Bestand:Iorotateing1day.ogv

Beschrijving

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PIA09257: Io in Motion
Io is the most volcanically active body in the Solar System. Volcanoes erupt massive volumes of silicate lava, sulphur and sulphur dioxide, constantly changing Io's appearance. This new basemap of Jupiter's moon Io was produced by combining the best images from both the Voyager 1 and Galileo Missions. Although the subjovian hemisphere of Io was poorly seen by Galileo, superbly detailed Voyager 1 images cover longitudes from 240 W to 40 W and the nearby southern latitudes. A monochrome mosaic of the highest resolution images from both Galileo and Voyager 1 was assembled that includes 51 Voyager 1 images with spatial resolutions sometimes exceeding the 1 km/pixel scale of the final mosaic. Because this mosaic is made up of images taken at various local times of day, care must be taken to note the solar illumination direction when deciding whether topographic features display positive or negative relief. In general, the illumination is from the west over longitudes 40 to 270 W, and from the east over longitudes 270 W to 40 W. Color information was later superimposed from Galileo low phase angle violet, green, and near-infrared (756 nanometer wavelength) images. The Galileo SSI camera's silicon CCD was sensitive to longer wavelengths than the vidicon cameras of Voyager, so that distinctions between red and yellow hues can be more easily discerned. The "true" colors that would be visible to the eye are similar but much more muted than shown here. Image resolutions range from 1 to 10 km/pixel along the equator, with the poorest coverage centered on longitude 50 W.

This mosaic is in an equal area cylindrical map projection, centered onlongitude 180, with grid lines at 30 degree intervals. Full scale versions of this mosaic, and the data products used to generate it, can be obtained from the USGS Astrogeology website, https://astrogeology.usgs.gov/Projects/JupiterSatellites/.

About the Animation

Animation file: Image:Iorotateing1day.ogg

In the same way that the Moon always has the same side facing Earth, Io always has the same side facing Jupiter. The movie shows two speeded-up rotations of Io (a single rotation really takes 1.77 days), and begins with a view of the Jupiter-facing hemisphere. With rotation in an easterly direction, after two seconds the volcano Prometheus (on the equator) comes into view. The massive red deposit around Pele (seconds 5-10) is the most distinctive expression of volcanic activity on Io, and just to the north-west is the horse shoe-shaped Loki Patera, the most powerful volcano on Io.

The animation was made using a computer program that wrapped the Io mosaic around a sphere to produce a globe. In all, 360 images were used, each differing by one degree in longitude from the previous image.

• Source: https://photojournal.jpl.nasa.gov/catalog/PIA09257 (direct link)
  Source: https://photojournal.jpl.nasa.gov/animation/PIA09257

• See also: Image:Io from Galileo and Voyager Orbiters.jpg

Licentie

	Dit bestand bevindt zich in het publiek domein, omdat het gemaakt is door de NASA. In de reproductierichtlijnen van de NASA staat dat "NASA-materiaal niet beschermd wordt door auteursrecht, tenzij anders vermeld". (NASA copyright policy page of JPL Image Use Policy).
	Waarschuwingen: Het gebruik van logo's, insignes en emblemen van de NASA wordt beperkt door de Amerikaanse wet 14 CFR 1221. Op de website van de NASA staat een groot aantal afbeeldingen van het Sovjet-/Russisch ruimteagentschap en andere niet-Amerikaanse ruimteagentschappen. Deze afbeeldingen bevinden zich niet noodzakelijk in het publieke domein. Materiaal dat gebaseerd is op gegevens van de ruimtetelescoop Hubble wordt mogelijk beschermd door auteursrecht als dit niet expliciet vervaardigd is door het STScI [1]. Zie tevens {{PD-Hubble}} en {{Cc-Hubble}} of {{Spacetelescope.org}}. Het gemeenschappelijk project van ESA en NASA betreffende de ruimtesonde SOHO suggereert dat al het materiaal dat gemaakt is door zijn ruimtesonde beschermd wordt door auteursrecht en dat toestemming vereist is voor commercieel niet-educatief gebruik. [2] Afbeeldingen op de Astronomy Picture of the Day-website (APOD) worden mogelijk beschermd door auteursrecht. [3]