Ӳкерчĕк:PIA08384.jpg — Википеди

# Ӳкерчĕк:PIA08384.jpg

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| This is a featured picture on Wikimedia Commons. We think it is one of the finest images on Commons; see its nomination. If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.

This image was selected as a picture of the day for December 27, 2007. It was captioned as followed:
English: Iapetus as seen by the Cassini probe.

Asturianu: Xápetu, satélite ñatural de Saturnu, adicáu dende la sonda Cassini.
Беларуская: Спадарожнік Сатурна Япет, від з КА "Касіні".
Česky: Saturnův měsíc Iapetus na fotografii sondy Huygens, Mise Cassini-Huygens
Deutsch: Iapetus, aufgenommen von der Cassini-Sonde.
English: Iapetus as seen by the Cassini probe.
Suomi: Iapetus katsottuna Cassini probesta.
Français : Japet vue par la sonde Cassini.
Magyar: A Iapetus, a Szaturnusz egyik holdja, a Cassini űrszonda felvételén hamis színezéssel (NASA/JPL/Space Science Institute)
Bahasa Indonesia: Satelit Iapetus terlihat dari pesawat ruang angkasa Cassini-Huygens.
Íslenska: Mynd af Japetusi, einu af tunglum Satúrnusar, tekin úr Cassini-Huygens-geimfarinu.
Italiano: Giapeto visto dalla sonda Cassini.
日本語: 土星探査機カッシーニが捉えた土星の衛星、イアペトゥス
‪Norsk (bokmål)‬: Iapetus, en av Saturns måner, sett fra Cassini-Huygens-sonden.
Nederlands: Iapetus, een natuurlijke maan van Saturnus, gezien door de ruimtesonde Cassini-Huygens
Polski: Iapetus widziany przez sondę Cassini.
Português: Satélite Iapetus de Saturno, vista pela sonda Cassini-Huygens.
Русский: Япет, фотография в космического аппарата «Кассини»
Српски / Srpski: Јапет, Сатурнов месец, снимљен сондом Касини.
Svenska: Saturnus måne Japetus sedd från rymdsonden Cassini-Huygens.
‪中文(简体)‬: 卡西尼—惠更斯号探测器拍摄的土卫八
‪中文(繁體)‬: 卡西尼–惠更斯號探測器拍攝的土衛八

## [edit] Summary

Description

English: Iapetus as seen by the Cassini probe.

Original NASA caption: Cassini captures the first high-resolution glimpse of the bright trailing hemisphere of Saturn's moon Iapetus.
This false-color mosaic shows the entire hemisphere of Iapetus (1,468 kilometers, or 912 miles across) visible from Cassini on the outbound leg of its encounter with the two-toned moon in Sept. 2007. The central longitude of the trailing hemisphere is 24 degrees to the left of the mosaic's center.
Also shown here is the complicated transition region between the dark leading and bright trailing hemispheres. This region, visible along the right side of the image, was observed in many of the images acquired by Cassini near closest approach during the encounter.
Revealed here for the first time in detail are the geologic structures that mark the trailing hemisphere. The region appears heavily cratered, particularly in the north and south polar regions. Near the top of the mosaic, numerous impact features visible in NASA Voyager 2 spacecraft images (acquired in 1981) are visible, including the craters Ogier and Charlemagne.
The most prominent topographic feature in this view, in the bottom half of the mosaic, is a 450-kilometer (280-mile) wide impact basin, one of at least nine such large basins on Iapetus. In fact, the basin overlaps an older, similar-sized impact basin to its southeast.
In many places, the dark material--thought to be composed of nitrogen-bearing organic compounds called cyanides, hydrated minerals and other carbonaceous minerals--appears to coat equator-facing slopes and crater floors. The distribution of this material and variations in the color of the bright material across the trailing hemisphere will be crucial clues to understanding the origin of Iapetus' peculiar bright-dark dual personality.
The view was acquired with the Cassini spacecraft narrow-angle camera on Sept. 10, 2007, at a distance of about 73,000 kilometers (45,000 miles) from Iapetus.
The color seen in this view represents an expansion of the wavelengths of the electromagnetic spectrum visible to human eyes. The intense reddish-brown hue of the dark material is far less pronounced in true color images. The use of enhanced color makes the reddish character of the dark material more visible than it would be to the naked eye.
This mosaic consists of 60 images covering 15 footprints across the surface of Iapetus. The view is an orthographic projection centered on 10.8 degrees south latitude, 246.5 degrees west longitude and has a resolution of 426 meters (0.26 miles) per pixel. An orthographic view is most like the view seen by a distant observer looking through a telescope.
At each footprint, a full resolution clear filter image was combined with half-resolution images taken with infrared, green and ultraviolet spectral filters (centered at 752, 568 and 338 nanometers, respectively) to create this full-resolution false color mosaic.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.
Français : Japet vu par la sonde Cassini.

