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标题: 卡西尼最近的作品展示 [打印本页]

作者: 夜空 时间: 2006-4-2 23:08
标题: 卡西尼最近的作品展示
以下图片均由：Credit: NASA/JPL/Space Science Institute

The Storm Continues
Released: March 29, 2006

风暴仍在肆虐
发布: 2006 年3月29 日

Cassini looks toward giant Saturn and its moon Tethys, while a large and powerful storm rages in the planet’s southern hemisphere. The storm was observed by Cassini beginning in late Jan. 2006, and was at the time large and bright enough to be seen using modest-sized telescopes on Earth.

卡西尼在观察巨行星土星和它的卫星Tethys时, 正有一个巨大和充满能量的风暴在行星的南半球肆虐。卡西尼从2006 年1月下旬开始一直在观测这个风暴，同时风暴也足够的大和明亮来从地球上用合适大小的望远镜观测到。

The fact that the storm stands out against the subtle banding of Saturn at visible wavelengths suggests that the storm’s cloud tops are relatively high in the atmosphere.

事实上在可看见光波段揭示了由土星上细微条纹衬托出的风暴其云顶比周围的区域显著要高。

Tethys is 1,071 kilometers (665 miles) across.

The image was taken in visible light with the Cassini spacecraft wide-angle camera on Feb. 18, 2006, at a distance of approximately 2.8 million kilometers (1.7 million miles) from Saturn. The image scale is 162 kilometers (101 miles) per pixel on Saturn.

Tethys 横跨土星1,071 公里(665 英哩) 。

图像是卡西尼太空船上的广角照相机于2006年2月18日在距土星大约2.8 百万公里 (1.7 百万英哩)处采用可见光拍摄的。图像精度是在土星上每像素162 公里(101 英哩)。

[ 本帖最后由夜空于 2006-4-5 09:15 PM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:08
Small Moons on the Edge
March 30, 2006

Staring toward the outer edge of Saturn’s main rings, Cassini spots Pandora and tiny Atlas. Several clumps are visible in the narrow F ring, as well as multiple dusty strands flanking the F ring core.

Pandora (84 kilometers, 52 miles across) is seen here outside the F ring, while Atlas (32 kilometers, 20 miles across) is a mere dim pixel just above the bright outer edge of the A ring.

边缘的小卫星
2006 年3月30 日

往土星的主环边缘外凝望, 卡西尼的焦点聚集在Pandora潘多拉[土卫十七]和细小的Atlas（土卫十五）。一些土块可以在狭窄的F环里看到, 就像F环中心边缘的微尘一样多。
Pandora (84 公里, 52 英哩)可以在F 圆环之外看到, 当Atlas（土卫十五）(32 公里, 20 英哩)仅仅是一个在明亮的A环边缘外之上的昏暗点。

[ 本帖最后由夜空于 2006-4-9 08:17 PM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:08
Rhea Beyond the Rings
March 31, 2006

Crater-scarred Rhea floats in the distance, peeking out from behind Saturn’s partly shadowed rings. This view looks upward from just beneath the ringplane. The far side of the rings is masked by Saturn’s shadow.

有许多坑和斑纹的土卫五漂浮在远方，正从土星环外面的阴暗部分窥视着。这景象是从土星环平面稍微下一点往上看到的。光环的较远的一边被土星的阴影遮掩了。

A few bright wispy markings curl around the eastern limb of Rhea (1,528 kilometers, 949 miles across).

一些小而明亮的斑纹缠绕在土卫五的东部。(直径1,528 公里, 949 英里).

[ 本帖最后由夜空于 2006-4-30 10:54 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:08
Structure in the Shadows
Released: March 28, 2006

Shadows drape Saturn’s northern hemisphere, providing a different kind of look at prominent features in the rings. From the lower left corner upward, the visible features are: the shadow of the outer B ring, followed by the wide, bright Cassini Division, then the A ring with the thin, bright Encke Gap and finally the dark, narrow F ring.

The image was taken with the Cassini spacecraft narrow-angle camera on Feb. 18, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nanometers, and at a distance of approximately 2.8 million kilometers (1.7 million miles) from Saturn. The image scale is 16 kilometers (10 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:38 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Sensational Sights Raw Preview #8
Released: March 27, 2006

Cassini continues seeking the plumes of Enceladus in this raw, unprocessed image taken at high phase angle (the Sun-Enceladus-spacecraft angle), which is the best viewing geometry for imaging the icy jets of material.

