera was pointing toward TITAN at approximately 32.110 Km away, and the image was taken using the CB3 and CL2 filters. This image has not been validated or calibrated".
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Titan-PIA08126.jpgShining through the Rings...54 visiteCaption originale:"Titan's smoggy atmosphere glows brilliantly in scattered Sunlight, creating a thin, gleaming crescent beyond Saturn's Rings. At this slight angle above the Ring-Plane, the thin F-Ring shines brightly. Light from Titan's eastern and western limbs (edges) penetrates the Cassini Division, which looks like a thin gap from this angle.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 18, 2006, at a distance of approx. 1 MKM (such as about 600.000 miles) from Saturn. Planet-sized Titan (5.150 Km, or 3,200 miles across) was 2,2 MKM (about 1,4 MMs) from Cassini at that time. The image scale is 13 Km (8 miles) per pixel on Titan".
Nota: crediamo che sia la prima volta in cui la NASA, nel fornire i dati contingenti sul frame (ivi, in particolare, la distanza Sonda-Oggetto Ripreso), aggiunge la precisazione "...at that time...".
Ci teniamo a sottolineare che questo tipo di precisazione (a nostro parere fondamentale per far capire a tutti i Lettori - e soprattutto ai più giovani - che la "staticità" non appartiene al Cosmo) l'abbiamo introdotta noi, come Lun-Ex-It, in sede di integrazione dei dettati (captions) originali dei frames relativi a Saturno ed al suo Sistema.
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Titan-PIA08157.jpgTitan & Epimetheus54 visiteCaption originale:"This poetic scene shows the giant, smog-enshrouded moon Titan behind Saturn's nearly edge-on Rings.
Much smaller Epimetheus (116 Km - or 72 miles - across) is just visible to the left of Titan (5.150 Km - or 3.200 - miles across).
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 9, 2006, at a distance of approx. 4,1 MKM (such as about 2,5 MMs) from Titan. The image scale is 25 Km (about 16 miles) per pixel on Titan. The brightness of Epimetheus was enhanced for visibility purposes".
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Titan-PIA08167.jpgTitan's foggy Northern "Cap" (Original NASA/JPL/SSI b/w RAW Frame)54 visiteCaption NASA:"The complex and dynamic Atmosphere of Titan displays multiple Haze Layers near the North Pole in this view, which also provides an excellent look at the detached Stratospheric Haze Layer that surrounds the moon at lower Latitudes.
North on Titan is up and rotated 20° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on March 16, 2006, using a filter sensitive to wavelengths of UltraViolet Light centered at 338 nanometers. The image was obtained at a distance of approx. 1,2 MKM (about 800.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 68°. Image scale is approx. 7 Km (such as about 5 miles) per pixel".
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Titan-PIA08219.jpgTitan through the Rings54 visiteCaption NASA originale:"Titan shines beyond the Rings like a brilliant ring of fire, its light gleaming here and there through the gaps in Saturn's magnificent plane of ice. Titan is surrounded by a thick photochemical haze which scatters the Sun's light.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 11, 2006 at a distance of approx. 5,3 MKM (about 3,3 MMs) from Titan and at a Sun-Titan-spacecraft, or phase, angle of 158°. Image scale is roughly 32 Km (about 20 miles) per pixel on Titan".
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Titan-PIA08246.jpgTitan54 visiteCaption NASA:"This remarkably clear view from that flyby shows the moon's characteristically dark Mid-Latitudes, and more Southern Terrain than the Cassini spacecraft has usually been able to glimpse. This was the first in a series of "illuminated outbound flybys" of Titan where the illuminated Hemisphere was visible following the closest approach. Cassini's flyby of Titan on July 22, 2006 sent the spacecraft into a more inclined orbit about Saturn.
The image was taken in polarized infrared light with the Cassini spacecraft wide-angle camera on July 22, 2006 at a distance of approx. 148.000 Km (about 92.000 miles) from Titan.
Image scale is roughly 9 Km (about 5 miles) per pixel".
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Titan-PIA09032.jpgTitanian "Sierras"54 visiteCaption NASA originale"This composite image shows a massive mountain range running just south of Titan's Equator. Near the center of the image, the mountain range runs from South-East to North-West. It is about 150 Km long (approx. 93 miles) and 30 Km (about 19 miles) wide and approx. 1,5 Km (nearly a mile) high.
This range and smaller ranges to the West and East of the main range, probably results from material welling up below as the crust of Titan is pulled apart by tectonic forces.
