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SOL748-Home Plate-PIA02690-2.jpgHome Plate: almost true colors and HR (2) - Sol 748 to 75155 visiteSpirit acquired 246 separate images of this scene using 6 different filters on the PanCam during the Rover's Martian days, or Soles, 748 through 751 (Feb. 9 through Feb. 12, 2006).
The field of view covers 160° of terrain around the rover. This image is an approximately true-color rendering using Pancam's 753-, 535- and 432-nanometer filters. Image-to-image seams have been eliminated from the sky portion of the mosaic to better simulate the vista a person standing on Mars would see.
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SOL748-Home Plate-PIA02690-3.jpgHome Plate: almost true colors and HR (3) - Sol 748 to 75155 visitenessun commento
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SOL782-2R195787639EFFAQ67P1311R0M1.jpgThe "Untouched Land" - Sol 78255 visiteCaption originale:"Right Rear Haz-Cam Non-linearized Full frame EDR acquired on Sol 782 of Spirit's mission to Gusev Crater at approximately 12:27:41 MLT".
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Saturn-N00055391.jpgWhat is rising? (2)55 visiteCaption NASA originale:"N00055391.jpg was taken on March 20, 2006 and received on Earth March 20, 2006. The camera was pointing toward Saturn that, at the time, was approximately 601.921 Km away.
This image was taken using the UV2 and CL2 filters and it has not been validated or calibrated".
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Mimas-N00055602.jpgMimas (1)55 visitenessun commento
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The Rings-GRing-N00055772.jpgN00055772: the motion of Cassini55 visiteData:"N00055772.jpg was taken on March 21, 2006 and received on Earth March 22, 2006. The camera was pointing toward Saturn's G-Ring that, at the time, was approximately 749.522 Km away.
The image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated".
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SOL788-2P196324685EFFAQB6P2397L7M1.jpgA dark outcrop in the distance - Sol 78855 visitenessun commento
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Dione-N00055940.jpgSaturnshine on Dione55 visiteDione è solo al primo quarto, ma il suo lato in ombra ci appare comunque discretamente visibile - come alle volte accade anche alla nostra Luna - grazie alla luce che arriva dall'immenso disco illuminato di Saturno (il "saturnshine", o "chiaro di Saturno").
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Rhea&Dione-N00056088.jpgIn-transit: Dione and Rhea (2)55 visiteSembra strano, ma dopo aver recuperato tutti i frames disponibili del transito Rhea-Dione, la nostra sensazione - dopo aver ricostruito il filmato dell'eclissi - è che ci sia, ad un certo punto (tra i frames 56091 e 56093) un leggero, ma netto, movimento di Cassini il quale sembra suggerire un repentino cambio di rotta della Sonda ed una conseguente modifica - anch'essa leggera, ma ben visibile - della prospettiva. Può anche darsi, tuttavia, che l'effetto "cambio di rotta" possa anche essere derivato dalla combinazione nel movimento dei tre vettori coinvolti (Rhea, Dione e Cassini).
Provate a verificare Voi stessi: i frames disponibili li abbiamo pubblicati tutti.
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Propellers-000-PIA07792.jpgThe "Propellers" of the Rings (1) - HR55 visiteThis collection of 3 Cassini images provides context for understanding the location and scale of some "propeller-shaped features" observed within Saturn's A-Ring.
Careful analysis of the HR images taken by Cassini's cameras as the spacecraft slipped into Saturn orbit revealed the 4 faint, propeller-shaped double-streaks in an otherwise bland part of the mid A-Ring. Imaging scientists believe the "propellers" provide the first direct observation of the dynamical effects of moonlets which are approx. 100 mt (such as about 300 feet) in diameter.
The propeller moonlets represent a so far unseen size-class of particles orbiting within the Rings.
The 2nd panel provides broad context within the Rings, and shows the B-Ring, the Cassini Division, the A-Ring and the F-Ring. Image scale in the radial, or outward from Saturn, direction is about 45 Km (about 28 miles) per pixel; because the Rings are viewed at an angle, the image scale in the longitudinal - or circumferential - direction is several times greater.
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Propellers-001-PIA07792.jpgThe "Propellers" of the Rings (2) - HR55 visiteThis image is a closer view of the A-Ring, showing the radial locations where "Propeller Features" were spotted. The view is approx. 1.800 Km across (such as about 1.100 miles), from top to bottom, and includes a large density wave at the bottom (caused by the moons Janus and Epimetheus), as well as two smaller density waves.
The footprints of the Propellers are between density waves, in bland, quiescent regions of the Ring.
The Propellers appear as double dashes in the two close-up discovery images and they have been circled. The unseen moonlets, each roughly the size of a football field, lie in the center of each structure. These two images were taken during Saturn orbit insertion on July 1, 2004, and are presented here at one-half scale. Resolution in the original images was 52 mt (about 171 feet) per pixel.
The horizontal lines in the image represent electronic noise and do not correspond to any actual Ring features.
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Propellers-002-PIA07790.jpgThe "Propellers" of the Rings (3) - HR55 visiteThe Propellers are about 5 Km (approx. 3 miles) long from tip to tip, and the radial offset (the "leading" dash is slightly closer to Saturn) is about 300 mt (about 1000 feet).
The Propellers structures are unchanged as they orbit around Saturn.
In that way, they are much like the wave pattern that trails after a speedboat as it skims across a smooth lake. Such a pattern is hard to discern in a choppy sea (---> mare increspato). In much the same way, scientists think other effects may be preventing Cassini from seeing the Propellers except in very bland parts of the Rings.
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