The image was taken on Mach 24, 2006 with the narrow angle camera from a distance of approximately 1.9 million kilometers (1.2 million miles) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 162 degrees. Resolution in the image is about 11 kilometers (7 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:39 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Against the Current

Released: March 27, 2006

Storm Alley’s latest, greatest resident, the recent lightning-producing storm seen by Cassini and Earth-based observers churns away. Turbulent eddies to the west (left) of the storm indicate that it is moving eastward relative to the westward-flowing winds at this latitude on Saturn.

Scientists gave the nickname “Storm Alley” to the area around 35 degrees south latitude because of the large amount of activity seen there from the beginning of Cassini’s approach to Saturn in early 2004. The region has spawned two large and powerful storms since Cassini began observations.

The image was taken with the Cassini spacecraft narrow-angle camera on Feb. 16, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nanometers, and at a distance of approximately 3.2 million kilometers (2 million miles) from Saturn. The image scale is 19 kilometers (12 miles) per pixel.

与当前相对

胡同风暴的最新、最大的居民,近日闪电生产风暴被卡西尼被和基于地球的观察员频繁观测到.风暴西边(左边)湍急的旋涡,表明它相对于土星这个纬度上西向东吹的风是东向西运动的.

科学家把土星南纬35度周围的地区戏称为"胡同风暴",因为从卡西尼在2004年年初开始接近土星时便一直有大量的活动被观测到.该地区自卡西尼开始观测以来便产生了两个强大和充满能量的风暴.

图像是2006年2月16日卡西尼号飞船的窄视角相机用对红外波段敏感的滤镜在750纳米的红外波段在距离土星约320万公里(200万英里)处拍摄的. 图像分辨率是每象素19公里(12英里).

[ 本帖最后由夜空于 2006-4-30 10:25 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Vortices Abound
Released: March 24, 2006

Saturn’s atmosphere comes alive with a multitude of dark vortices swirling through the southern hemisphere.

Vortices are long-lived features that are part of the general circulation of Saturn’s atmosphere. Vortices are counterparts to the eastward- and westward-flowing jets – the alternating bands flowing past each other in the atmosphere. The vortices can last for months or years and probably grow by merging with other vortices until a few dominate a particular zone of wind shear between two jets.

The vortex at upper right is one of the largest vortices on Saturn.

The image was taken with the Cassini spacecraft narrow-angle camera on Feb. 16, 2006 at a distance of approximately 3.2 million kilometers (2 million miles) from Saturn. The image scale is 19 kilometers (12 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:41 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Saturnian Specters

Ghostly details make this dark scene more than just a beautiful grouping of two moons. In Titan’s thick and distended atmosphere, the detached high haze layer can be seen, as well as the complex northern polar hood (at top). Images like this one can help scientists make definitive estimates of the altitudes to which the high haze extends.

Between Titan and Tethys (horizontally) is the very faint apparition of Saturn’s G ring, just discernable above the level of background noise in the image.

The faint vertical banded pattern here is a type of noise that usually is removed during image processing. Because this image was processed to enhance the visibility of details in Titan's atmosphere and the faint G ring, the vertical noise was also enhanced.

Titan is Saturn’s largest moon, at 5,150 kilometers (3,200 miles) across; Tethys is 1,071 kilometers (665 miles) across.

The view was obtained in visible light with the Cassini spacecraft narrow-angle camera on Jan. 19, 2006, at a distance of approximately 2.4 million kilometers (1.5 million miles) from Titan and 1 million kilometers (600,000 miles) from Tethys. The image scale is 14 kilometers (9 miles) per pixel on Titan and 6 kilometers (4 miles) per pixel on Tethys.

[ 本帖最后由夜猫子于 2006-4-3 12:42 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Sensational Sights Raw Preview #3
Released: March 22, 2006

This unprocessed image was taken on March 21, 2006 and shows Rhea in front of Saturn.

The image was taken with the wide angle camera from a distance of approximately 221,100 kilometers (137,400 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 145 degrees. Resolution in the image is about 13 kilometers (8 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:44 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Sensational Sights Raw Preview #6
Released: March 22, 2006

This unprocessed image was taken on March 21, 2006 and shows Mimas in front of Saturn.

