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The moon Janus (179 kilometers, 111 miles across) is on the lower left of this image. Epimetheus (113 kilometers, 70 miles across) appears near the middle bottom. Pandora (81 kilometers, 50 miles across) orbits outside the rings on the right of the image. The small moon Atlas (30 kilometers, 19 miles
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With no enhancement, the rings would be essentially invisible in this mosaic. To improve their visibility, the dark (right) half of the rings has been brightened relative to the brighter (left) half by a factor of three, and then the whole ring system has been brightened by a factor of 20 relative to
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At this time so close to equinox, illumination of the rings by sunlight reflected off the planet vastly dominates any meager sunlight falling on the rings. Hence, the half of the rings on the left illuminated by planetshine is, before processing, much brighter than the half of the rings on the right.
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The novel illumination geometry that accompanies equinox lowers the sun’s angle to the ring plane, significantly darkens the rings, and causes out-of-plane structures to look anomalously bright and to cast shadows across the rings. These scenes are possible only during the few months before and after
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The images comprising the mosaic, taken over about eight hours, were extensively processed before being joined together. First, each was re-projected into the same viewing geometry and then digitally processed to make the image “joints” seamless and to remove lens flares, radially extended bright
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The images were taken on Aug. 12, 2009, beginning about 1.25 days after exact equinox, using the red, green and blue spectral filters of the wide angle camera and were combined to create this natural color view. The images were obtained at a distance of approximately 847,000 kilometers (526,000
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Saturn’s equinox which occurs only once in about 15 Earth years. Before and after equinox, Cassini’s cameras have spotted not only the predictable shadows of some of Saturn’s moons (see PIA11657), but also the shadows of newly revealed vertical structures in the rings themselves (see PIA11665).
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Seen from our planet, the view of Saturn’s rings during equinox is extremely foreshortened and limited. But in orbit around Saturn, Cassini had no such problems. From 20 degrees above the ring plane, Cassini’s wide angle camera shot 75 exposures in succession for this mosaic showing Saturn, its
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Also at equinox, the shadows of the planet’s expansive rings are compressed into a single, narrow band cast onto the planet as seen in this mosaic. (For an earlier view of the rings’ wide shadows draped high on the northern hemisphere, see PIA09793.)
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Of the countless equinoxes Saturn has seen since the birth of the solar system, this one, captured here in a mosaic of light and dark, is the first witnessed up close by an emissary from Earth … none other than our faithful robotic explorer, Cassini.
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the planet. So the dark half of the rings is 60 times brighter, and the bright half 20 times brighter, than they would have appeared if the entire system, planet included, could have been captured in a single image.
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rings, and a few of its moons a day and a half after exact Saturn equinox, when the sun’s disk was exactly overhead at the planet’s equator.
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miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 74 degrees. Image scale is 50 kilometers (31 miles) per pixel.
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states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."
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This view looks toward the northern side of the rings from about 20 degrees above the ring plane.
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1621:Template:土星
1531:Gergasi gas
1521:Гасовит џин
1436:Raksasa gas
696:14 CFR 1221
538:slovenščina
182:Description
1384:File usage
1022:Dimensions
692:NASA logos
556:українська
493:Nederlands
475:македонски
147:superseded
84:image/jpeg
27:File usage
1393:Gas giant
1330:Jcpag2012
1324:(2.45 MB)
1270:Jcpag2012
1240:Jcpag2012
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1201:(2.14 MB)
1177:Jcpag2012
1171:(1.41 MB)
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1084:Jcpag2012
1078:(1.41 MB)
1019:Thumbnail
1016:Date/Time
931:inception
921:inception
727:See also
683:Warnings:
596:Licensing
529:sicilianu
511:português
340:български
297:A normal
261:Jcpag2012
191:English:
1661:佩吉 (小衛星)
1646:虛構作品中的土星
1496:거대 기체 행성
1354:older 10
1350:newer 10
1348:) View (
1294:(956 KB)
1264:(782 KB)
1234:(956 KB)
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983:older 10
979:newer 10
977:) View (
790:Captions
645:". (See
457:italiano
412:français
289:PIA11667
1426:Gasreus
1033:current
1028:Comment
814:depicts
794:English
690:Use of
520:русский
439:հայերեն
394:español
385:English
376:Deutsch
358:čeština
322:العربية
174:Summary
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1346:oldest
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1300:A2soup
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1656:土星六邊形
1641:氣態巨行星
1631:航海家計畫
1606:土星的卫星
722:STScI
613:false
610:false
403:فارسی
367:dansk
1651:土星日食
1636:土星探測
1616:龍之風暴
1025:User
762:The
742:The
733:and
639:NASA
574:繁體中文
565:简体中文
304:See
234:Date
17:File
1626:大白斑
1611:土星環
1491:태양계
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