PIA09360: A "Plumefall" on Io

A “Plumefall” on Io


New Horizons took this image of Jupiter's volcanic moon Io with its Long Range Reconnaissance Imager (LORRI) at 15:15 Universal Time on February 28, 2007, nearly 10 hours after the spacecraft's closest approach to Jupiter. The image is centered at Io coordinates 5 degrees south, 92 degrees west, and the spacecraft was 2.4 million kilometers (1.5 million miles) from Io. Io's diameter is 3,640 kilometers (2,262 miles).

Io's dayside was deliberately overexposed in this image to bring out details on the nightside and in any volcanic plumes that might be present. Io cooperated by producing an enormous plume, 330 kilometers (200 miles) high, from the volcano Tvashtar. Near Io's north pole, Tvashtar was active throughout New Horizons' Jupiter encounter.

In this image, volcanic debris from the plume, illuminated by the setting sun, rains down onto Io's nightside. Hot, glowing lava at the source of the plume is the bright point of light on the sunlit side of the terminator (the line separating day and night). Elsewhere along the terminator, mountains catch the setting sun. The nightside of Io is lit up by light reflected from Jupiter.

Cataloging Keywords:

Name Value Additional Values
Target Io Jupiter, Sun
System Jupiter
Target Type Satellite Planet, Sun
Mission New Horizons
Instrument Host New Horizons
Host Type Flyby Spacecraft
Instrument Long Range Reconnaissance Imager (LORRI)
Extra Keywords Grayscale, Mountain, Plume, Visual, Volcano
Acquisition Date
Release Date 2007-05-01
Date in Caption 2007-02-28
Image Credit NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute
Source photojournal.jpl.nasa.gov/catalog/PIA09360
Identifier PIA09360