The image was taken with the narrow angle camera from a distance of approximately 190,700 kilometers (118,500 miles) from Mimas and at a Sun-Mimas-spacecraft, or phase, angle of 91 degrees. Resolution in the image is about 1 kilometer (3,729 feet) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:45 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:09
Sensational Sights Raw Preview #2
Released: March 22, 2006

This unprocessed image was taken on March 21, 2006 and shows Janus in front of the rings and Titan beyond.

The image was taken with the narrow angle camera from a distance of approximately 724,500 kilometers (450,200 miles) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 152 degrees. Resolution in the image is about 4 kilometers (3 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:46 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:10
Sensational Sights Raw Preview #7
Released: March 22, 2006

Cassini continues seeking the plumes of Enceladus in this raw, unprocessed image taken at high phase angle (the Sun-Enceladus-spacecraft angle), which is the best viewing geometry for imaging the icy jets of material.

The image was taken with the narrow angle camera from a distance of approximately 1.3037 million kilometers (810,100 miles) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 160 degrees. Resolution in the image is about 8 kilometers (5 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:47 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:10
Where’s Saturn?
Released: March 22, 2006

Cassini captures three moons at once as they hurtle around Saturn. In the background, Saturn’s night side occults the more distant portion of the rings, betraying the presence of the unseen giant.

At left and right respectively, the two smaller moons are Epimetheus (116 kilometers, 72 miles across) and Pandora (84 kilometers, 52 miles across). Larger Mimas (397 kilometers, 247 miles across) lies below.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 16, 2006, at a distance of approximately 3.3 million kilometers (2.1 million miles) from Saturn. The image scale is about 20 kilometers (12 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:48 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:10
Sensational Sights Raw Preview #1
Released: March 22, 2006

This unprocessed image was taken on March 21, 2006 and shows the unlit side of Saturn's rings.

The image was taken with the narrow angle camera from a distance of approximately 770,100 kilometers (478,500 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 143 degrees. Resolution in the image is about 4 kilometers (3 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-3 12:49 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:10
The Rings Make a Point
Released: March 21, 2006

This perspective, from just beneath Saturn's ringplane, gives the rings a pointed appearance and captures a few clumps at the edge of the narrow F ring. Tethys (1,071 kilometers, 665 miles across) floats peacefully in the distance.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 12, 2006, at a distance of approximately 4.1 million kilometers (2.6 million miles) from Tethys. The image scale is 25 kilometers (16 miles) per pixel on Tethys.

[ 本帖最后由夜猫子于 2006-4-3 12:50 AM 编辑 ]

作者: 夜空 时间: 2006-4-2 23:10
In Orbit with Rhea
Released: March 17, 2006

Shadow-striped Saturn and its exquisitely thin rings occupy the near field in this Cassini view, while a crescent Rhea hangs in the distance.

A couple of bright pixels at the center of the image mark the location of tiny Pan (26 kilometers, 16 miles across). As Saturn’s second-largest moon, Rhea is 1,528 kilometers (949 miles) wide.

[ 本帖最后由夜猫子于 2006-4-3 12:51 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:10
Moons Near and Far
Released: March 16, 2006

[ 本帖最后由夜猫子于 2006-4-3 12:52 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:10
Quick Passage
Released: March 15, 2006

Mimas briefly slipped in front of Tethys while Cassini looked on and captured the event in this series of images.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 11, 2006, at a distance of approximately 3.7 million kilometers (2.3 million miles) from Mimas and 4.1 million kilometers (2.5 million miles) per pixel from Tethys. Resolution in the original image was 22 kilometers (14 miles) per pixel on Mimas (397 kilometers, 247 miles across) and 25 kilometers (16 miles) per pixel on Tethys (1,071 kilometers, 665 miles across). The images have been magnified by a factor of two.

[ 本帖最后由夜猫子于 2006-4-3 12:52 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:10
Taking a Bite Out of Tethys
Released: March 14, 2006

Dione steps in front of Tethys for a few minutes in an occultation, or mutual event. These events occur frequently for Cassini when the spacecraft is orbiting close to the ringplane.