This image was obtained during an Oct. 25 flyby designed to obtain the highest resolution infrared views of Titan yet. Cassini's VIMS resolved surface features as small as 400 meters (1,300 feet).
This composite image was taken at a distance of about 12.000 Km (7.200 miles) from Titan. This image was constructed from images taken at wavelengths of 1,3 microns shown in blue, 2 microns shown in green and 5 microns shown in red".MareKromium
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Titan-PIA08351.jpgClose "Friends"...54 visiteCaption NASA originale:"Cassini peers around the hazy limb of Titan to spy the sunlit South Pole of Saturn in the distance beyond.
The thick, smog-like atmosphere of frigid Titan is a major source of interest for the Cassini mission. The moon is 5.150 Km (about 3.200 miles) across.
Images taken using red, green and blue spectral filters were combined to create this natural-color view. The image was taken with the Cassini spacecraft narrow-angle camera on Dec. 26, 2005, at a distance of approx. 26.000 Km (about 16.000 miles) from Titan. Image scale is roughly 1 Km (4.643 feet) per pixel".
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Titan-PIA08868.jpgTitanian "Bands"54 visiteCaption NASA:"Titan bears a distinct East-West banded pattern in this Cassini spacecraft image taken in the ultraviolet.
The ultraviolet wavelength allows Cassini to see Titan's stratosphere, where superrotation -- in which the atmosphere moves around the moon faster than Titan rotates -- is strong. The recent appearance of this feature may be a harbinger of seasonal change on Titan.
The moon's halo -- its detached, high-altitude global haze layer -- is visible here as well, and is often its most prominent feature in such ultraviolet views. North on Titan is up and rotated 6° to the right in this image.
The view was obtained by the Cassini spacecraft narrow-angle camera using a spectral filter sensitive to wavelengths of polarized ultraviolet light.
The view was acquired on Dec. 25, 2006 at a distance of approx. 1,3 MKM (about 800.000 miles) from Titan and at a Sun-Titan-spacecraft, or phase, angle of 123°.
Image scale is roughly 8 Km per pixel".
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Titan-PIA08879.jpgTitan (true colors - elab. NASA)54 visiteCaption NASA:"Looking toward high Northern Latitudes on Titan, the Cassini spacecraft spies a banded pattern encircling the Pole.
This sort of feature is what scientists expect to see in the Stratosphere of Titan, where the Atmosphere is superrotating, or moving around the moon faster than the moon itself rotates.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were taken by the Cassini spacecraft wide-angle camera on Jan. 28, 2007 at a distance of approx. 196.000 Km (about 122.000 miles) from Titan. Image scale is 12 Km (approx. 7 miles) per pixel".
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Titan-PIA08943.jpgAn "Orthographic View" of Titan54 visiteCaption NASA:"Cassini acquired this view of Titan on April 13, 2007, following a flyby of the Mercury-sized moon. Titan's equatorial Dark Regions are visible in this view, along with faint, dark lineaments (linear features) in the otherwise bland-looking terrain of the North. Near the Terminator are the dark, lake-like features identified in Cassini flybys early in 2007.
To the east of the lake-like features is a bright patch of clouds that likely consist of a mixture of Methane and Ethane.
This view of Titan is an orthographic reprojection centered on 27,4° North Latitude. An orthographic view is most like the view seen by a distant observer looking through a telescope.
The view was obtained using a filter sensitive to near-infrared light centered at 939 nanometers, allowing for observations of Titan's Surface and Lower Atmosphere, added together. An image taken using a filter sensitive to visible light centered at 619 nanometers was then subtracted from the product, effectively removing the lower atmosphere contribution to the brightness values in the image, increasing image contrast and improving the visibility of surface features.
The Cassini spacecraft acquired this view with its narrow-angle camera at a distance of approx. 1,2 MKM (about 800.000 miles) from Titan. Image scale is roughly 7 Km (such as about 5 miles) per pixel".
MareKromium
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Titan-Surface-00-LS28_PSS_LASoderblom_VIMSRADAR20070323.jpgHuygens Probe Landing Site54 visiteThis image composite shows three different views of the Huygens landing site. The top image was obtained by Cassini’s VIMS instrument in the infrared. The middle one is a mosaic of all the images obtained by the DISR visible camera on board Huygens, and shows surface features. The bottom image was obtained by Cassini’s SAR radar. MareKromium
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