PIA02549: Temperature Comparison at Loki
Target Name: Io
Is a satellite of: Jupiter
Mission: Galileo
Spacecraft: Galileo Orbiter
Instrument: Near Infrared Mapping Spectrometer
Product Size: 1060 x 767 pixels (width x height)
Produced By: Lowell Observatory
Producer ID: MRPS96243
Addition Date: 2000-05-18
Primary Data Set: Galileo EDRs
Full-Res TIFF: PIA02549.tif (291.5 kB)
Full-Res JPEG: PIA02549.jpg (133.3 kB)

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Original Caption Released with Image:

This image compares temperatures at the volcano Loki, the most powerful volcano on Io, seen by the photopolarimeter-radiometer instrument onboard NASA's Galileo spacecraft during its October 1999 flyby of Jupiter's moon Io (main image), and during its February 2000 flyby (inset). The hottest regions are within the huge, 200-kilometer (120-mile) wide caldera (the dark, horseshoe-shaped region in the image). Temperature contours are in degrees Kelvin (Kelvin): 160 K is -171 F and 320 K is +116 F. In the 4 1/2 months between the images, the hot region seen in October in the southwest part of the caldera disappeared, and the eastern part of the caldera became about 40 degrees Kelvin (70 degrees Fahrenheit) hotter. The temperature increase probably results from lava flows flooding over 10,000 square kilometers (4,000 square miles) of the caldera floor.

Additional information about the Hubble Space Telescope is available at http://www.stsci.edu/hst/. Additional information about the Galileo mission is available at http://galileo.jpl.nasa.gov.

Image Credit:
NASA/JPL/Lowell Observatory

Image Addition Date:
2000-05-18