The image was taken in visible red light with the Cassini spacecraft narrow-angle camera on Feb. 10, 2006, at a distance of approximately 3.7 million kilometers (2.3 million miles) from Dione and 4 million kilometers (2.5 million miles) from Tethys. Resolution in the original image was 22 kilometers (14 miles) per pixel on Dione (1,126 kilometers, 700 miles across) and 24 kilometers (15 miles) per pixel on Tethys (1,071 kilometers, 665 miles across). The image has been magnified by a factor of two.

[ 本帖最后由夜猫子于 2006-4-3 12:09 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
Rhea and Enceladus
Released: March 13, 2006

Rhea and Enceladus hover in the distance beyond Saturn’s ringplane. Enceladus, bathed in icy particles from Saturn's E ring, appears noticeably brighter than Rhea.

Rhea is 1,528 kilometers (949 miles) wide; Enceladus is 505 kilometers (314 miles) wide.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 8, 2006, at a distance of approximately 4.3 million kilometers (2.7 million miles) from Enceladus and 4.6 million kilometers (2.9 million miles) from Rhea. The image scale is 26 kilometers (16 miles) per pixel on Enceladus and 28 kilometers (17 miles) per pixel on Rhea.

Rhea and Enceladus徘徊在土星环平面下的远处. Enceladus,被来自土星E环的冰微粒笼罩着,与Rhea.相比,显得特别亮.

Rhea直径1,528 公里(949 英哩) ; Enceladus 直径505 公里(314 英哩)。

下图是卡西尼上的窄视角照相机用可见光在2006年2月8日,在距离Enceladus约4.3 百万公里(2.7 百万英哩) 和距离Rhea 约4.6 百万公里(2.9 百万英哩)处拍摄的。图像分辨率是在Enceladus上26 公里(16 英哩) 每象素和在Rhea上28 公里(17 英哩) 每象素。

[ 本帖最后由夜空于 2006-4-30 10:52 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
Accented Vortex

This interesting vortex in Saturn’s atmosphere is surrounded by a halo of bright clouds that extend away toward the east and west. Storms like this one seem to be bright at all wavelengths at which Cassini observes them.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 24, 2006, at a distance of approximately 2.9 million kilometers (1.8 million miles) from Saturn. The image scale is 17 kilometers (11 miles) per pixel.

引人注目的漩涡

这个在土星大气里有趣的漩涡被从东延伸到西明亮的云光晕围拢着。像这种的风暴似乎在Cassini观察它们的所有波长都很明亮。

图像采用Cassini 航天器的狭窄角度照相机在2006 年1月24日距离土星大约2 .9 百万公里 (1.8 百万英哩)以可见光拍摄. 图像标度是17 公里(11 英哩) 每像素。

[ 本帖最后由夜空于 2006-4-29 09:28 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
Spray Above Enceladus III
Released: March 9, 2006

Plumes of icy material extend above the southern polar region of Enceladus as imaged by the Cassini spacecraft in February 2005. The monochrome view is presented along with a color-coded version on the right. The latter reveals a fainter and much more extended plume component.

Images like these are being analyzed by scientists as they seek to explain the processes that could be producing such incredible features. As reported in the journal Science on March 10, 2006, imaging scientists believe that the plumes are geysers erupting from pressurized subsurface reservoirs of liquid water above 273 degrees Kelvin (0 degrees Celsius).

Another plume view, (PIA07801), was taken one month earlier and looks broadside at the moon’s prominent “tiger stripe” fractures. In the January view, the plume appears to have a single component. This (February) view looks along the tiger stripe fractures and reveals both a large and a small component to the plume; the smaller, fainter component is separated from the main plume by about 100 kilometers (60 miles).

(See PIA06247 for a view of the tiger stripe features.)

[ 本帖最后由夜猫子于 2006-4-3 12:18 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
A Pearl at Dusk
Released: March 7, 2006

Enceladus hangs like a single bright pearl against the golden-brown canvas of Saturn and its icy rings. Visible on Saturn is the region where daylight gives way to dusk. Above, the rings throw thin shadows onto the planet.

Icy Enceladus is 505 kilometers (314 miles) across.

Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were taken using the Cassini spacecraft wide-angle camera on Jan. 17, 2006 at a distance of approximately 200,000 kilometers (100,000 miles) from Enceladus. The image scale is 10 kilometers (6 miles) per pixel.