Traduction de la légende originale fournie par la NASA: Cassini obtient la première vue à haute résolution du brillant hemisphère arrière de Japet, une lune de Saturne.
Cette image en fausses couleurs prise le 10 septembre 2007 par la sonde cassini d'une distance de 73 000 km montre tout l'hémisphere de Japet (soit 1468 km) visible depuis celle-ci. La longitude centrale de l'hémisphere arrière est à 24 degrés à gauche du centre de cette mosaique.
Cette image montr aussi la transition complexe entre les hémispheres avant (sombre) et arrière (clair). Cette région, visible sur le coté droit de l'image, a été observée de nombreuse vois lors de la rencontre entre Cassini et le satellite naturel de Saturne.
Les structure géologiques de l'hémisphere arrière de Japet sont visibles pour la premiere fois dans ce cliché. Cette région est fortement cratéerisée, en particulier pôles. En haut de l'image, de nombreux cratères d'impact déjà observés en 1981 par la sonde Voyager2 de la NASA en sont visibles comme les cratères Ogier et Charlemagne.
La structure topographique la plus importante dans cette vue est le grand (450 kilomètres de diamètre) bassin d'iumpact en bas de l'image, l'un des neuf que compte Japet. De fait, ce bassin se superpose à un plus vieux bassin de taille similaire et situé au sud ouest.
La couleur sombre de l'hémisphere avant serait due à la présence de composés organiques nitrés comme les cyanures, des minéraux hydratés et d'autres minéraux carbonatés. En plusieurs endroits, cette matière sombre semble recouvrir les survaces tournées vers l'équateur de Japet. La connaissance de la répartition de cette matière sombre, ainsi que des variations en couleur des zones claires seront capitales pour comprendre l'origine de la structure bicolore de Japet.
Les couleurs vues dans ce cliché correpondent à un spectre plus large que celui visible par l'œuil humain. Des couleurs renforcées permettent aussi de voir de façon plus nette la tonalité brunâtre qu'à l'œuil nu.
Image mosaïque en fausses couleurs assemblée à partir de 4 couches de 15 clichés chacune. ces couches correspondent a une image en lumiere blanche a pleine résolution et trois images à 752, 568 et 338 nanomètres en demi résolution. La vue est une projection orthographique centrée sur 10,8° sud et 246,5° ouest. Sa résolution est de 426 mètres par pixel.

La mission Cassini-Huygens est une mission conjointe de la NASA, de l'ESA et de l'ISA. L'orbiteur Cassini et ses caméras ont été conçus et construit au JPL à Passadena, en Californie. Le centre de traitement des images est à Boulder, au Colorado (USA).

Source | PIA08384: The Other Side of Iapetus
Date | 2007-10-08
Author | NASA/JPL/Space Science Institute
Permission (Reusing this image) | PD

| This image or video was catalogued by Jet Propulsion Lab of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA08384. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.

## [edit] Licensing

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

Languages: Deutsch | English | Español | Français | Nederlands | Português | 简体中文 | 繁體中文 | ...

Warnings:

- Use of NASA logos, insignia and emblems are restricted per US law 14 CFR 1221.
- The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not in the public domain.
- Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [1]
- All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [2]
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