File:Saturn's rings in visible light and radio.jpg
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This image was selected as picture of the day on Wikimedia Commons for 21 March 2008. It was captioned as follows: English: Saturn's rings in visible light and radio Other languages:
Afrikaans: Die ringe van Saturnus soos gesien deur die Cassini-Huygens ruimtetuig: bo in sigbare lig en onder met behulp van radio-aftasting Asturianu: Imaxe obtenía pola sonda Cassini-Huygens de los aniellos del planeta Saturnu. La metada superior representa una imaxe de la lluz visible. La metada inferior correspuende a una imaxe de les ondes de radio. Bosanski: Saturnovi prstenovi u vidljivom i radio dijelu spektra. Čeština: Saturnovy prstence ve viditelné a radiové oblasti spektra Deutsch: Die Ringe des Saturn in sichtbarem Licht und im Radio-Bereich English: Saturn's rings in visible light and radio Español: Imagen obtenida por la sonda Cassini-Huygens de los anillos del planeta Saturno. La mitad superior representa una imagen de la luz visible. La mitad inferior es una imagen de las ondas de radio. Euskara: Saturnoko eraztunen argazkia, Cassiny-Huygens espazio-ontziak ateratakoa. Goiko zatian argi ikusgaiean adierazita daude eta behean irrati-uhinetan. Français : Photo composée des anneaux de Saturne prise par la sonde Cassini, en lumière visible (en haut) et construite à partir d'une source radio (en bas). Galego: Os aneis de Saturno en luz visíbel e radio Hrvatski: Saturnovi prsteni kao vidljivo svjetlo i radijski signali. Íslenska: Hringir Satúrnusar á ljósmynd og litrófsmynd. Magyar: A Szaturnusz gyűrűi, felül a látható-, alul a rádióspektrumban Nederlands: De ringen van Saturnus door het oog van de Cassini-Huygens: boven met zichtbaar licht en beneden met behulp van radio-occultatie Polski: Porównanie wyglądu pierścieni Saturna w zakresie światła widzialnego i fal radiowych. Português: Imagem obtida pela sonda Cassini-Huygens dos anéis do planeta Saturno. A metade superior representa uma imagem da luz visível. A metade inferior é a uma imagem das ondas de rádio. Svenska: Saturnus ringar avbildade dels med synligt ljus (övre bildhalvan) och dels med radiostrålning (undre bildhalvan). Беларуская: Кольцы Сатурна, здымак КА "Касіні-Гюйгенс" (верх — у бачным спектры, ніз — у радыёспектры). Русский: Кольца Сатурна в видимом свете и в диапазоне радиоволн. Српски / srpski: Сатурнови прстенови виђени светлосним и радио-телескопом. 한국어: 가시광선과 라디오파로 본 토성의 고리. 日本語: 可視光と電波でみた土星の輪 中文: 土星光环 |
Summary
[edit]DescriptionSaturn's rings in visible light and radio.jpg |
English: Cassini instruments provide complementary information about the structure of Saturn's rings. Narrow and wide angle cameras provide images in the visible region of the electromagnetic spectrum much like a digital camera does. The images have information about how the ring structure differs both with distance from the planet and with position around the equatorial circle. However, resolution is usually limited to few kilometers at best.
Radio and stellar occultations of the rings also provide important information about ring structure, but only along a one-dimensional track through the rings. The radial resolution can be as fine as 50 meters (164 feet). An "image" is then constructed by assuming circular symmetry over the ring region of interest. Color is usually added to encode other information related to the observed structure. This image compares structure of Saturn's rings observed by these two approaches. The upper half is a natural color mosaic of images of the illuminated side of the rings by the Cassini narrow-angle camera (see PIA06175). The bottom simulated image is constructed from a radio occultation observation conducted on May 3, 2005. For another view created using this process, see PIA07872. Color in the lower image is used to represent information about ring particle sizes. Three simultaneous radio signals of 0.94, 3.6, and 13 centimeter wavelength (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material as a function of distance from Saturn, or an optical depth profile. This simulated image was constructed from the measured optical depth profiles. Shades of purple, primarily over most of the middle ring, the B ring, and the inner portion of the outer ring, the A ring, indicate regions where there is a lack of particles less than 5 centimeters (about 2 inches) in diameter. Green and blue shades indicate regions where there are particles of sizes smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of an inch), respectively, primarily in the outer A ring and within most of the inner ring, the C ring. The saturated broad white band near the middle of the B ring is the densest region of the rings, over which two of the three radio signals were blocked at 10-kilometer (6-mile) resolution, preventing accurate color representation. From other evidence in the radio observations, all ring regions appear to be populated by a broad range particle size distribution that extends to boulder sizes (several to many meters across). 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 was designed, developed and assembled at JPL. The radio science team is based at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.
Français : Les instruments de la sonde Cassini fournissent des information différentes et complémentaires sur la structure des anneaux de Saturne. Les appareils photo à grand angle et à longue focale font des photos d'une façon très comparable à celle d'un appareil numérique. Ces images permettent de voir la structure des anneaux à la fois en fonction de la distance à la planète et le long du plan équatorial. Cependant la résolution est limitée à quelques kilomètres.
Les ondes radio et les occultations stellaires permettent d'obtenir une bien meilleure résolution (50 mètres), mais uniquement dans le sens radial. Une image est reconstruite en supposant que les anneaux ont une symétrie radiale dans la zone considérée. De la couleur est souvent ajoutée pour donner d'autres informations sur la structure observée. 中文:土星光环 |
Date | Visible light image taken 2004-12-12; radio data acquired 2005-05-03; combined image released 2005-05-23 |
Source | http://photojournal.jpl.nasa.gov/catalog/PIA07874 |
Author | NASA / JPL / Space Science Institute |
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA07874. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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