黄昏的珍珠
发布: 2006 年3月7 日

Enceladus（土卫二）像一颗孤独而明亮的珍珠在金黄棕色的土星天幕和它那冰光环之前悬挂着。土星上可见白天和黄昏的交界。上面, 光环把稀薄的阴影投影到行星上。

冰冷的Enceladus（土卫二）直径505 公里(314 英哩) 。

图像使用了红色, 绿色和蓝色光谱滤光镜分别拍摄然后再合成便创造这张自然色彩的视图。图像用Cassini太空船上的广角照相机在2006年1月17日在距离Enceladus（土卫二）大约200,000 公里(100,000 英哩)处拍摄的。图像分辨率是10 公里(6 英哩) 每象素。

[ 本帖最后由夜空于 2006-4-29 09:04 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
The Air Up There
Released: March 6, 2006

This specially processed composite view reveals a tremendous amount of structure in the northern polar atmosphere of Titan. The hazes in Titan’s atmosphere are known to extend hundreds of kilometers above the surface.

Structure visible here could be due to multiple detached hazes, or waves in the atmosphere that propagate through stably stratified layers.

Ten images taken during a brief period were processed to enhance fine detail and then were combined to create this view.

North on Titan (5,150 kilometers, 3,200 miles across) is up.

[ 本帖最后由夜猫子于 2006-4-3 12:26 AM 编辑 ]

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作者: 夜空 时间: 2006-4-2 23:11
Titan Shines Through
Released: March 3, 2006

Titan’s smoggy atmosphere glows brilliantly in scattered sunlight, creating a thin, gleaming crescent beyond Saturn’s rings. At this slight angle above the ringplane, the thin F ring shines brightly. Light from Titan’s eastern and western limbs penetrates the narrow Encke Gap.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 18, 2006, at a distance of approximately 1 million kilometers (600,000 miles) from Saturn. Planet-sized Titan (5,150 kilometers, 3,200 miles across) was 2.2 million kilometers (1.4 million miles) distant from Cassini at that time. The image scale is 13 kilometers (8 miles) per pixel on Titan.

[ 本帖最后由夜猫子于 2006-4-3 12:28 AM 编辑 ]

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作者: 夜猫子 时间: 2006-4-3 00:53
好了，夜空该你辛苦了，等翻译完了给你加分加精华！

作者: 夜猫子 时间: 2006-4-22 21:16
标题: Penelope Crater
Credit: NASA/JPL/Space Science Institute
Released: April 4, 2006 (PIA 08149)

This dramatic close-up of Tethys the large crater Penelope lying near center, overprinted by many smaller, younger impact sites.

Three smaller impact features of roughly similar size make a line left of Penelope that runs north-south: (from bottom) Ajax, Polyphemus and Phemius.

Features on Tethys are named for characters and places from “The Iliad” and “The Odyssey.” The largest impact structure on Tethys is named Odysseus. (See PIA07693 for a stunning close-up of Odysseus.)

[ 本帖最后由夜猫子于 2006-4-22 11:52 PM 编辑 ]

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作者: 夜猫子 时间: 2006-4-22 21:16
标题: Enceladus Races Onward
Credit: NASA/JPL/Space Science Institute
Released: April 5, 2006 (PIA 08150)

As our robotic emissary to Saturn, Cassini is privileged to behold such fantastic sights as this pairing of two moons beyond the rings. The bright, narrow F ring is the outermost ring structure seen here.

In this scene, bright Enceladus (505 kilometers, 314 miles across) begins to slip in front of more distant Dione (1,126 kilometers, 700 miles across). Enceladus is closer to Saturn than Dione, and orbits the planet at greater velocity. Thus, the smaller moon eventually passed the larger one, as seen from Cassini, and continued on its way.

[ 本帖最后由夜猫子于 2006-4-22 09:54 PM 编辑 ]

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作者: 夜猫子 时间: 2006-4-22 23:41
Turbulent Down South
Released: April 6, 2006 (PIA 08151)

This view of high southern latitudes on Saturn shows very linear clouds at top, usually indicative of stable prevailing winds, and two turbulent, swirling features farther south. It is possible that these features merged some time after this image was taken.

