Image:Io Pillan Patera comparison.jpg

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[edit] Summary

From: http://photojournal.jpl.nasa.gov/catalog/PIA00744

Original caption:

These images of Jupiter's volcanic moon, Io, show the results of a dramatic event that occurred on the fiery satellite during a five-month period. The changes, captured by the solid state imaging (CCD) system on NASA's Galileo spacecraft, occurred between the time Galileo acquired the left frame, during its seventh orbit of Jupiter, and the right frame, during its tenth orbit. A new dark spot, 400 kilometers (249 miles) in diameter, which is roughly the size of Arizona, surrounds a volcanic center named Pillan Patera. Galileo imaged a 120 kilometer (75 mile) high plume erupting from this location during its ninth orbit. Pele, which produced the larger plume deposit southwest of Pillan, also appears different than it did during the seventh orbit, perhaps due to interaction between the two large plumes. Pillan's plume deposits appear dark at all wavelengths. This color differs from the very red color associated with Pele, but is similar to the deposits of Babbar Patera, the dark feature southwest of Pele. Some apparent differences between the images are not caused by changes on Io's surface, but rather are due to differences in illumination, emission and phase angles. This is particularly apparent at Babbar Patera.

North is to the top of the images. The left frame was acquired on April 4th, 1997, while the right frame was taken on Sept. 19th, 1997. The images were obtained at ranges of 563,000 kilometers (350,000 miles) for the left image, and 505,600 kilometers (314,165 miles) for the right.

The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC.

This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL http://galileo.jpl.nasa.gov. Background information and educational context for the images can be found at URL http://www.jpl.nasa.gov/galileo/sepo.

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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)

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]
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3]

File history

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	Date/Time	Dimensions	User	Comment
current	23:59, 11 June 2007	1,124×712 (64 KB)	Volcanopele (Talk \| contribs)	(From: [http://photojournal.jpl.nasa.gov/catalog/PIA00744 http://photojournal.jpl.nasa.gov/catalog/PIA00744] Original caption: These images of Jupiter's volcanic moon, Io (moon), show the results of a dramatic event that occurred on the fiery satell)