The image was taken with the Cassini spacecraft narrow-angle camera on March 6, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nanometers. The image was acquired at a distance of approximately 2.8 million kilometers (1.8 million miles) from Saturn. The image scale is 16 kilometers (10 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-22 11:49 PM 编辑 ]

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作者: 夜猫子 时间: 2006-4-22 23:47
Crescent Moon with Rings
Released: April 14, 2006 (PIA 08157)

This poetic scene shows the giant, smog-enshrouded moon Titan behind Saturn’s nearly edge-on rings. Much smaller Epimetheus (116 kilometers, 72 miles across) is just visible to the left of Titan (5,150 kilometers, 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 approximately 4.1 million kilometers (2.5 million miles) from Titan. The image scale is 25 kilometers (16 miles) per pixel on Titan. The brightness of Epimetheus was enhanced for visibility.

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作者: 夜猫子 时间: 2006-4-22 23:55
Sidelong at Saturn
Released: April 17, 2006 (PIA 08158)

Cassini looks toward the Saturnian horizon as Dione and Janus glide past.

A few craters are visible on Dione (1,126 kilometers, 700 miles across). Janus (181 kilometers, 113 miles across) is slightly blurred due to its motion during the exposure.

The rings appear essentially edge-on in this view, as Cassini continues its recent activities close to the ringplane.

The image was taken with the Cassini spacecraft narrow-angle camera on March 10, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nanometers. The image was acquired at a distance of approximately 2.9 million kilometers (1.8 million miles) from Saturn. The image scale is 17 kilometers (11 miles) per pixel.

[ 本帖最后由夜猫子于 2006-4-22 11:56 PM 编辑 ]

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作者: 夜猫子 时间: 2006-4-23 00:00
标题: A Complex Crescent
Released: April 18, 2006 (PIA 08159)

The tilted crescent of Saturn displays lacy cloud bands here along with a bright equatorial region and threadlike ring shadows on the northern hemisphere.

Three moons are visible here: Mimas (397 kilometers, 247 miles across) at left and faint, is aligned with the ringplane; at right are Rhea (1,528 kilometers, 949 miles across, at top) and Tethys (1,071 kilometers, 665 miles across, below Rhea).

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作者: 夜猫子 时间: 2006-4-23 00:03
Viewing Saturn from the Plane
Released: April 19, 2006 (PIA 08160)

This view of the ringed planet shows its tilt relative to the plane of its orbit around the Sun. The planet tilts nearly 27 degrees relative to the ecliptic plane, giving rise to seasons in which the rings shadow each hemisphere in its respective winter.

Most of the planetary bodies in the Solar System orbit near the plane of the ecliptic, since they formed along with the Sun from a spinning disk of gas and dust.

The high phase angle – the Sun-Saturn-spacecraft viewing angle, which is 116 degrees here – brings out cloud structure quite nicely.

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作者: 夜猫子 时间: 2006-4-23 00:06
标题: Worlds in Orbit
Released: April 20, 2006 (PIA 08161)

Three of Saturn’s moons are captured with the planet in this exquisite family portrait. At top, Saturn is bedecked with the shadows of its innermost rings.

Tethys (1,071 kilometers, 665 miles across) appears at lower right, closest to Cassini; Janus (181 kilometers, 113 miles across) and Mimas (397 kilometers, 247 miles across) are on the far side of the immense ringed planet. Mimas is just about to slip behind Saturn.

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作者: 夜猫子 时间: 2006-4-23 00:11
标题: Revisiting the Splat
Released: April 21, 2006 (PIA 08148)

Rhea shows off her bright, fresh-looking impact crater in this Cassini view taken during a close approach. For a high-resolution view of this crater, taken during a much closer encounter, see PIA07764.

The view is toward the leading hemisphere on Rhea (1,528 kilometers, 949 miles across). North is up.

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作者: 林中燕语 时间: 2006-4-23 08:53
看着不象木头，就象石头啊

作者: 林中燕语 时间: 2006-4-23 08:54
不过还是很不错了，beautiful

作者: bbh 时间: 2007-5-23 14:03
我有一架站在地球上就能拍出这样效果的望远镜就好了

欢迎光临天之星天文论坛(大陆著名天文论坛） (http://skyandtelescope.com.cn/bbs/)